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Letteratura scientifica selezionata sul tema "Lanthanum oxide (La2O3)"

Autore: Grafiati

Pubblicato: 16 novembre 2024

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Articoli di riviste sul tema "Lanthanum oxide (La2O3)"

Karthikeyan.S e Selvapandiyan.M. "Facile synthesis of nanoplates and nanoflower shaped La2O3 nanostructures by Reflux Route". INTERNATIONAL JOURNAL OF SCIENCE TECHNOLOGY AND HUMANITIES 2, n. 2 (30 ottobre 2015): 95–98. http://dx.doi.org/10.26524/ijsth64.

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Lanthanum Oxide (La2O3 ) nanoparticles are successfully synthesized by simple reflux method using starting materials Lanthanum Nitrate and Urea. Lanthanum Oxide (La2O3 ) have multiple applications such as gas sensors, catalyst, Hydrogen storage, catalysts, photocatalytic wet oxidation etc. This paper mainly focuses on the synthesis of Lanthanum Oxide (La2O3 ) nanoparticles at different precursor concentration at different reaction time on the properties of the synthesized Lanthanum Oxide (La2O3) nanoparticles can be explored. The synthesized samples were calcinated 500ºC for 1hr. The Lanthanum Oxide (La2O3) nanoparticles were investigated by XRD, FTIR, SEM, & UV studies. The morphology and particle size were analyzed by SEM. The structure of the crystallites was investigated using powder XRD technique. The FTIR analysis was used to examine the functional groups present in the synthesized Lanthanum Oxide (La2O3) nanoparticles. The optical band gap was calculated from the UV-Vis absorption spectra

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Karthikeyan.s, Divya.j, Selvapandiyan.M e Arumugam.J. "Synthesis of Nickel Oxide Thin Films via Sol Gel Route". INTERNATIONAL JOURNAL OF SCIENCE TECHNOLOGY AND HUMANITIES 2, n. 2 (30 ottobre 2015): 99–101. http://dx.doi.org/10.26524/ijsth65.

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Lanthanum Oxide (La2O3) nanoparticles are successfully synthesized by simple reflux method using starting materials Lanthanum Nitrate and Urea. Lanthanum Oxide (La2O3) have multiple applications such as gas sensors, catalyst, Hydrogen storage, catalysts, photocatalytic wet oxidation etc. This paper mainly focuses on the synthesis of Lanthanum Oxide (La2O3) nanoparticles at different precursor concentration at different reaction time on the properties of the synthesized Lanthanum Oxide (La2O3) nanoparticles can be explored. The synthesized samples were calcinated 500ºC for 1hr. The Lanthanum Oxide (La2O3) nanoparticles were investigated by XRD, FTIR, SEM, & UV studies. The morphology and particle size were analyzed by SEM. The structure of the crystallites was investigated using powder XRD technique. The FTIR analysis was used to examine the functional groups present in the synthesized Lanthanum Oxide (La2O3) nanoparticles. The optical band gap was calculated from the UV-Vis absorption spectra.

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Samin, Samin, Suyanti Suyanti, Susanna Tuning Sunanti e Wisnu Ari Adi. "Synthesis and Certification of Lanthanum Oxide Extracted from Monazite Sand". Indonesian Journal of Chemistry 20, n. 6 (5 ottobre 2020): 1213. http://dx.doi.org/10.22146/ijc.44327.

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Synthesis and certification of lanthanum oxide extracted from monazite sand have been carried out. This research aimed to increase the added value of monazite sand and obtain the lanthanum oxide in-house certified reference material (CRM). Synthesis of lanthanum oxide consists of several stages, namely: monazite sand digestion, rare-earth elements hydroxide [REE(OH)3] precipitation, Ce separation, Nd separation, lanthanum oxalate precipitation, and calcination. Certification of lanthanum oxide was carried out by determining the average concentration of the oxides and its uncertainty from the seven accredited laboratories by the ISO 35-2006 statistical method. Two other minerals in the lanthanum oxide analyzed by the XRD method were cerium hydroxide [Ce(OH)3] and neodymium yttrium oxide fluoride (Nd2Y2O3F16). Lanthanum oxide certified contains ten oxides, with the two highest concentrations of La2O3 (91.662 ± 0.007)% and Nd2O3 (3.949 ± 0.002)%. Lanthanum oxide has met the qualification in-house CRM since it contained water less than 1%, was homogeneous, stable, and certified. La2O3 concentration in the lanthanum oxide in-house CRM from CSAT-BATAN, Indonesia was not significantly different in comparison to that from the Department of Chemical Engineering, Srinakharinwirot University, Thailand. Lanthanum oxide extracted from monazite sand can be used as reference material in determining the lanthanum oxide quality from the pilot plant process.

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Han, Hong Jing, Yan Guang Chen, Cong Hao Xie, Dan Dan Yuan, Ying Chen e Bao Hui Wang. "Influence of La₂O₃ on NO_x Emission in Iron Ore Sintering". Advanced Materials Research 781-784 (settembre 2013): 2594–97. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2594.

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NOx emission in coke combustion with and without La2O3 was investigated in a fixed bed quartz reactor. The effects of La2O3 loading and lanthanum oxide particle size on NOx emission were discussed. NOx emission was also studied by sintering pot tests with lanthanum oxide modified coke as sintering fuel. The results showed that lanthanum oxide was catalytically active in promoting not only coke combustion but also NOx reduction. In coke combustion experiments, NOx and CO emission decreased with increasing lanthanum oxide loading up to 2.0wt% and decreasing lanthanum oxide particle size (28~150μm).

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Sun, Yunhan, Xiaoning Wang, Qingxiu Jia e Jian Yang. "Study on Organic Modification of Lanthanum Oxide". Journal of Physics: Conference Series 2194, n. 1 (1 febbraio 2022): 012032. http://dx.doi.org/10.1088/1742-6596/2194/1/012032.

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Abstract In this paper, lanthanum oxide was modified by silane coupling agent (KH560), titanate coupler NDZ-201 and dopamine hydrochloride (DP). The microstructure and chemical structure of modified La2O3 were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), and the dispersion of modified lanthanum oxide in polypropylene (PP) was investigated. The results show that the three modifiers can improve the organic properties of lanthanum oxide, and the interfacial compatibility between dopamine modified La2O3 and PP is better than the other two modifiers.

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Upolovnikova, A. G., A. A. Babenko e L. A. Smirnov. "Equilibrium content of lanthanum in metal under the slag of СаО – SiO₂ – La₂O₃ – 15 % Al₂O₃ – 8 % MgO system". Izvestiya. Ferrous Metallurgy 63, n. 11-12 (3 gennaio 2021): 946–51. http://dx.doi.org/10.17073/0368-0797-2020-11-12-946-951.

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Thermodynamic modeling results of lanthanum equilibrium content in metal under the slag of CaO – SiO2– La2О3– Al2O3– MgO system corresponding to chemical composition of 16 points of local simplex plan are presented using the HSC 8.03 Chemistry (Outokumpu) software package in combination with the simplex planning lattice method. In the work, slag is represented by CaO – SiO2– La2O3– – 15 % Al2O3– 8 % MgO oxide system in a wide range of chemical composition for temperatures of 1550 and 1650 °C, and metal contains 0.06 % C, 0.25 % Si, 0.05 % Al (in this expression and hereinafter in mass.%). The results of mathematical modeling are shown graphically in the form of composition - equilibrium content diagrams of lanthanum. There is significant effect of slag basicity on the lanthanum equilibrium content in metal. An increase in slag basicity from 2 to 5 at temperature of 1550 °C leads to an increase in the lanthanum equilibrium content from 0.2 ppm in the region of lanthanum oxide concentration of 1 – 5 % to 7 ppm in the region of increased concentration of lanthanum oxide to 4 – 7 %, hence the increase in slag basicity favorably affects development of lanthanum reduction. Increase in metal temperature also has positive effect on lanthanum reduction process. As temperature rises to 1650 °C, the lanthanum equilibrium content in metal increases from 0.2 ppm in the region of lanthanum oxide concentration of 1 – 3 % to 12 ppm in the region of increased concentration of lanthanum oxide to 4 – 7 %. In diagrams of chemical composition of slag containing 56 – 61 % CaO, 12 – 14 % SiO2and 4 – 7 % La2O3, the lanthanum content in metal at level of 7 – 12 ppm is ensured in temperature range from 1550 to 1650 °C. Therefore, there can be confirmed a decisive role of slag basicity, concentration of lanthanum oxide and temperature factor in development of lanthanum reduction from slags of the studied oxide system by aluminum dissolved in metal.

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Thermodynamic modeling results of lanthanum equilibrium content in metal under the slag of CaO – SiO2 – La2О3 – Al2O3 – MgO system corresponding to chemical composition of 16 points of local simplex plan are presented using the HSC 8.03 Chemistry (Outokumpu) software package in combination with the simplex planning lattice method. In the work, slag is represented by CaO – SiO2 – La2O3 – – 15 % Al2O3 – 8 % MgO oxide system in a wide range of chemical composition for temperatures of 1550 and 1650 °C, and metal contains 0.06 % C, 0.25 % Si, 0.05 % Al (in this expression and hereinafter in mass.%). The results of mathematical modeling are shown graphically in the form of composition - equilibrium content diagrams of lanthanum. There is significant effect of slag basicity on the lanthanum equilibrium content in metal. An increase in slag basicity from 2 to 5 at temperature of 1550 °C leads to an increase in the lanthanum equilibrium content from 0.2 ppm in the region of lanthanum oxide concentration of 1 – 5 % to 7 ppm in the region of increased concentration of lanthanum oxide to 4 – 7 %, hence the increase in slag basicity favorably affects development of lanthanum reduction. Increase in metal temperature also has positive effect on lanthanum reduction process. As temperature rises to 1650 °C, the lanthanum equilibrium content in metal increases from 0.2 ppm in the region of lanthanum oxide concentration of 1 – 3 % to 12 ppm in the region of increased concentration of lanthanum oxide to 4 – 7 %. In diagrams of chemical composition of slag containing 56 – 61 % CaO, 12 – 14 % SiO2 and 4 – 7 % La2O3 , the lanthanum content in metal at level of 7 – 12 ppm is ensured in temperature range from 1550 to 1650 °C. Therefore, there can be confirmed a decisive role of slag basicity, concentration of lanthanum oxide and temperature factor in development of lanthanum reduction from slags of the studied oxide system by aluminum dissolved in metal.

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Sun, Yunhan, Xiaoning Wang, Qingxiu Jia e Jian Yang. "Preparation of modified rare earth lanthanum oxide/polypropylene nonwoven fabric by meltblown method". Journal of Physics: Conference Series 2194, n. 1 (1 febbraio 2022): 012046. http://dx.doi.org/10.1088/1742-6596/2194/1/012046.

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Abstract Lanthanum oxide was organically modified with dopamine and blended with polypropylene, and then lanthanum oxide (La2O3)/polypropylene (PP) nonwovens were prepared by melt blown method. The nonwovens were characterized by FTIR, SEM, TG, mechanical properties and X-ray shielding. The experimental results show that the addition of modified La2O3 makes the fiber arrangement of PP nonwovens more densely arranged and improves the thermal stability of PP nonwovens. The higher the amount of La2O3, the better the X-ray shielding performance of composite nonwovens.

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Ganesh, Vanga, Thekrayat H. AlAbdulaal, Manal AlShadidi, Mai S. A. Hussien, Abdelfatteh Bouzidi, Hamed Algarni, Heba Y. Zahran et al. "Enhancement in the Structural, Electrical, Optical, and Photocatalytic Properties of La2O3-Doped ZnO Nanostructures". Materials 15, n. 19 (2 ottobre 2022): 6866. http://dx.doi.org/10.3390/ma15196866.

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A lanthanum oxide (La2O3)-ZnO nanostructured material was synthesized in the proposed study with different La2O3 concentrations, 0.001 g to 5 g (named So to S7), using the combustion method. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transformation infrared spectroscopy (FT-IR) were utilized for investigating the structure, morphology, and spectral studies of the La2O3- ZnO nanomaterials, respectively. The results obtained from previous techniques support ZnO’s growth from crystalline to nanoparticles’ fine structure by changing the concentrations of lanthanum oxide (La2O3) dopants in the host matrix. The percentage of ZnO doped with La- influences the ZnO photocatalytic activity. SEM analysis confirmed the grain size ranged between 81 and 138 nm. Furthermore, UV-Vis diffuse reflectance spectroscopy was performed to verify the effects of La2O3 dopants on the linear optical properties of the nano-composite oxides. There was a variation in the energy bandgaps of La2O3-ZnO nanocomposites, increasing the weight concentrations of lanthanum dopants. The AC electrical conductivity, dielectric properties, and current–voltage properties support the enactment of the electrical characteristics of the ZnO nanoparticles by adding La2O3. All the samples under investigation were used for photodegradation with Rhodamine B (RhB) and Methylene Blue (MB). In less than 30 min of visible light irradiation, S4 (0.5 g) La2O3-ZnO reached 99% of RhB and MB degradation activity. This study showed the best photocatalytic effect for RhB and MB degradation of 0.13 and 0.11 min−1 by 0.5 g La2O3-ZnO. Recycling was performed five times for the nanocatalysts that displayed up to 98 percent catalytic efficiency for RhB and MB degradation in 30 min. The prepared La2O3-ZnO nanostructured composites are considered novel candidates for various applications in biomedical and photocatalytic studies.

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Balusamy, Brabu, Burcu Ertit Taştan, Seyda Fikirdesici Ergen, Tamer Uyar e Turgay Tekinay. "Toxicity of lanthanum oxide (La2O3) nanoparticles in aquatic environments". Environmental Science: Processes & Impacts 17, n. 7 (2015): 1265–70. http://dx.doi.org/10.1039/c5em00035a.

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The study demonstrated the ecotoxic potential of lanthanum oxide nanoparticles on fresh-water aquatic microalgae Chlorella sp. and the crustacean Daphnia magna. Lanthanum oxide nanoparticles showed no toxic effects on algae and severe toxic effects on the crustacean. Results may play a vital role in the risk assessment process for exposure of lanthanum oxide nanoparticles in aquatic environments.

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Più fonti

Tesi sul tema "Lanthanum oxide (La2O3)"

Klettlinger, Jennifer Lindsey Suder. "Fischer-Tropsch Cobalt Catalyst Improvements with the Presence of TiO2, La2O3, and ZrO2 on an Alumina Support". University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1333981467.

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Abbadi, Meryem. "Synthèse et caractérisation de solutions solides ZnO/CeO2 et CeO2/La2O3/ZnO pour la minéralisation photocatalytique du diclofénac de sodium en solution aqueuse". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF019.

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La présence de résidus pharmaceutiques dans les milieux aquatiques est une préoccupation majeure. Parmi ceux-ci, le diclofénac de sodium est un anti-inflammatoire non stéroïdien détecté dans les eaux usées. Parmi les méthodes de traitement de ces eaux, la photocatalyse hétérogène constitue une méthode efficace et prometteuse. Comparé au TiO2, largement utilisé en photocatalyse, le ZnO est une alternative présentant une activité photocatalytique intéressante sous irradiation UV. Cependant, son activité photocatalytique est atténuée par une recombinaison de charge plus rapide et une mauvaise séparation des paires électron-trou sous irradiation visible, et sa sensibilité à la photo-corrosion limite sa capacité à minéraliser les polluants récalcitrants sous rayonnement UV-visible. Afin d'améliorer l’activité photocatalytique du ZnO dans la région visible, son association avec des espèces métalliques est très attractive. Pour cela, nous avons opté pour l’oxyde de cérium CeO2 considéré comme un bon accepteur d’électrons et un excellent support de stockage d’oxygène en dehors de sa grande stabilité thermique et sa non-toxicité. Des matériaux de la solution solide Ce1-xZnxO2-x lacunaires en oxygène ont été préparés par voie de chimie douce en présence d’acide citrique et caractérisés par diverses techniques. L'insertion du cérium génère des lacunes en oxygène et des sites actifs responsables d'une meilleure minéralisation photocatalytique du diclofénac sous la lumière visible. Ensuite, nous avons synthétisé des composés ternaires CeO2/La2O3/ZnO et leur activité photocatalytique a été évaluée sous irradiation solaire pour la dégradation du diclofénac. Les résultats ont montré que l’addition de lanthane au sein de la solution solide Ce1-xZnxO2-x permet d’améliorer d’avantage la minéralisation photocatalytique du diclofénac dans l’eau
The presence of pharmaceutical residues in aquatic environments is a major concern. Among these, diclofenac sodium is a non-steroidal anti-inflammatory drug detected in wastewater. Among the methods of water treatment, heterogeneous photo catalysis constitutes an effective and promising method. Compared to TiO2, widely used in photo catalysis, ZnO is an alternative, which presents an interesting photocatalytic activity under UV irradiation. However, its photocatalytic activity is attenuated by faster charge recombination and poor separation of electron-hole pairs under visible irradiation, and its sensitivity to photo-corrosion limits its ability to mineralize recalcitrant pollutants under UV-visible radiation. In order to improve the photocatalytic activity of ZnO in the visible region, its association with metallic species is very attractive. For this, we opted for cerium oxide CeO 2 considered a good electron acceptor and an excellent oxygen storage medium apart from its great thermal stability and non-toxicity. Ce1-xZnxO2-x materials were prepared by soft-chemistry in the presence of citric acid, and characterized by various techniques. The insertion of cerium generates oxygen vacancies and active sites responsible for better photocatalytic mineralization of diclofenac under visible light. Then, we synthesized CeO2/La2O3/ZnO ternary compounds and their photocatalytic activity was tested under solar irradiation for the degradation of diclofenac. The results showed that the addition of lanthanum to the Ce1-xZnxO2-x solid solution further improves the photocatalytic mineralization of diclofenac in water

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Blech, Vincent. "Analyse corrélée du plasma de pulvérisation et des films minces de La2O3 et de RuO2 pour les futurs transistors MOSFET". Paris 11, 2004. http://www.theses.fr/2004PA112040.

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Afin d'accroître la puissance de calcul et la rapidité des circuits intégrés, l'industrie de la micro électronique n'a cesse de miniaturiser les composants élémentaires logiques: les transistors à effet de champ (MOSFET). Cette miniaturisation conduit à une limitation fondamentale: sous 2 nm, le diélectrique de grille de SiO2 est fortement perméable aux courants tunnel. Une solution consiste à déposer des films plus épais d'un diélectrique à "forte permittivité" (e > 15). Nous avons étudié les propriétés physico-chimiques et électriques de films minces de La2O3 (e ~30) déposés par pulvérisation cathodique magnétron afin de tester les possibilités d'intégration d'un tel diélectrique dans les MOSFET. Le matériau étant fortement hygroscopique, il faut éviter tout contact avec l'air, ce qui a été réalisé en l'encapsulant sous un film mince protecteur de Ru ou de ZrO2. De plus l'utilisation de la cible de pulvérisation est également rendue complexe par l'instabilité chimique de La2O3: nous avons étudié un procédé de prépulvérisation adapté de la cible qui permet d'obtenir des films minces reproductibles. La seconde partie de cette thèse traite de l'oxyde de ruthénium RuO2, utilisé comme électrode de grille métallique pour réaliser des structures métal-isolant-semiconducteur, nécessaires à l'étude des propriétés électriques des films de La2O3. Les films minces de RuO2 étant obtenus par pulvérisation cathodique en milieu réactif (argon + oxygène), nous avons étudié le plasma (par spectroscopie d'émission optique, ou SOE) ainsi que les films minces obtenus, en fonction du débit d'oxygène. La corrélation de ces mesures permet d'une part une meilleure compréhension des mécanismes de croissance de RuO2 en pulvérisation réactive et, d'autre part, laisse envisager la possibilité d'utiliser la SOE comme un moyen de contrôle du dépôt, bon marché, en temps réel et in-situ. Enfin les caractérisations électriques des hétérostructures Si/La2O3/RuO2, encapsulées sous ZrO2, révèlent que La2O3 possède une permittivité de ~20, et qu'un film de 4. 5 nm (possédant une épaisseur équivalente de SiO2 de 3 nm) donne des courants de fuite de 10^-6 A. Cm^-2 pour une tension de grille de 1V. Enfin nous avons estimé les densités d'états électroniques et de charges fixes dans la zone interfaciale
In order to increase the calculation power and speed of integrated circuits, semiconductor industry has continuously scaled down its elementary components: the field effect transistors, so called MOSFETs. Such scaling down leads to a fundamental limitation: for a SiO2 gate dielectric thinner than 2 nm, high direct tunnel current appears to dramatically alter the behaviour of the transistor. To solve this problem, high dielectric constant (high-K, i. E. K > 15) dielectrics are needed. We studied the physical and electrical properties of La203 (K~30) thin films deposited by magnetron sputtering, in order to evaluate its compatibility with the industrial process of MOSFETs fabrication. This material is highly reactive with water molecules in air and, as a consequence, must be capped; such process could be achieved with Ru or ZrO2 cap layers. On the other hand, the use of the La2O3 sputtering target was also made complicated by its chemical instability. Thus, we studied a "pre-sputtering" process which allows obtaining reproducible thin films. The second part of this thesis is about ruthenium oxide RuO2, which was used as the metal gate electrode in metal-insulator- semiconductor structures, in order to study the electrical properties of La2O3 thin films. Since RuO2 thin films are deposited by reactive (Ar + O2) sputtering, we studied both properties of the plasma (with optical emission spectroscopy, or OES) and properties of thin films, as a function of O2 flux. The correlation of both measurements allows understanding the mechanisms of RuO2 growth in oxidizing atmosphere, as well as controlling the deposition process with OES, a non expensive, fast and in-situ technique. Moreover, the electrical characterization of Si/La2O3/RuO2 structures, capped with a ZrO2 film, show a dielectric constant of ~20 for La2O3, and leakage currents of 10^-6 A. Cm^-2 (at gate voltage = 1V) for a 4. 5 nm La2O3 film (which corresponds to an equivalent SiO2 thickness of 3 nm). To conclude, interface states density and fixed charge density in the dielectric film have also been estimated

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Capitoli di libri sul tema "Lanthanum oxide (La2O3)"

Zhao, Yi. "Hygroscopic Tolerance and Permittivity Enhancement of Lanthanum Oxide (La2O3) for High-k Gate Insulators". In High-k Gate Dielectrics for CMOS Technology, 185–223. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527646340.ch6.

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Atti di convegni sul tema "Lanthanum oxide (La2O3)"

Yushkevich, Sergey, Oksana Korniienko, Olesia Pavlenko, Olena Olifan, Anatoliy Samelyuk e Irina Subbota. "Interaction Cerium Oxide with Lanthanum and Neodium at 1500°C". In International Young Scientists Conference on Materials Science and Surface Engineering. Karpenko Physico-Mechanical Institute of the NAS of Ukraine, 2023. http://dx.doi.org/10.15407/msse2023.028.

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The phase equilibria in the ternary system CeO2–La2O3–Nd2O were systematically studied at a temperature of 1500°C, covering the entire concentration range. No new phases were identified within the specified system. An isothermal section of the phase diagram for the CeO2–LaO2–Nd2O3 ternary system was constructed. The investigation revealed the formation of solid solutions, including cubic solid solutions with a fluorite-type structure F-CeO2, as well as solid solutions based on the hexagonal (A) and cubic (C) modifications of Ln2O3. The phase fields and crystal lattice periods of the formed phases were determined for all investigated systems.

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Gao, W., C. Zhang, F. Lapostolle, H. Liao, C. Coddet e V. Ji. "Synthesis of Lanthanum Silicates with Apatite-type Structure by Atmospheric Plasma Spraying". In ITSC2007, a cura di B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima e G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0756.

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Abstract The emergence of lanthanum silicate as an electrolyte is required to accelerate the development of synthesis techniques for intermediate temperature solid oxide fuel cells (ITSOFCs). Apatite-type oxide powders of La10(SiO4)6O3 have been elaborated through atmospheric plasma spraying (APS) using micro-scale mixtures of La2O3 and SiO2 powders. Granulometer and scanning electron microscopy analyses have indicated the result of high temperature reaction and rapid solidification in the evolution of multi-scale microstructure.

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Tekeli, S., B. Aktas e S. Salman. "Synthesis and mechanical properties of lanthanum oxide (La2O3)doped 8 mol % yttria-stabilized cubic zirconia (8YSZ)". In 2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2012. http://dx.doi.org/10.1109/omee.2012.6464782.

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Karthikeyan, S., K. Dhanakodi, S. Surendhiran, P. Thirunavukkarasu, L. Arunraja e P. Manojkumar. "Structural, morphological and optical properties of pure and Yttrium (Y) doped lanthanum oxide (La2O3) nanoparticles by sonochemical method". In INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS, COMPUTING AND COMMUNICATION TECHNOLOGIES: (ICAMCCT 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0070786.

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Friedrich, C. J., R. Gadow e T. Schirmer. "Lanthane Aluminate—A New Material for Atmospheric Plasma Spraying of Advanced Thermal Barrier Coatings". In ITSC 2000, a cura di Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p1219.

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Abstract (sommario):

Abstract One of the main application fields of the thermal spraying process are thermal barrier coatings (TBC). Today partially stabilised zirconia (YSZ or MSZ) is mainly used as TBC material. At temperatures above 1000°C, zirconia layers ages distinctively including shrinkage and microcrack formation. Therefore there is a considerable interest in TBCs for higher temperature application. In this paper lanthanum aluminate, a newly developed TBC material with long term stability up to 1400 °C, is presented. It ages significantly slower at these high temperatures than commercial zirconia based TBCs. Its composition favors the formation of platelets, which prevent a densification of the coating by postsintering. It consists of La2O3, AI2O3 and MgO. Its crystal structure corresponds to lanthanum aluminate powders were produced using two different fabrication routes, one based on salts, the other one based on oxides. To optimise the granulate various raw materials and additives were tested. The slurry was spray dried in a laboratory spray drier and calcined at 1650°C. Using these two powders, coatings were produced by atmospheric plasma spraying (APS). The residual stresses of the coatings were measured by the hole drilling method and the deposition process was optimised with respect to the residual stresses of the TBC. The coatings were extensively analysed regarding phase composition, thermal expansion, long term stability as well as microstructural properties.

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