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Auteur : Grafiati
Publié le 11 mars 2023

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1

Watazu, Akira, et Tsutomu Sonoda. « Mechanical Property of Magnesium Alloy Surface with Dense Oxide ». Materials Science Forum 941 (décembre 2018) : 1827–32. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1827.

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Low Al single-phase magnesium alloy surfaces with dense magnesium oxide films were uniformly formed. The films were deposited with a radio frequency magnetron sputtering process with a planar magnetron sputtering system. The thickness of deposited magnesium oxide thin films was around 240 nm. According to the XRD results, a magnesium oxide phase film was formed on the substrate. The surface was uniform, and no cracks or exfoliation were observed. The deposited magnesium oxide film did not have any cracks or pores, and the surface of the sample was covered by magnesium oxide. The hardness of the magnesium oxide-coated magnesium alloy reached around Hv200, while that of the uncoated Mg-alloy was around Hv80. Moreover, the Vickers indenter under a 10-mN load indented the magnesium alloy substrate coated with the magnesium oxide film to a depth of around 640 nm, while that for the uncoated magnesium alloy substrate was around 620 nm. Meanwhile, the elasticity value for the magnesium alloy substrate coated with magnesium oxide film was around 5.3×1010Pa, while that of the uncoated magnesium alloy substrate was around 4.2×1010Pa.
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2

Choi, Hyungsoo, et Soontaik Hwang. « Sol-gel-derived Magnesium Oxide Precursor for Thin-film Fabrication ». Journal of Materials Research 15, no 4 (avril 2000) : 842–45. http://dx.doi.org/10.1557/jmr.2000.0120.

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Magnesium oxide (MgO) precursors were prepared by the sol-gel method using magnesium acetate. The reaction products and intermediates obtained during the sol-gel processing of magnesium acetate under various conditions were analyzed thermally and spectroscopically. No organic groups were detected by infrared spectroscopy after heat treating the reaction products at 400 °C. A large exothermic differential thermal analysis peak below 400 °C demonstrated the oxidation of organic moieties in each product. It was found that the presence of an acid catalyst was crucial during the sol-gel processing of magnesium acetate to produce sols suitable for depositing MgO films. The MgO films fabricated on Si(111) substrates using the precursor sol showed (200) orientation regardless of the presence of surface oxides on the substrates.
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3

Anuradha, B., et C. Sanjeeviraja. « Review on Magnesium Indium Oxide Thin Films : Material Properties and Preparation Techniques ». Materials Science Forum 699 (septembre 2011) : 39–66. http://dx.doi.org/10.4028/www.scientific.net/msf.699.39.

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Thin films of pure metals, alloys, semiconductors and organic compounds are indispensable tools in industry, which anticipate and recognize novel functional materials for the development of microelectronics. Thin film technology makes it possible to deposit ultra-thin functional material layers on a base substrate to form many active and passive micro-miniaturized components and devices such as solar cells, radiation sources, sensors, magnetic devices, bolometers, switching devices, photodiodes, digital versatile disk (DVD), flat panel display etc. Thus thin films play a dominant role in modern technology like opto-electronics, microelectronics etc. The study of surfaces and thin films overlaying them has been carried out for many years. But recently, it has become increasingly important in several fields of study. Thin film properties such as optical, electrical and magnetic properties are very much interested in research areas. Thin film properties are strong dependent on the method of deposition, the substrate materials, the substrate temperature, the rate of deposition, the background pressure etc. Specific application in modern technology demand tailor made film properties, for example, high optical reflection / transmission, hardness. adhesion, nonporosity, high mobility of charge carriers / insulating properties and chemical inertness, which are possible with a selection of suitable functional materials and deposition techniques. Various techniques used to deposit thin films and the material properties of MIO and its crystal structure are summarized with our results.
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Watazu, Akira, et Tsutomu Sonoda. « Deformation Property of Dense Oxide Coated Magnesium Alloy Surface ». Materials Science Forum 1016 (janvier 2021) : 1591–96. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1591.

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Dense oxide coated AZ 31 magnesium alloy surfaces were uniformly formed using a radio frequency magnetron sputtering method. The magnesium oxide thin film thickness was about 240 nm. XRD results of the film indicated that film of magnesium oxide single phase was deposited. The surface of the film was uniform and no crack was observed. The Vickers hardness measured by the nanoindenter was about Hv80 and Hv200 for the AZ31 substrate and the sample coated with the thin film, respectively. The dynamic hardness of the AZ31 substrate and the sample coated with the thin film were almost the same. In the curve at the time of pressurization, a step was observed in the sample coated with the thin film. On the other hand, many steps were observed in the data curve for the thin film deposited on the glass substrate.
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Abdullah-Hamead, Alaa Aladdin. « Advanced Structured of MgO Thin Film for Bio Applications ». Materials Science Forum 1002 (juillet 2020) : 319–30. http://dx.doi.org/10.4028/www.scientific.net/msf.1002.319.

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Extensive efforts to further promoting the Anti-Bacteria and structural properties of thin films to reach reliability and possibility of commercialization, the chemical Tri-metal oxide component was verification as Anti-Bacteria factor in this paper. Pure and mixed thin films of magnesium oxide MgO was prepared by evaporation assisted laser Nedmyum - YAG pulse Nd: YAG laser system, MgO enhanced by adding Ti and Se, at (0.5, 1, 1.5 and 2%) by weight percentage. After that, calcination is done at 400 °C for 30 min. Structural and anti-bacterial growth inspections were performed. Experimental results showed that structural properties have improved significantly with the development of a MgO thin films with tri-metal oxide; Magnesium titanium oxide Mg2TiO4 and Magnesium selenate MgSeO4 phases. Moreover, there has been an enhancement in anti-bacteria properties, which makes these thin films more reliable for protection against bacteria.
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6

Alaani, Mohammed A. Razooqi, Prakash Koirala, Adam B. Phillips, Geethika K. Liyanage, Rasha A. Awni, Dhurba R. Sapkota, Balaji Ramanujam et al. « Optical Properties of Magnesium-Zinc Oxide for Thin Film Photovoltaics ». Materials 14, no 19 (28 septembre 2021) : 5649. http://dx.doi.org/10.3390/ma14195649.

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Motivated by their utility in CdTe-based thin film photovoltaics (PV) devices, an investigation of thin films of the magnesium-zinc oxide (MgxZn1−xO or MZO) alloy system was undertaken applying spectroscopic ellipsometry (SE). Dominant wurtzite phase MZO thin films with Mg contents in the range 0 ≤ x ≤ 0.42 were deposited on room temperature soda lime glass (SLG) substrates by magnetron co-sputtering of MgO and ZnO targets followed by annealing. The complex dielectric functions ε of these films were determined and parameterized over the photon energy range from 0.73 to 6.5 eV using an analytical model consisting of two critical point (CP) oscillators. The CP parameters in this model are expressed as polynomial functions of the best fitting lowest CP energy or bandgap E0 = Eg, which in turn is a quadratic function of x. As functions of x, both the lowest energy CP broadening and the Urbach parameter show minima for x ~ 0.3, which corresponds to a bandgap of 3.65 eV. As a result, it is concluded that for this composition and bandgap, the MZO exhibits either a minimum concentration of defects in the bulk of the crystallites or a maximum in the grain size, an observation consistent with measured X-ray diffraction line broadenings. The parametric expression for ε developed here is expected to be useful in future mapping and through-the-glass SE analyses of partial and complete PV device structures incorporating MZO.
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7

Kim, Seong Jong, et Jeong Il Kim. « Effects of Current Density on the Formation of Anodic Oxide Films on AZ91 ». Materials Science Forum 510-511 (mars 2006) : 166–69. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.166.

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Magnesium must be surface treated to prevent corrosion, since it is a very active metal electrochemically. On anodizing, a compact film several tens of micrometers thick forms on magnesium, which imparts good corrosion resistance. The Mg-Al alloy (AZ91) was anodized in 1 M NaOH solution. The surface morphology of the anodized films was observed using scanning electron microscopy (SEM), energy-dispersive x-ray (EDX), and electrochemical methods. The effects of current density on the formation of anodic oxide films for a Mg-Al alloy in 1 M NaOH were investigated. In the anodic polarization curve, the reference corrosion potentials were far greater at 4-9 mA/cm2 than at 1 mA/cm2. The film that formed at 1 mA/cm2 was thin, suggesting that parts of the film had been dissolved or destroyed during the anodic polarization test. Corrosion resistance differed owing to concentric differences in current flow. Thick anodic oxide films were formed at higher applied currents.
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8

Lee, Jung-Kun, Hyun-Suk Jung, Dong-Wan Kim, Chang-Hoon Kim et Kug Sun Hong. « Influence of Substrates on the Crystal Structure of Pulsed Laser Deposited Pb(Mg1/3Nb2/3)O3–29% PbTiO3 Thin Films ». Journal of Materials Research 17, no 5 (mai 2002) : 1030–34. http://dx.doi.org/10.1557/jmr.2002.0152.

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Lead magnesium niobate–lead titanate [Pb(Mg1/3Nb2/3)O3 (PMN)–PbTiO3 (PT)] films were synthesized using pulsed laser deposition, and the effect of substrates on the deposition behavior of the PMN–PT film was investigated. Phase evolution of PMN–PT thin films was found to depend significantly on the type of the substrate used during deposition. Though a mixture of pyrochlore and perovskite was observed when films were deposited on a Pt/TiO2/SiO2/Si substrate, the oxide substrates, such as (Ba0.5Sr0.5)RuO3/Si, SrTiO3, and LaAlO3, enabled the deposition of pure perovskite. Scanning Auger microprobe, transmission electron microscope, and x-ray diffraction analysis showed that an interfacial layer between the substrates and the oxide film was central to the phase evolution behavior. On the Pt/TiO2/SiO2/Si substrate, an interfacial layer of lead–platinum (Pb–Pt) played a major role in the formation of the pyrochlore phase. However, on oxide substrates, there was no interfacial layer and interdiffusion of A-site cations was observed between the PMN film and the oxide electrodes.
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9

da Silva Almeida, Darlene Souza, Ladario da Silva, Marcela Teixeira Dalboni Garcia, José Adilson de Castro et Luciano Pessanha Moreira. « Ellipsometric Characterization of AZ31 Magnesium Alloy ». Materials Science Forum 930 (septembre 2018) : 478–83. http://dx.doi.org/10.4028/www.scientific.net/msf.930.478.

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Ellipsometry is a non-destructive and indirect technique able to characterize both optical and dielectric properties of thin films and bulks, besides determining the thickness of thin films. This characterization is performed by evaluating the change in the polarization state of the incident light when it interacts with the material of interest. In this work, the ellipsometry technique was used to characterize optical properties of AZ31 magnesium alloy samples. This alloy has several interesting properties such as low density, high thermal conductivity, good machinability, among others, which makes it suitable for use in automotive and aerospace components. However, when this alloy is exposed to ambient atmosphere, it undergoes natural oxidation, developing a surface film of oxides and/or hydroxides. This study aimed to establish an efficient methodology for accessing the optical and dielectric characteristics of the substrate (AZ31 alloy) as well as those for the surface film of oxide/hydroxides, and to obtain the thickness of this film. Four samples mechanically grinded and polished were investigated: One sample, namely P sample, was subjected to the ellipsometric measurements immediately after grinding and polishing and three samples, namely A10, A50 and A60, were exposed to the air at 150°C during 10, 50 e 60 minutes, respectively. From the results of the ellipsometric measurements for P sample, it was possible to determine the refractive index (n) and extinction coefficient (k) curves as a function of the wavelength (λ) for the substrate (AZ31 alloy). Besides, through appropriate modeling, it was possible to determine the thicknesses of the oxides/hydroxides films presented in A10, A50 and A60 samples. The thicknesses values obtained seem to be quite coherent when we analyze the surface roughness of these samples using the confocal microscope, validating the optical model constructed to represent the A10, A50 and A60 samples. The results achieved in this study can contribute to the study of both of oxides/hydroxides layers growth and protective coating films growth for AZ31 magnesium alloy.
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10

Mohd Wahid, Mohamad Hafiz, Rozana Mohd Dahan, Siti Zaleha Sa'ad, Adillah Nurashikin Arshad, Muhamad Naiman Sarip, Habibah Zulkefle et Mohamad Rusop Mahmood. « Surface Morphologies of PVDF-TrFE/MgO Nanocomposite Thin Films and its Effect on the Ferroelectric Properties ». Advanced Materials Research 1134 (décembre 2015) : 6–11. http://dx.doi.org/10.4028/www.scientific.net/amr.1134.6.

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The enhancement of ferroelectric and dielectric properties of PVDF-TrFE by incorporating various percentages of Magnesium Oxide (1 – 7%) for spin coated nanocomposite thin film was demonstrated. Observations showed uniform distribution and low agglomeration of MgO in the PVDF-TrFE nanocomposite thin film, especially for 3% MgO. Additionally, the 3% MgO incorporated into PVDF-TrFE had generated the highest Pr (88 mC/m2) and dielectric constant (13.6) in comparison other percentage compositions. However, the addition of more than 3% MgO filler loading caused a reduction in the ferroelectric and dielectric properties of the nanocomposite thin films.
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11

Pan, Yaru, Xihui Liang, Zhihao Liang, Rihui Yao, Honglong Ning, Jinyao Zhong, Nanhong Chen, Tian Qiu, Xiaoqin Wei et Junbiao Peng. « Application of Solution Method to Prepare High Performance Multicomponent Oxide Thin Films ». Membranes 12, no 7 (22 juin 2022) : 641. http://dx.doi.org/10.3390/membranes12070641.

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Capacitors play an increasingly important role in hybrid integrated circuits, while the MIM capacitors with high capacitance density and small thickness can meet the needs of high integration. Generally speaking, the films prepared with a single metal oxide dielectric often achieve a breakthrough in one aspect of performance, but dielectric layers are required to be improved to get better performance in leakage current, capacitance density, and transmittance simultaneously in modern electronic devices. Therefore, we optimized the performance of the dielectric layers by using multiple metal oxides. We combined zirconia, yttria, magnesium oxide, alumina, and hafnium oxide with the solution method to find the best combination of these five metal oxides. The physical properties of the multi-component films were measured by atomic force microscopy (AFM), ultraviolet-visible spectrophotometer, and other instruments. The results show that the films prepared by multi-component metal oxides have good transmittance and low roughness. The thicknesses of all films in our experiment are less than 100 nm. Then, metal–insulator–metal (MIM) devices were fabricated. In addition, we characterized the electrical properties of MIM devices. We find that multi-component oxide films can achieve good performances in several aspects. The aluminum-magnesium-yttrium-zirconium-oxide (AMYZOx) group of 0.6 M has the lowest leakage current density, which is 5.03 × 10−8 A/cm2 @ 1.0 MV/cm. The hafnium-magnesium-yttrium-zirconium-oxide (HMYZOx) group of 0.8 M has a maximum capacitance density of 208 nF/cm2. The films with a small thickness and a high capacitance density are very conducive to high integration. Therefore, we believe that multi-component films have potential in the process of dielectric layers and great application prospects in highly integrated electronic devices.
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12

Hebard, A. F., A. T. Fiory, S. Nakahara et R. H. Eick. « Oxygen‐rich polycrystalline magnesium oxide—A high quality thin‐film dielectric ». Applied Physics Letters 48, no 8 (24 février 1986) : 520–22. http://dx.doi.org/10.1063/1.96493.

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13

Zhao, Wei Min, Zhong Fang Shi, Zhi Feng Wang, Yong Yan Li, Jian Ding, Bo Young Hur et Rui Zhao. « Effect of Rare-Earth Elements on the Ignition-Proof Behavior of Industrial Pure Magnesium ». Materials Science Forum 654-656 (juin 2010) : 1464–67. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.1464.

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The purpose of this research is to investigate effect of rare-earth elements (Y and Dy) on industrial pure Mg through the ignition point test and oxide film analysis. The results show that the 0.5%Y can make the ignition point of pure magnesium about 30°C higher. However, the ignition point of pure magnesium can be multiplied about 50°C by the mixed additions of 0.5wt%Y and 5wt%Dy. The SEM analysis indicates the oxide film of Mg-0.5Y-5Dy is more compact and tenacious than that of Mg-0.5Y. The XRD analysis indicates that the oxide film of Mg-0.5Y-5Dy consists of MgO, Y2O3 and Dy2O3. The most of all the three oxides are Dy2O3, which can prevent magnesium from further oxidizing.
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Jiang, Guixia, Ao Liu, Guoxia Liu, Chundan Zhu, You Meng, Byoungchul Shin, Elvira Fortunato, Rodrigo Martins et Fukai Shan. « Solution-processed high-k magnesium oxide dielectrics for low-voltage oxide thin-film transistors ». Applied Physics Letters 109, no 18 (31 octobre 2016) : 183508. http://dx.doi.org/10.1063/1.4966897.

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15

Yang, Huiyun, Zhihao Liang, Xiao Fu, Zhuohui Xu, Honglong Ning, Xianzhe Liu, Jiajing Lin, Yaru Pan, Rihui Yao et Junbiao Peng. « Application of Amorphous Zirconium-Yttrium-Aluminum-Magnesium-Oxide Thin Film with a High Relative Dielectric Constant Prepared by Spin-Coating ». Membranes 11, no 8 (10 août 2021) : 608. http://dx.doi.org/10.3390/membranes11080608.

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Amorphous metal oxide has been a popular choice for thin film material in recent years due to its high uniformity. The dielectric layer is one of the core materials of the thin film transistor (TFT), and it affects the ability of charges storage in TFT. There is a conflict between a high relative dielectric constant and a wide band gap, so we solved this problem by using multiple metals to increase the entropy of the system. In this paper, we prepared zirconium-yttrium-aluminum-magnesium-oxide (ZYAMO) dielectric layers with a high relative dielectric constant using the solution method. The basic properties of ZYAMO films were measured by an atomic force microscope (AFM), an ultraviolet-visible spectrophotometer (UV-VIS), etc. It was observed that ZYAMO thin films had a larger optical band when the annealing temperature increased. Then, metal-insulator-metal (MIM) devices were fabricated to measure the electrical properties. We found that the leakage current density of the device is relatively lower and the ZYAMO thin film had a higher relative dielectric constant as the concentration went up. Finally, it reached a high relative dielectric constant of 56.09, while the leakage current density was no higher than 1.63 × 10−6 A/cm2@ 0.5 MV/cm at 1.0 M and 400 °C. Therefore, the amorphous ZYAMO thin films has a great application in the field of high permittivity request devices in the future.
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Li, Jun Gang, Ying Lv, Mu Qin Li, Zun Jie Wei et Xiang Cai Meng. « Formation of the Surface Oxide Film on as-Cast Mg-7Li Alloy ». Advanced Materials Research 239-242 (mai 2011) : 1082–87. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1082.

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The excellent properties of Mg-Li alloys make them suitable light fabrication materials used extensively in many applications. The microstructure and the surface oxide film at different temperature of as-cast Mg-7Li alloy were investigated by optical microscope(OM), scanning electron microscopy(SEM), X-ray diffraction(XRD) and electronic analytical balance. Results showed that Mg-7Li alloy was composed of mainly α phase and β phase. With increasing temperature, the morphology of the alloy surface varied from the formation of a very thin oxide film, large amounts of oxide particles to the thick and coarse film with a mass of cellular protuberances in size of 40-80μm. The ratio of oxidation weight gains rose from 0.08% to 11.58%. The surface oxide film consisted of mainly magnesium oxide(MgO) phase and lithium peroxide(Li2O2) phase, resulting from the reaction of oxygen with Mg and Li. The volume of the oxides on β phase greater than that on α phase led to the formation of cellular protuberance on the surface of Mg-7Li alloy at high temperature.
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Choi, Young-Wook, et Jee-Hyun Kim. « Sputtering Technique of Magnesium Oxide Thin Film for Plasma Display Panel Applications ». Journal of Electrical Engineering and Technology 1, no 1 (1 mars 2006) : 110–13. http://dx.doi.org/10.5370/jeet.2006.1.1.110.

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Ide-Ektessabi, Ari, Hiroshi Nomura, Nobuto Yasui et Yuji Tsukuda. « Ion beam-assisted deposition of magnesium oxide thin film for PDP applications ». Surface and Coatings Technology 163-164 (janvier 2003) : 728–33. http://dx.doi.org/10.1016/s0257-8972(02)00695-3.

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Choi, Young Wook, et Jeehyun Kim. « Reactive sputtering of magnesium oxide thin film for plasma display panel applications ». Thin Solid Films 460, no 1-2 (juillet 2004) : 295–99. http://dx.doi.org/10.1016/j.tsf.2004.01.066.

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20

Zhao Yang, Haifeng Pu, Can Cui, Li Zhang, Chengyuan Dong et Qun Zhang. « Solution-Processed Indium–Zinc-Oxide Thin Film Transistors With High-$k$ Magnesium Titanium Oxide Dielectric ». IEEE Electron Device Letters 35, no 5 (mai 2014) : 557–59. http://dx.doi.org/10.1109/led.2014.2311117.

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21

Vereecken, Philippe M., et Genis Vanheusden. « (Invited) Electrochemically Induced Deposition of Thin-Film Oxides and Electronic Insulators ». ECS Meeting Abstracts MA2022-01, no 23 (7 juillet 2022) : 1129. http://dx.doi.org/10.1149/ma2022-01231129mtgabs.

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Electrodeposition is typically associated with the electroreduction of metal ions for the deposition of metals, alloys or semiconductors. Compounds can be electrodeposited when the metal ions form an insoluble compound upon change of its valence state at the electrode surface. A well-known example is the anodic deposition of MnO2, where aqueous solvated Mn2+ ions are oxidized to the insoluble Mn(IV) in acid sulfate solutions. Alternatively, the precipitation of a compound or oxide can be triggered by changing the local pH at the electrode by a suitable electrochemical reaction. The use of electrochemical formed base from so-called probase molecules has found applications in formation of oxides, phosphates but also organic materials such metal organic frameworks (MOFs). Nitrate was one of the first pro-bases suggested for the electrochemical precipitation of ZnO. An alternate electrochemical approach for depositing compounds and oxides is the electrochemical initiation of a sol-gel reaction first developed for the silica sol-gel process by Shacham et al. [1] During deposition, an electrode is submerged into a precursor solution followed by the application of a cathodic current. The chemical reaction is triggered by electro-generating the OH- catalyst that is required for the polycondensation of the silica precursor. Since this occurs near the surface, the method results in silica thin films deposited only on the electrode surface. Finally, also electro-polymerization can lead to thin insulating films. In this paper, several of these reaction paths will be explored. The initial stages of MnO2 electrodeposition are strongly dependent on the starting surface and determines the adhesion and attainable film thickness [2]. The relationship between (intentionally) introduced meso-porosity, growth rate and film thickness will be discussed. The poor electronic conductivity of oxides makes that the reaction is maintained by ionic conduction through the films, similar as for oxide formation by anodization. For the formation of micron thick oxide films, also good control of hydrodynamic conditions is essential. [3] The resistive nature of the layers typically allows also for good conformality over high aspect ratio substrates. Conformal deposition of oxide thin-film coatings on high aspect ratio structures is typically claimed by Atomic Layer Deposition. Inorganic-organic hybrid films such as metal cones can be similarly deposited by Molecular Layer Deposition (MLD). [4] The nature of the surface limited reactions of these vapor-phase methods allows for the formation of continuous sub-nanometer to a few tens of nanometer thin films with uniform thickness over the most complex architectures. The accuracy of the technique goes at the cost of long deposition cycles especially when very large surface areas with extreme aspect ratios (>100) are involved. The intrinsic resistive nature of the electrodeposited oxide and insulator films allows for excellent conformal coatings with growth rates much more suited for thicker films without loss in conformality or uniformity. In this paper, we will show examples where electrochemical induced deposition process are used also to coat nano-architectures such as our nanomesh with very large surface area (100 cm2 per planar cm2) and aspect ratio (100x). [1] Shacham, B. R., Avnir, D. & Mandler, D. Electrodeposition of Methylated Sol-Gel Films on Conducting Surfaces. Adv. Mater. 384–388 (1999). [2] "Electrodeposition of Adherent Submicron to Micron Thick Manganese Dioxide Films with Optimized Current Collector Interface for 3D Li-Ion Electrodes" Marina Timmermans, Nouha Labyedh, Felix Mattelaer, Stanislaw Zankowski, Stella Deheryan, Christophe Detavernier, and Philippe M. Vereecken, J. Electrochem. Soc. 164, 14, D954-D963 (2017). [3] Aggregate-Free Micrometer-Thick Mesoporous Silica Thin Films on Planar and Three-Dimensional Structured Electrodes by Hydrodynamic Diffusion Layer Control during Electrochemically Assisted Self-Assembly”, G Vanheusden, H Philipsen, SJF Herregods, PM Vereecken, Chemistry of Materials (2021). [4] “Molecular Layer Deposition of "Magnesicone", a Magnesium-based Hybrid Material" Jeroen Kint, Felix Mattelaer, Sofie S. T. Vandenbroucke, Arbresha Muriqi, Matthias M. Minjauw, Mikko Nisula, Philippe M. Vereecken, Michael Nolan, Jolien Dendooven, and Christophe Detavernier, Chem. Mater. 32, 11, 4451–4466, (2020).
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Mohamed, Ruziana, Zuraida Khusaimi, A. N. Afaah, Aadila Aziz, N. A. M. Asib, A. K. Shafura, Kevin Alvin Eswar et al. « Influence of Annealing on the Morphological and Optical Properties of Mg Doped ZnO Thin Film ». Advanced Materials Research 1109 (juin 2015) : 539–43. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.539.

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Sol gel immersion method has been used to synthesize magnesium doped zinc oxide (Mg:ZnO) thin film on glass substrate. The morphological of annealed thin film was study using atomic force microscopy (AFM) while UV-Visible spectroscopy was used to examine the optical transmittance properties. The optical band gap was estimated by using Tauc’s method. From the results, the surface roughness was change as annealing temperature increases. The increasing of annealing temperature also affects the transmittance spectra which are shifted to lower wavelength. The optical band gaps of the thin film were varied due to different annealed temperature.
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Huang, Chunfa, Zhiguo Liu et Jianguo Li. « Evolution Behavior of the Surface Oxide Film of Al Alloy Scraps in the Melt ». Metals 13, no 3 (3 mars 2023) : 510. http://dx.doi.org/10.3390/met13030510.

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The oxide film on the scrap surface is one of the primary sources of oxide inclusions in the aluminum melt. Understanding the evolution of the oxide films in the aluminum melt is an important step for developing efficient recycling technologies and controlling the quality of the product. In the present study, we studied the evolution behavior of the oxide film in the aluminum melt. The oxide films were introduced via aluminum alloy scraps into the melt, and the micro-morphology and composition of the oxide film were analyzed by scanning electron microscope and energy spectrum. Results show that the oxide film on the surface of 1235 alloy foil, A356 alloy turning, and 5083 alloy scalping were broken into small flake oxide film and then transformed into minor granular oxide when the scraps were charged into commercial purity aluminum melt. However, in aluminum alloy melt containing magnesium, the oxide film remained an intact sheet shape up to a certain melt dwelling time.
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Cui, Naiyuan, Fei Wang et Lei Guo. « Ti-doped MgO thin film by magnetron sputtering for cesium frequency standard ». International Journal of Modern Physics B 33, no 19 (30 juillet 2019) : 1950202. http://dx.doi.org/10.1142/s0217979219502023.

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The main component of magnetically selected cesium frequency standard is electron multiplier. Its working principle is to magnify cesium beam signal by emitting secondary electron through surface of material. Magnesium oxide (MgO) has been adopted due to its excellent capability to emit secondary electron. There are many ways to prepare MgO thin film, including evaporation, pulsed laser deposition and MOCVD. It has been studied that doping can be used to enhance its emission capability and decrease its working potential of the thin film. In this paper, Ti-doped MgO thin films were deposited by magnetron sputtering method. Titanium metal and MgO ceramic were co-sputtered in oxygen containing argon ambient with DC and RF power source, respectively. XRD results show that the deposited film has the texture of (100) and (110) orientation. The ratio of Ti/Mg were consistent in XPS and EDS. SEM and AFM show that the film is polycrystalline. Electron multiplier device was assembled, and the secondary electron emission coefficient of the Ti-doped MgO film is greater than that of the undoped one, especially 36% higher at low primary electron energy of 200 eV which is meaningful to cesium atomic frequency standard.
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Gheisi, Amir, Andreas Sternig, Günther J. Redhammer et Oliver Diwald. « Thin water films and magnesium hydroxide fiber growth ». RSC Advances 5, no 100 (2015) : 82564–69. http://dx.doi.org/10.1039/c5ra18202f.

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Rackham, Jonathan C., Bin Zou et Michelle A. Moram. « Towards Two-Dimensional Oxides for Optoelectronic Applications ». MRS Advances 3, no 3 (2018) : 147–51. http://dx.doi.org/10.1557/adv.2018.219.

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ABSTRACTPreliminary thin films of barium zirconate-titanate (BZT) are grown by pulsed laser deposition from bulk ceramic targets on magnesium oxide (001) substrates. Growth conditions are optimized for film crystallinity and thick (100 nm) films are deposited. These films are seen to be growing with a cube-on-cube epitaxial relation. The lattice constant of the alloy follows Vegard’s law as expected but shows a reasonable amount of non-linearity in the relation between band gap and composition.
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Chang, Li Min, Dan Dan Xu et Wei Liu. « Preparation and Characterisation of CaP-Containing Coating on Magnesium Alloy by Micro-Arc Oxidation and Hydrothermal Treatment ». Advanced Materials Research 496 (mars 2012) : 383–86. http://dx.doi.org/10.4028/www.scientific.net/amr.496.383.

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Micro-arc oxidation (MAO) together with hydrothermal treatment had been performed to improve the corrosion resistance of magnesium alloy. The oxide films were hydrothermally heated at 150°C for 2h. The morphology of samples were characterized by SEM/EDS. The phase compositions were examined by TF-XRD. The corrosion resistance of the coatings was evaluated by electrochemical methods in Hank’s solution. The MAO films displayed porous and rough structure and were mainly composed of MgO and MgAl2O4. After hydrothermal treatment, a dicalcium phosphate dihydrate (DCPD) coating formed on the oxide film. The corrosion resistance of the MAO film and DCPD coating was increased by about 12 and 40 times higher than that of bare magnesium alloy.
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Arshad, Adillah Nurashikin, Rozana Mohd Dahan, Mohamad Hafiz Mohd Wahid, Zulkefle Habibah, Nyl Ismail Lyly, Muhamad Naiman Sarip et Rusop Mahmood Mohamad. « The Study of the Surface Morphology of PVDF/MgO Nanocomposites Thin Films ». Advanced Materials Research 626 (décembre 2012) : 311–16. http://dx.doi.org/10.4028/www.scientific.net/amr.626.311.

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This study investigates the effect of varying loading percentages of MgO on the topography and morphology of Poly (vinylideneflouride)/Magnesium Oxide (PVDF/MgO) nanocomposites thin films. PVDF/MgO nanocomposites spin coated thin films with thicknesses ranging from 200nm to 456nm were successfully characterized. The nanocomposite solutions were spin coated on Al-glass substrates at 1500rpm. The topography and surface roughness of PVDF/MgO nanocomposites were characterized by using AFM. FE-SEM was used to investigate the surface morphology of the nanocomposites thin films and ATR-FTIR was used to determine the chemical bonding of PVDF/MgO nanocomposites. MgO (7%) was found to be the optimum loading percentage for PVDF/MgO nanocomposite film with favorable distribution of MgO particles, minimum defects and high content of β-phase as evident by FESEM and FTIR.
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Sinha, Mangalika, Mukul Gupta, Philippe Jonnard et Mohammed H. Modi. « Soft X-ray characterization of ion beam sputtered magnesium oxide (MgO) thin film ». Surface and Interface Analysis 50, no 11 (10 mai 2018) : 1145–48. http://dx.doi.org/10.1002/sia.6446.

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Chen, Ze Min, Pin Lu et Qiu Hong Dong. « Study of Micro-Arc Oxidation Process in Magnesium Surface ». Applied Mechanics and Materials 190-191 (juillet 2012) : 595–98. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.595.

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This study selected sodium silicate, sodium fluoride, glycerol hydroxyl acid, potassium hydroxide and phosphine oxide (LAP) as the stabilizer electrolyte, and then on micro-arc oxidation of magnesium with constant current density. The microstructure, corrosion resistance, chemical composition, structure and characterization of micro-arc oxidation film were determined by SEM and anodic oxidation methods. Experimental results indicated that the test pieces of magnesium would formed an silver-gray uniform densification oxide film on the surface by micro-arc oxidation treatment, and the corrosion resistance of magnesium film-formed had increased by potentiodynamic polarization curve testing.
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Carta, Giovanni, Rosalba Gerbasi, Gilberto Rossetto, Pierino Zanella, Marco Natali, Marco Bolzan et Omar Saoncella. « MOCVD of magnesium titanium oxide thin films using an unusual magnesium precursor ». Surface and Coatings Technology 201, no 22-23 (septembre 2007) : 9117–19. http://dx.doi.org/10.1016/j.surfcoat.2007.03.053.

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Guo, Xiaomei, Yingyin K. Zou, Kewen K. Li, Qiushui Chen et Hua Jiang. « Formation of multiferroic thin-film heterostructure (BiAl:YIG/La:PMNT) via a wet chemical process ». Journal of Materials Research 22, no 8 (août 2007) : 2125–29. http://dx.doi.org/10.1557/jmr.2007.0266.

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A novel multiferroic thin-film heterostructure exhibiting both ferromagnetic (FM) and ferroelectric (FE) properties, as well as magneto-optic (MO) and electro-optic (EO) properties, was fabricated via a wet chemical route. Oxide buffer layers were used to allow the growth of ferroelectric lanthanum modified lead magnesium niobate titanate (La:PMNT) layer on top of ferromagnetic bismuth and aluminum substituted yttrium iron garnet (BiAl:YIG). X-ray diffractometer (XRD) analysis confirmed the formation of both crystalline structures. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to examine the surface and cross-section morphologies of the resulted heterostructure. Multiferroic properties of the film were investigated.
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Irie, K., Shoji Ishibashi, Toshiyuki Nishimura, Hidetoshi Fujii, S. Muraji, Y. Shima et H. Hasuyama. « Formation of Magnesium Oxide Thin Films by Reactive Sputtering ». Key Engineering Materials 159-160 (mai 1998) : 299–304. http://dx.doi.org/10.4028/www.scientific.net/kem.159-160.299.

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Diachenko, O. V., A. S. Opanasuyk, D. I. Kurbatov, S. S. Patel, R. R. Desai, D. Lakshminarayana, C. J. Panchal et Priya Suryavanshi. « Structure and Substructure Properties of Magnesium Oxide Thin Films ». Invertis Journal of Science & ; Technology 9, no 2 (2016) : 72. http://dx.doi.org/10.5958/2454-762x.2016.00002.0.

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Arnold, T., A. Barbour, S. Chanaa, R. E. Cook, D. Fernandez-Canato, P. Landry, T. Seydel, P. Yaron et J. Z. Larese. « Melting of thin films of alkanes on magnesium oxide ». European Physical Journal Special Topics 167, no 1 (février 2009) : 143–50. http://dx.doi.org/10.1140/epjst/e2009-00950-7.

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Das, P. S., A. Dey, A. K. Mandal, N. Dey et A. K. Mukhopadhyay. « Growth of dip coated magnesium oxide nanoflower thin films ». Surface Engineering 32, no 1 (22 juillet 2015) : 15–20. http://dx.doi.org/10.1179/1743294415y.0000000082.

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Lu, Dongzhu, Yanliang Huang, Jizhou Duan et Baorong Hou. « A Zinc-Rich Coating Fabricated on a Magnesium Alloy by Oxide Reduction ». Coatings 9, no 4 (25 avril 2019) : 278. http://dx.doi.org/10.3390/coatings9040278.

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The corrosion resistance of magnesium alloys could be enhanced by covering metallic coatings on the surface. The zinc-rich coating is one of these metallic coatings. To fabricate a zinc-rich coating on magnesium alloys, the substrate should be pretreated carefully, and a protective atmosphere is usually required. In this research, a zinc-rich coating was successfully fabricated on the AZ91D magnesium alloy in air by a diffusion alloying method, with zinc oxide as the zinc source. At the same time, the pretreatment of the magnesium alloy matrix was greatly simplified. The as-diffusion-alloyed zinc-rich intermetallic layer was investigated, utilizing SEM, EDS, and XRD, respectively. It is inferred that zinc oxide was reduced into Zn atoms by the active Mg atoms, and the Mg atoms were coming from the magnesium alloy matrix. Then the Zn atoms passed through the oxide film and formed an intermetallic layer on the magnesium alloy surface. Thus, taking advantage of the activity of Mg atoms, magnesium alloys could be surface alloyed with oxides.
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Yoo, Dong Youn, Eugene Chong, Do Hyung Kim, Byeong Kwon Ju et Sang Yeol Lee. « Effect of magnesium oxide passivation on the performance of amorphous indium–gallium–zinc-oxide thin film transistors ». Thin Solid Films 520, no 10 (mars 2012) : 3783–86. http://dx.doi.org/10.1016/j.tsf.2011.10.065.

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Tlili, Maher, Chayma Nefzi, Badriyah Alhalaili, Chaker Bouzidi, Lassaad Ajili, Neila Jebbari, Ruxandra Vidu et Najoua Turki Kamoun. « Synthesis and Characterization of MgO Thin Films Obtained by Spray Technique for Optoelectronic Applications ». Nanomaterials 11, no 11 (15 novembre 2021) : 3076. http://dx.doi.org/10.3390/nano11113076.

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Magnesium oxide (MgO) thin films with different magnesium concentrations ([Mg2+] = 0.05, 0.1, 0.15 and 0.2 mol·L−1) in a spray solution have been successfully grown using a spray pyrolysis technique. X-ray diffraction (XRD), Maud software, FTIR spectroscopy, a confocal microscope, Wien2k software, spectrophotometry and a Photoluminescence spectrometer were used to investigate the structural, morphological and optical properties. XRD analysis revealed a better crystalline quality of the MgO thin layer synthesized with [Mg2+] = 0.15 mol·L−1, which crystallized into a face-centered cubic structure along the preferred orientation (200) lattice plan. The enhancement of the crystalline quality for the MgO thin film ([Mg2+] = 0.15 mol·L−1) was obtained, which was accompanied by an increment of 94.3 nm of the crystallite size. No secondary phase was detected and the purity phase of the MgO thin film was confirmed using Maud software. From the transmission spectra results, high transparent and antireflective properties of the MgO thin film were observed, with an average transmission value of about 91.48% in the visible range, which can be used as an optical window or buffer layer in solar cell applications. The films also have a high reflectance value in the IR range, which indicates that the highly reflective surface will prevent an increase in surface temperature under solar irradiation, which could be beneficial in solar cell applications. A direct band gap type was estimated using the Tauc relation which is close to the experimental value of 4.0 eV for optimal growth. The MgO material was tested for the degradation of methylene blue (MB), which reached a high photodegradation rate of about 83% after 180 min under sunlight illumination. These experimental trends open a new door for promising the removal of water contaminants for photocatalysis application.
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Ding, Jian, Zheng Fang, Lin Qin et Wei Min Zhao. « Effect of Re Addition on the Ignition Resistance of Pure Magnesium ». Materials Science Forum 788 (avril 2014) : 88–92. http://dx.doi.org/10.4028/www.scientific.net/msf.788.88.

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This paper focus on the effect of rare earth elements addition on the oxidation resistance of pure magnesium. The results show that the ignition points of the Mg-RE alloys vary like “V” along with the increase of the rare earth elements. When the content of Y reaches 10wt%, the ignition point of magnesium alloy is 890K, about 40K higher than the ignition point of pure magnesium. After the addition of rare earth elements, dense oxide film forms on the surface of Mg-RE alloys. The outer oxidation film mainly consists of rare earth oxide.
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41

Yang, Chih-Chiang, Kuan-Yu Chen, Wei-Sheng Yeh, Yan-Kuin Su et Zi-Hao Wang. « Ultraviolet Photodetection Application in Magnesium Indium Oxide Thin Film Transistors via Co-Sputtering Deposition ». Applied Sciences 10, no 15 (26 juillet 2020) : 5128. http://dx.doi.org/10.3390/app10155128.

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A magnesium-doped indium oxide (In2O3:Mg) ultraviolet (UV) thin film phototransistor was fabricated via cosputtering of MgO and In2O3. Three samples with different sputtering power values of In2O3 ranging from 40 to 60 W, namely, sample A with 40 W, sample B with 50 W, and sample C with 60 W, were used in this study. Results confirmed that oxygen vacancy concentration evidently indicates indium content. The experimental results showed that responsivities of samples, defined as the ratio of photocurrent under illumination per input power, increase from 0.0086 to 2.6 A/W. Rejection ratios were 1.2 × 104, 4.3 × 105, and 4.8 × 105 for samples A, B, and C, respectively. Based on our results, sample C is the best among the three MgInO UV phototransistors investigated in this study.
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42

Jeon, In Young, Ji Yoon Lee et Dae Ho Yoon. « Electrical Properties of Magnesium Incorporated Zinc Tin Oxide Thin Film Transistors by Solution Process ». Journal of Nanoscience and Nanotechnology 13, no 3 (1 mars 2013) : 1741–45. http://dx.doi.org/10.1166/jnn.2013.6710.

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Maruyama, Toshiro, et Jun Shionoya. « Magnesium Oxide Thin Films Prepared by Chemical Vapor Deposition from Magnesium 2-Ethylhexanoate ». Japanese Journal of Applied Physics 29, Part 2, No. 5 (20 mai 1990) : L810—L811. http://dx.doi.org/10.1143/jjap.29.l810.

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Bendahmane, Bouteina, Milena Tomić, Nour El Houda Touidjen, Isabel Gràcia, Stella Vallejos et Farida Mansour. « Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films ». Sensors 20, no 7 (10 avril 2020) : 2158. http://dx.doi.org/10.3390/s20072158.

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This work presents the effect of magnesium (Mg) doping on the sensing properties of tin dioxide (SnO2) thin films. Mg-doped SnO2 films were prepared via a spray pyrolysis method using three doping concentrations (0.8 at.%, 1.2 at.%, and 1.6 at.%) and the sensing responses were obtained at a comparatively low operating temperature (160 °C) compared to other gas sensitive materials in the literature. The morphological, structural and chemical composition analysis of the doped films show local lattice disorders and a proportional decrease in the average crystallite size as the Mg-doping level increases. These results also indicate an excess of Mg (in the samples prepared with 1.6 at.% of magnesium) which causes the formation of a secondary magnesium oxide phase. The films are tested towards three volatile organic compounds (VOCs), including ethanol, acetone, and toluene. The gas sensing tests show an enhancement of the sensing properties to these vapors as the Mg-doping level rises. This improvement is particularly observed for ethanol and, thus, the gas sensing analysis is focused on this analyte. Results to 80 ppm of ethanol, for instance, show that the response of the 1.6 at.% Mg-doped SnO2 film is four times higher and 90 s faster than that of the 0.8 at.% Mg-doped SnO2 film. This enhancement is attributed to the Mg-incorporation into the SnO2 cell and to the formation of MgO within the film. These two factors maximize the electrical resistance change in the gas adsorption stage, and thus, raise ethanol sensitivity.
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45

Vladoiu, R., A. Mandes, V. Dinca et G. Prodan. « Titanium-based thin films for protective coatings prepared by TVA (Thermionic Vacuum Arc) technology ». MATEC Web of Conferences 249 (2018) : 01005. http://dx.doi.org/10.1051/matecconf/201824901005.

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The aim of the present work is to achieve the controlled synthesis of Ti and Mg thin films, with compact structure and extremely smooth surface, by using the Thermionic Vacuum Arc (TVA) technology, from elemental powder of titanium and magnesium. The thin film exhibits an amorphous structure, with polycrystalline grain mainly being Mg hexagonal phase and small amount of hexagonal Ti. Grain mean size was estimated to be ~120nm by statistical analysis of measured Feret diameter of projected area of grain. The phases were tested by mean of Cohen method applied to electron diffraction results. No oxide (MgO, TiO2,) lines could be identified from electron diffraction. Debye-Scherrer dimension, estimated from electron diffraction profile is ~4 nm. The analysis of amorphous part from diffraction profile show different coordination number for Mg and Ti atoms.
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Tanji, T., N. Aoyama, K. Yamamoto et T. Hirayama. « Lorentz microscopy of magnetic fine particles ». Microscopy and Microanalysis 5, S2 (août 1999) : 30–31. http://dx.doi.org/10.1017/s1431927600013477.

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Magnetic granular films, which consist of magnetic fine particles of nanometer size and a nonmagnetic matrix, have been of great interest for new magnetic materials. Their magnetic characteristics strongly depend on the fine structures, besides the combination of magnetic and nonmagnetic constituents, especially their surface topology and the particles size. Although the relationship between these fine topological structures and the macro-magnetic characteristics has been investigated systematically by many researchers, there has remained a desire to observe magnetic microstructures directly. We succeeded in observing the magnetic structure of fine particles in granular films using Lorentz microscopy.Two kinds of specimens were observed. One was an Fe-Mo granular film. An amorphous film of Fe-Mo was prepared by dc magnetron sputtering on amorphous carbon thin films at a temperature below 180 K. The films were annealed at 770 K within an in-plane magnetic field. The other kind was an Fe-MgO granular film, where iron particles were embedded in a magnesium oxide single crystal.
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Ferri, Kevin, Saiphaneendra Bachu, Wanlin Zhu, Mario Imperatore, John Hayden, Nasim Alem, Noel Giebink, Susan Trolier-McKinstry et Jon-Paul Maria. « Ferroelectrics everywhere : Ferroelectricity in magnesium substituted zinc oxide thin films ». Journal of Applied Physics 130, no 4 (28 juillet 2021) : 044101. http://dx.doi.org/10.1063/5.0053755.

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Yaron, Peter N., Mark T. F. Telling et J. Z. Larese. « Thermodynamic Investigation ofn-Hexane Thin Films Adsorbed on Magnesium Oxide ». Langmuir 22, no 17 (août 2006) : 7203–7. http://dx.doi.org/10.1021/la060996c.

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49

Luzanov, V. A. « Growth Features of Thin Epitaxial Magnesium Oxide Films on Sapphire ». Journal of Communications Technology and Electronics 64, no 7 (juillet 2019) : 720–21. http://dx.doi.org/10.1134/s1064226919070118.

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Foster, Michelle, Melinda Furse et Devon Passno. « An FTIR study of water thin films on magnesium oxide ». Surface Science 502-503 (avril 2002) : 102–8. http://dx.doi.org/10.1016/s0039-6028(01)01906-9.

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