Relevant bibliographies by topics / Multiferroic Oxides - Dielectric Properties

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Academic literature on the topic 'Multiferroic Oxides - Dielectric Properties'

Author: Grafiati
Published: 7 September 2023

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Journal articles on the topic "Multiferroic Oxides - Dielectric Properties"

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Zhao, Li, Maria Teresa Fernández-Díaz, Liu Hao Tjeng, and Alexander C. Komarek. "Oxyhalides: A new class of high-TC multiferroic materials." Science Advances 2, no. 5 (2016): e1600353. http://dx.doi.org/10.1126/sciadv.1600353.

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Magnetoelectric multiferroics have attracted enormous attention in the past years because of their high potential for applications in electronic devices, which arises from the intrinsic coupling between magnetic and ferroelectric ordering parameters. The initial finding in TbMnO3 has triggered the search for other multiferroics with higher ordering temperatures and strong magnetoelectric coupling for applications. To date, spin-driven multiferroicity is found mainly in oxides, as well as in a few halogenides. We report multiferroic properties for synthetic melanothallite Cu2OCl2, which is the first discovery of multiferroicity in a transition metal oxyhalide. Measurements of pyrocurrent and the dielectric constant in Cu2OCl2 reveal ferroelectricity below the Néel temperature of ~70 K. Thus, melanothallite belongs to a new class of multiferroic materials with an exceptionally high critical temperature. Powder neutron diffraction measurements reveal an incommensurate magnetic structure below TN, and all magnetic reflections can be indexed with a propagation vector [0.827(7), 0, 0], thus discarding the claimed pyrochlore-like “all-in–all-out” spin structure for Cu2OCl2, and indicating that this transition metal oxyhalide is, indeed, a spin-induced multiferroic material.
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Liu, Sheng, Feng Xiang, Yulan Cheng, Yajun Luo, and Jing Sun. "Multiferroic and Magnetodielectric Effects in Multiferroic Pr2FeAlO6 Double Perovskite." Nanomaterials 12, no. 17 (2022): 3011. http://dx.doi.org/10.3390/nano12173011.

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Single-phase multiferroics that allow the coexistence of ferroelectric and magnetic ordering above room temperature are highly desirable, and offer a fundamental platform for novel functionality. In this work, a double perovskite multiferroic Pr2FeAlO6 ceramic is prepared using a sol-gel process followed by a quenching treatment. The well-crystallized and purified Pr2FeAlO6 in trigonal structure with space group R3c is confirmed. A combination of the ferroelectric (2Pr = 0.84 μC/cm2, Ec = 7.78 kV/cm at an applied electric field of 20 kV/cm) and magnetic (2Mr = 433 memu/g, Hc = 3.3 kOe at an applied magnetic field of 1.0 T) hysteresis loops reveals the room-temperature multiferroic properties. Further, the magnetoelectric effect is observed from the measurements of magnetically induced dielectric response and polarization. The present results suggest a new complex oxide candidate for room-temperature multiferroic applications.
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Díaz-Moreno, Carlos A., Jorge A. López, Yu Ding, A. Hurtado Macias, Chunqiang Li, and Ryan B. Wicker. "Multiferroic and Optical Properties of La0.05Li0.85NbO3 and LiNbO3 Nanocrystals." Journal of Nanotechnology 2018 (September 3, 2018): 1–13. http://dx.doi.org/10.1155/2018/3721095.

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The chemistry and physics of surfaces is an increasingly important subject. The study of surfaces is the key of many important nanotechnological applications due to the understanding of phase transitions, electronic structure, and chemical bonding. In later years, exotic phenomena that jointly involve the magnetic and electrical conductivity properties have been discovered in oxides that contain magnetic ions. Moreover, the uses of magnetic oxides in electronic technology have become so important due to the miniaturization of devices and magnetic materials with dielectric properties or vice versa being required for inductors, information storage, thin films for high-density computer memories, microwave antireflection coatings, and permanent magnets for automobile ignitions among others. On the contrary, nanotechnology developments over 10 years or so have provided intensive studies in trying to combine properties such as ferroelectric, ferromagnetic, and optics in one single-phase nanoparticles or in composite thin films; this last effort has been recently known as multiferroic. Because of this, the resurgence of nanomaterials with multiferroic and optical properties is presented in this work of one single phase in lanthanum lithium niobate (La0.05Li0.85NbO3) and lithium niobate (LiNbO3) with ferromagnetic, ferroelectric, relaxor ferroelectricity, second harmonic generation, high-temperature ferromagnetic, and magnetoelectric properties.
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Skulski, Ryszard, Dariusz Bochenek, Przemysław Niemiec, Dagmara Brzezinska, and Artur Chrobak. "Technology and Main Properties of PMN-PT-Ferrite Multiferroic Ceramic Composite Materials." Advances in Science and Technology 98 (October 2016): 3–8. http://dx.doi.org/10.4028/www.scientific.net/ast.98.3.

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In the presented work composite ferroelectric/ferrimagnetic ceramics have been obtained and described. The investigated material is based on PMN-PT powders and Ni-Zn ferrite powder. The Powders of ferroelectric component (i.e. (1–x)PMN-(x)PT with x from 0.25 to 0.40 with step 0.03 were synthesized using the sol-gel method. The magnetic component i.e. nickel-zinc ferrite was obtained from oxides using the classic method of obtaining ceramics. The compositions of PMN–PT used by us have rhombohedral or tetragonal symmetries, or belong to morphotropic region. The final ceramic composite samples were obtained using the classic method of ceramic technology with calcination route and final pressureless densification using free sintering. In this paper, XRD, EDS dielectric and magnetic properties have been investigated and described for the obtained composite ceramic samples.
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Dash, Swagatika, R. N. P. Choudhary, Piyush R. Das, and Ashok Kumar. "Structural, dielectric, and multiferroic properties of (Bi0.5K0.5)(Fe0.5Nb0.5)O3." Canadian Journal of Physics 93, no. 7 (2015): 738–44. http://dx.doi.org/10.1139/cjp-2014-0025.

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A polycrystalline sample of (Bi0.5K0.5)(Fe0.5Nb0.5)O3 was prepared using a mixed oxide at 1000 °C. The preliminary structural analysis using X-ray diffraction data of the compound indicates the formation of a single-phase rhombohedral structure similar to that of parent BiFeO3. Microstructural and elemental analysis using a scanning electron micrograph and energy-dispersive X-ray spectroscopy, respectively, were carried out at room temperature with higher magnification exhibiting a uniform distribution of grains and stoichiometry. The appearance of hysteresis loops (P–E) confirms the existence of ferroelectricity of the sample with a high remnant polarization of (2Pr) 17.76 μCcm−2. Using impedance spectroscopy, the electrical properties of the material were investigated at a wide range of temperature (25–500 °C) and frequencies (1 kHz – 1 MHz) suggesting dielectric non-Debye-type relaxation in the material. The nature of the Nyquist plot ([Formula: see text] ∼ [Formula: see text]) shows the dominance of the grain contribution in the impedance. The bulk resistance of the compound decreases with increasing temperature, like that of a semiconductor, which shows a negative temperature coefficient of resistance (NTCR) behavior. The frequency dependence of AC conductivity suggests that that the material obeys Jonscher’s power law. Magnetic hysteresis (M–H) loop shows very weak ferromagnetic behavior at room temperature.
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Pattanayak, Samita, R. N. P. Choudhary, and Piyush R. Das. "Studies of electrical conductivity and magnetic properties of Bi1-xGdxFeO3 multiferroics." Journal of Advanced Dielectrics 04, no. 02 (2014): 1450011. http://dx.doi.org/10.1142/s2010135x14500118.

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The polycrystalline samples of Bi 1-x Gd x FeO 3 (x = 0, 0.1, and 0.2) multiferroic oxides have been synthesized by a solid-state reaction/mixed oxide technique. The preliminary X-ray structural analysis with room temperature diffraction data confirmed the formation of single-phase systems. Study of room temperature scanning electron micrograph (SEM) of the surface of the above samples exhibits a uniform distribution of plate- and rod-shaped grains throughout the sample surface with less porosity. The dielectric behavior of the materials was studied in a wide range of frequency (1 kHz–1 MHz) and temperature (30–400°C). The nature of temperature dependence of dc conductivity confirms the Arrhenius behavior of the materials. The frequency–temperature dependence of ac conductivity suggests that the material obeys Jonscher's universal power law. An increase in Gd -content results in the enhancement of spontaneous magnetization BiFeO 3 (BFO) due to the collapse of spin cycloid structure. The magnetoelectric coupling coefficient of BFO has been enhanced on Gd -substitution.
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Zhou, Ziyao, Qu Yang, Ming Liu, et al. "Antiferroelectric Materials, Applications and Recent Progress on Multiferroic Heterostructures." SPIN 05, no. 01 (2015): 1530001. http://dx.doi.org/10.1142/s2010324715300017.

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Antiferroelectric (AFE) materials with adjacent dipoles oriented in antiparallel directions have a double polarization hysteresis loops. An electric field (E-field)-induced AFE–ferroelectric (FE) phase transition takes place in such materials, leading to a large lattice strain and energy change. The high dielectric constant and the distinct phase transition in AFE materials provide great opportunities for the realization of energy storage devices like super-capacitors and energy conversion devices such as AFE MEMS applications. Lots of work has been done in this field since 60–70 s. Recently, the strain tuning of the spin, charge and orbital orderings and their interactions in complex oxides and multiferroic heterostructures have received great attention. In these systems, a single control parameter of lattice strain is used to control lattice–spin, lattice–phonon, and lattice–charge interactions and tailor properties or create a transition between distinct magnetic/electronic phases. Due to the large strain/stress arising from the phase transition, AFE materials are great candidates for integrating with ferromagnetic (FM) materials to realize in situ manipulation of magnetism and lattice-ordered parameters by voltage. In this paper, we introduce the AFE material and it's applications shortly and then review the recent progress in AFEs based on multiferroic heterostructures. These new multiferroic materials could pave a new way towards next generation light, compact, fast and energy efficient voltage tunable RF/microwave, spintronic and memory devices promising approaches to in situ manipulation of lattice-coupled order parameters is to grow epitaxial oxide films on FE/ferroelastic substrates.
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Moustafa, A. M., S. A. Gad, G. M. Turky, and L. M. Salah. "Structural, Magnetic, and Dielectric Spectroscopy Investigations of Multiferroic Composite Based on Perovskite–Spinel Approach." ECS Journal of Solid State Science and Technology 11, no. 3 (2022): 033008. http://dx.doi.org/10.1149/2162-8777/ac5c7d.

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Multiferroic composite materials with the nominal composition (La0.8Gd0.2FeO3)1−x(Mn0.5Cu0.5Fe2O4)x, x = 0.0≤x≤1 were prepared using the co-precipition method. XRD, FTIR and Raman were utilized to investigate the structure phase, microstructural characteristics, vibrational bands. The optical properties were analyzed; the VSM was used to investigate the magnetic properties of the composites. Broadband dielectric spectroscopy is employed to investigate the dielectric and electrical performance of the prepared multiferroic composites. Rietveld refinement of the XRD patterns confirmed the orthorhombic phase for lanthanum gadolinium iron oxide (La0.8Gd0.2FeO3) and cubic phase for manganese copper ferrite (Mn0.5Cu0.5Fe2O4). The crystallite size of LGFO phase pointed out that it increases with increasing the MCFO phase, while the microstrain found to decline. The FTIR results elucidated the tetrahedral and octahedral bands. The deduced optical properties revealed that the samples have optical energy gap in the range 4.18 −4.5 eV. The magnetic properties revealed that the composites exhibit typical ferromagnetic hysteresis loops, indicating the presence of ordered magnetic structure. The frequency dependence of permittivity ε′(f) and real part of complex conductivity, σ′(f) exhibits a development of a net of micro-capacitors like behavior that stores charge carriers.
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Algueró, Miguel, Rafael P. del Real, Harvey Amorín, and Alicia Castro. "Coexisting magnetic orders and concomitant Morin-like transition and relaxor behavior in multiferroic Aurivillius Bi4Ti3 − 2xNbxFexO12 compounds." Applied Physics Letters 121, no. 12 (2022): 122904. http://dx.doi.org/10.1063/5.0097079.

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Aurivillius layered oxides with general formula (Bi2O2)(Am−1BmO3m+1) stand out among room-temperature magnetoelectric multiferroics for their large magnetization. However, despite extensive research, there is an obvious lack of understanding of their magnetism. The chemical design strategy for obtaining multiferroism involves the incorporation of M3+ magnetic cations at the B-site of well-known ferroelectric compounds such as Bi4Ti3O12 (m = 3). We report here a study of the magnetism and dielectric properties of Aurivillius Bi4Ti3 − 2xNbxFexO12 phases with x ≥ 1 up to 1.2, which correspond to magnetic cation fractions at the B site between 0.33 and 0.4 above the threshold for percolation. This is a three-layer system, less prone to the formation of intergrowths, which nominally contains Fe3+ as single magnetic species. Despite that, a rich phenomenology is uncovered. Coexisting magnetic orders are present in the Aurivillius compounds, and a Morin-like transition takes place at low temperatures. The dielectric characterization does not show any associated anomaly that could indicate a polymorphic phase transition but the appearance of relaxor-like characteristics. Possible scenarios are discussed, which involve the presence of Fe2+, cation partitioning between nonequivalent B-sites, and the development of polar nanodomains within a ferroelectric phase at a spin reorientation transition.
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Zhang, Xiao Yan, Xi Wei Qi, Jian Quan Qi, and Xuan Wang. "Preparation and Properties of Multiferroic La-Doped BiFeO3 Thin Film." Advanced Materials Research 486 (March 2012): 417–21. http://dx.doi.org/10.4028/www.scientific.net/amr.486.417.

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Multiferroic La-doped Bi1-xLaxFeO3 thin films were prepared on conductive indium tin oxide (ITO)/glass substrates through a simple sol-gel process. The crystal structure of La-doped Bi1-xLaxFeO3 thin films annealed at different temperature was determined to be rhombohedral of R3m space and free of secondary phases. The grain size of La-doped BiFeO3 thin films tends to become larger and the grain boundary is gradually ambiguous compared to pure BiFeO3. The double remanent polarization 2Pr of Bi0.9La0.1FeO3 thin film annealed at 500°C is 6.66 µC/cm2, which is slightly improved than that of pure BiFeO3 thin film. With the increase of La-doping levels, the dielectric constant is increased and the dielectric loss is obviously decreased.
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Dissertations / Theses on the topic "Multiferroic Oxides - Dielectric Properties"

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Rotaru, Andrei. "Novel polar dielectrics with the tetragonal tungsten bronze structure." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/4184.

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There is great interest in the development of new polar dielectric ceramics and multiferroic materials with new and improved properties. A family of tetragonal tungsten bronze (TTB) relaxors of composition Ba₆M³⁺Nb₉O₃₀ (M³⁺ = Ga³⁺, Sc³⁺ and In³⁺, and also their solid solutions) were studied in an attempt to understand their dielectric properties to enable design of novel polar TTB materials. A combination of electrical measurements (dielectric and impedance spectroscopy) and powder diffraction (X-ray and neutron) studies as a function of temperature was employed for characterising the dynamic dipole response in these materials. The effect of B-site doping on fundamental dipolar relaxation parameters were investigated by independently fitting the dielectric permittivity to the Vogel-Fulcher (VF) model, and the dielectric loss to Universal Dielectric Response (UDR) and Arrhenius models. These studies showed an increase in the characteristic dipole freezing temperature (T[subscript(f)]) with increase B-cation radius. Crystallographic data indicated a corresponding maximum in tetragonal strain at T[subscript(f)], consistent with the slowing and eventual freezing of dipoles. In addition, the B1 crystallographic site was shown to be most active in terms of the dipolar response. A more in-depth analysis of the relaxor behaviour of these materials revealed that, with the stepwise increase in the ionic radius of the M³⁺ cation on the B-site within the Sc-In solid solution series, the Vogel-Fulcher curves (lnf vs. T[subscript(m)]) are displaced to higher temperatures, while the degree of relaxor behaviour (frequency dependence) increases. Unfortunately, additional features appear in the dielectric spectroscopy data, dramatically affecting the Vogel-Fulcher fitting parameters. A parametric study of the reproducibility of acquisition and analysis of dielectric data was therefore carried out. The applicability of the Vogel-Fulcher expression to fit dielectric permittivity data was investigated, from the simple unrestricted (“free”) fit to a wider range of imposed values for the VF relaxation parameters that fit with high accuracy the experimental data. The reproducibility of the dielectric data and the relaxation parameters obtained by VF fitting were shown to be highly sensitive to the thermal history of samples and also the conditions during dielectric data acquisition (i.e., heating/cooling rate). In contrast, UDR analysis of the dielectric loss data provided far more reproducible results, and to an extent was able to partially deconvolute the additional relaxation processes present in these materials. The exact nature of these additional relaxations is not yet fully understood. It was concluded application of the Vogel-Fulcher model should be undertaken with great care. The UDR model may represent a feasible alternative to the evaluation of fundamental relaxation parameters, and a step forward towards the understanding of the dielectric processes in tetragonal tungsten bronzes.
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Kolodiazhnyi, Taras Petric Anthony. "Semiconducting and dielectric properties of barium titanates, tantalates and niobates with perovskite structure /." *McMaster only, 2002.

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Baeraky, Thoria A. "High temperature measurements of the microwave dielectric properties of ceramics." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323185.

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Podpirka, Adrian Alexander. "Studies on Synthesis, Structural and Electrical Properties of Complex Oxide Thin Films: Ba1-xSrxTiO3 and La2-xSrxNiO4." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10247.

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High performance miniaturized passives are of great importance for advanced nanoelectronic packages for several applications including efficient power delivery. Low cost thin film capacitors fabricated directly on package (and/or on-chip) are an attractive approach towards realizing such devices. This thesis aims to explore fundamental frequency dependent dielectric and insulating properties of thin film high-k dielectric constant in the perovskite and perovskite-related complex oxides. Throughout this thesis, we have successfully observed the role of structure, strain and oxygen stoichiometry on the dielectric properties of thin film complex oxides, allowing a greater understanding of processing conditions and polarization mechanisms. In the first section of the thesis, we explore novel processing methods in the conventional ferroelectric, barium strontium titanate, \(Ba_{1-x}Sr_xTiO_3 (BST)\), using ultraviolet enhanced oxidation techniques in order to achieve improvements in the dielectric properties. Using this method, we also explore the growth of BST on inexpensive non-noble metals such as Ni which presents technical challenges due to the ability to oxidize at high temperatures. We observe a significant lowering of the dielectric loss while also lowering the process temperature which allows us to maintain an intimate interface between the dielectric layer and the metal electrode. The second section of this thesis explores the novel dielectric material, Lanthanum Strontium Nickelate, \(La_{2-x}Sr_xNiO_4 (LSNO)\), which exhibits a colossal dielectric response. For the first time, we report on the colossal dielectric properties of polycrystalline and epitaxial thin film LSNO. We observe a significant polarization dependence on the microstructure due to the grain/grain boundary interaction with charged carriers. We next grew epitaxial films on various insulating oxide substrates in order to decouple the grain boundary interaction. Here we observed substrate dependent dielectric properties associated with induced strain. We also observe, due to the p-type carriers in LSNO, pn junction formation when grown epitaxially on the conducting oxide degenerate n-type Nb-doped \(SrTiO_3\). Finally we explore the growth mechanism of epitaxial LSNO as a function of high oxygen content. Due to the ability for LSNO to take in interstitial oxygen, a reoriented growth is observed at a critical thickness, thereby allowing us to vary anisotropy as a function of deposition conditions.<br>Engineering and Applied Sciences
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Bright, Trevor James. "Infrared properties of dielectric thin films and near-field radiation for energy conversion." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50364.

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Studies of the radiative properties of thin films and near-field radiation transfer in layered structures are important for applications in energy, near-field imaging, coherent thermal emission, and aerospace thermal management. A comprehensive study is performed on the optical constants of dielectric tantalum pentoxide (Ta₂O₅) and hafnium oxide (HfO₂) thin films from visible to the far infrared using spectroscopic methods. These materials have broad applications in metallo-dielectric multilayers, anti-reflection coatings, and coherent emitters based on photonic crystal structures, especially at high temperatures since both materials have melting points above 2000 K. The dielectric functions of HfO₂ and Ta₂O₅ obtained from this work may facilitate future design of devices with these materials. A parametric study of near-field TPV performance using a backside reflecting mirror is also performed. Currently proposed near-field TPV devices have been shown to have increased power throughput compared to their far-field counterparts, but whose conversion efficiencies are lower than desired. This is due to their low quantum efficiency caused by recombination of minority carriers and the waste of sub-bandgap radiation. The efficiency may be improved by adding a gold mirror as well as by reducing the surface recombination velocity, as demonstrated in this thesis. The analysis of the near-field TPV and proposed methods may facilitate the development or high-efficiency energy harvesting devices. Many near-field devices may eventually utilize metallo-dielectric structures which exhibit unique properties such as negative refraction due to their hyperbolic isofrequency contour. These metamaterials are also called indefinite materials because of their ability to support propagating waves with large lateral wavevectors, which can result in enhanced near-field radiative heat transfer. The energy streamlines in such structures are studied for the first time. Energy streamlines illustrate the flow of energy through a structure when the fields are evanescent and energy propagation is not ray like. The energy streamlines through two semi-infinite uniaxially anisotropic effective medium structures, separated by a small vacuum gap, are modeled using the Green’s function. The lateral shift and penetration depth are calculated from the streamlines and shown to be relatively large compared to the vacuum gap dimension. The study of energy streamlines in hyperbolic metamaterials helps understand the near-field energy propagation on a fundamental level.
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Zhang, Yan. "Theoretical study of the transition-metal oxides Pb2FeMoO6 and ZrO2." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112209.

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Ces dernières années, les oxydes de métaux de transition ont suscité de grands intérêts du point de vue fondamental et technologique. A cet égard, nous nous concentrons sur deux types d'oxydes : le première, le Perovskite double Pb2FeMoO6, avec un potentiel d'application sur des appareils magnétorésistances et spintroniques ; le deuxième, la zircone ZrO2 avec de excellentes propriétés mécaniques et diélectriques pour être utilisée dans les domaines de matériaux structuraux et fonctionnels. Dans la présente étude, nous utilisons la méthode ab-initio (first-principles calculation) pour étudier les détails des orbites décomposés des structures électroniques et des propriétés magnétiques du Pb2FeMoO6 massif de structure parfaite, massif avec des défauts et en structure de plaque. En même temps, les détails des orbites décomposés des structures électroniques, les propriétés mécaniques, dynamiques et diélectriques de six phases de la ZrO2 (cubique, tétragonale, monoclinique, orthorhombique I (Pbca), orthorhombique II (Pnma) et (Pca21)) ont également été étudiés. D'abord nous allons faire les calculs ab-initio sur les propriétés structurales, électroniques et magnétiques de double pérovskite Pb2FeMoO6 massif avec structure parfaite, massif avec défauts et en structure de plaque. La densité des états orbitaux décomposés montre le champ cristallin octaédrique des six atomes d'oxygène autour de métal de transition (des Fe ou des Mo) et divise les cinq états dégénérés des atomes libres de Fe ou Mo dans un états triplement dégénéré t2g (dxy, dyz et dzx) avec une énergie plus faible et dans un états doublement dégénéré eg (dz2 et dx2-y2) avec une énergie plus élevée. La nature semi-métalliques et les propriétés de transport complètes (100%) de spin de polarisation de Pb2FeMoO6 massif et en structures de plaque reflètent un grand potentiel d’application dans les dispositifs magnéto-résistifs et spintroniques. Le caractère semi-métallique est maintenu pour le composé Pb2FeMoO6 désordonné contenant d’antisites Fe(Mo), de lacunes de VFe, VO ou VPb, alors qu'il disparaît quand les antisites Mo(Fe), les échanges entre Fe-Mo ou les lacunes de VMo sont présents même la concentration de défauts est réduite jusqu'à C = 6,25%. Ainsi, les antisites Mo(Fe), les échanges entre Fe-Mo ou les lacunes de VMo doivent être évités afin de préserver le caractère semi-métallique du composé Pb2FeMoO6 et donc être utilisables dans des dispositifs magnéto-résistifs et spintroniques.Ensuite, basé sur la rigidité élastique constantes individuelle calculée Cij de six phases de ZrO2, les propriétés élastiques et mécaniques des agrégats polycristallins ont été prédits. Nous avons donc examiné le caractère isolant de la phase cubique/tétragonale de ZrO2 sous forme film avec différentes combinaisons et différentes épaisseurs possibles dans des plans avec des faibles indices de Miller [(001), (110) et (111)] (pour la phase cubique) et [(001), (100), (110), (101) et (111)] pour la phase tétragonale. Il se trouve que pour les différentes combinaisons et épaisseurs possibles dans ces trois / cinq plans avec faibles indices de Miller, seulement ZrO2-terminé sous forme d’un film orienté dans le plan (110)/(100) et O-terminé sous forme d’un film orienté (111)/(101) des phases cubique/tétragonale de ZrO2 maintiennent le caractère isolant même les épaisseurs d’empilement est réduit jusqu'à deux et trois couches atomiques. Puisque cubique et tétragonale ZrO2 ont grande anisotropie élastique, comme un exemple, le stress et l'énergie de déformation densité ont été calculées pour tous {hkl} -oriented grains d'un film ZrO2 cubique polycristallin<br>Transition-metal oxides have attracted exceptional research interest in recent years from both fundamental and technological perspectives. In this respect, we focus on two types of oxides, first, the double perovskite, Pb2FeMoO6 for a potential magnetoresistive and spintronics device application, second, zirconia ZrO2 with great mechanical and dielectric properties can be widely used in both structural and functional material fields. In this thesis we use first-principles calculations (ab-initio) to study systematically the detailed orbital-decomposed electronic structures and magnetic properties of Pb2FeMoO6 in the perfected bulk, defected bulk and slab structures. The detailed orbital-decomposed electronic structures, the mechanical, dynamical and dielectric properties of the ZrO2 in six phases (cubic, tetragonal, monoclinic, orthoI (Pbca), orthoII (Pnma) and (Pca21)) have also been studied.Firstly, considering the comparable ionic radius of Pb2+ (1.49Å) with that of Sr2+ (1.44Å), we propose for the first time to substitute Sr2+ ion with Pb2+ ion in Sr2FeMoO6 and a detailed study has been performed on the Pb2FeMoO6 in the perfected bulk, defected bulk and slab structures. The half-metallic nature and a complete (100%) spin-polarized transport properties reflect the bulk and especially slab Pb2FeMoO6 a potential application in magnetoresistive and spintronics devices; The detailed orbital-decomposed density of states show the octahedral crystal-field of the six oxygen atoms around transition-metal Fe or Mo atoms splits the five-fold degenerate states of the free Fe or Mo atoms into triply degenerate t2g (dxy, dyz and dzx) states with lower energy and doubly degenerate eg (dz2 and dx2-y2) states with higher energy, which cannot be observed in previous partial density of states ( ); The Fe3+ and Mo5+ ions are in the (3d5, s=5/2) and (4d1, s=1/2) states with positive and negative magnetic moments respectively and thus antiferromagnetic coupling via oxygen between them; The half-metallic character is maintained for the disordered Pb2FeMoO6 compounds containing FeMo antisite, VFe, VO, or VPb vacancy, while it vanishes when MoFe antisite, Fe-Mo interchange or VMo vacancy are presented even the defect concentration reduce down to C=6.25%. So the MoFe antisite, Fe-Mo interchange or VMo vacancy defects have to be avoided in order to preserve the half-metallic character of the Pb2FeMoO6 compounds and thus usable in magnetoresistive and spintronics devices.Secondly, based on the calculated individual elastic stiffness constants Cij of six ZrO2 phases, the elastic and mechanical properties of the polycrystalline aggregates have been predicted. We further exam the insulating characters of the cubic/tetragonal ZrO2 slabs with various possible terminations and thicknesses within three [(001), (110) and (111)]/five [(001), (100), (110), (101) and (111)] lower index Miller planes. It is found for the first time that among various possible terminations and thicknesses within these three/five lower index Miller planes, only ZrO2-terminated slabs of the (110)/(100) Miller plane and O-terminated slabs of the (111)/(101) Miller plane of cubic/tetragonal ZrO2 maintain the insulating character and thus usable as a gate dielectric oxide in IC industry even the slab thicknesses reduce down to 2 and 3 atomic layers, respectively; Since cubic and tetragonal ZrO2 have larger elastic anisotropy, both stress and strain energy density have been calculated for all {hkl}-oriented grains of a cubic ZrO2 polycrystalline film as one example
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Latham, Tina Joy. "Structure and properties of MTiOXO←4 crystals." Thesis, University of Warwick, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364604.

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Silva, Rosivaldo Xavier da. "Síntese e caracterização de perovskitas complexas multiferróicas com estrutura dupla ordenada." Universidade Federal do Maranhão, 2015. http://tedebc.ufma.br:8080/jspui/handle/tede/748.

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Made available in DSpace on 2016-08-18T18:44:20Z (GMT). No. of bitstreams: 1 Tese-RosivaldoXavierSilva.pdf: 12741226 bytes, checksum: 7bc7743bfa3e2f958b913f2d67969531 (MD5) Previous issue date: 2015-12-11<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The RE2CoMnO6 (RE = La e Y) and Gd(Co0.5Mn0.5)O3 samples were obtained via modified Pechini method (MPM). Raman spectroscopy (RS), Fourier transform infrared (FTIR) spectroscopy, X ray powder diffraction, X ray photoelectron spectroscopy (XPS), SQUID and scanning electron microscopy (SEM) were used to characterize the samples, investigate structural and microstructural evolution, as well as evaluate their vibrational, magnetic and intrinsic dielectric properties. The impact of synthesis conditions on the structural ordering was investigated. We obtained a good control of structural order depending on the annealing temperature for LCMO. We observed an increase in the saturation magnetization, lifetime of the phonons and dielectric constant while suppression of anti-site defects and reduction of dielectric loss. Our investigations on polar phonons by FTIR revealed the extrinsic character of CDC effect on LCMO and clarified the contributions of phonons for dielectric constant in these systems. The temperature dependence Raman spectra of GCMO was investigated between 40 and 300 K and revealed an intriguing spin-phonon coupling, characterized by an increase in the energy of the most intense stretching mode near the magnetic transítion. The correlation between the Raman data and the magnetization suggests that the structure influences the magnitude of the spin-phonon coupling. Correlated analysis of LCMO, GCMO and YCMO systems show that all samples have vibrational properties quite similar. The intrinsic dielectric constants were obtained from the polar phonons dispersive parameters ε intr ̴ 15.8, 17.9 and 16.0, making the contributions to this value explicit, as well as the quality factors, reciprocal of dielectric losses , 𝑄𝑢×𝑓 ≈ 124,74 e 83 THz, extrapolated to microwave region at 10 GHz, to LCMO, GCMO and YCMO, respectively. XPS measures showed that oxidation state for Co and Mn ions are similar each another, being mostly Co2 + and Mn4 + for all investigated systems, however to GCMO, the spin-phonon coupling behavior and losses relatively large indicate that this compound has a high level of structural disordering.<br>Amostras de RE2CoMnO6 (RE = La e Y) e Gd(Co0.5Mn0.5)O3 foram obtidas pelo método Pechini modificado (MPM). Espectroscopia Raman (RS), espectroscopia no infravermelho por transformada de Fourier (FTIR), difração de raios X (DRX), espectroscopia de fotoelétrons excitados por raios X (XPS), magnetometria e microscopia eletrônica de varredura (MEV) foram utilizados para caracterizar as amostras, investigar evolução estrutural e microestrutural bem como avaliar suas propriedades vibracionais, magnéticas e dielétricas intrínsecas. O efeito da temperatura de tratamento térmico sobre o ordenamento estrutural foi investigado. Um bom controle do ordenamento estrutural em função da temperatura de tratamento térmico para o La2CoMnO6 (LCMO) foi obtido. Observa-se um incremento da magnetização de saturação, aumento do tempo de vida dos fônons, supressão de defeitos de anti-sítio, redução de perdas dielétricas e incremento da constante dielétrica. A investigação dos fônons polares via FTIR revelaram o caráter extrínseco da constante dielétrica colossal (CDC) no LCMO e explicitou as contribuições dos fônons para a constante dielétrica nesses sistemas. A dependência dos espectros Raman com a temperatura do Gd(Co1/2Mn1/2)O3 (GCMO) foi investigada entre 40 e 300 K revelando um acoplamento spin-fônon, caracterizado pelo incremento na energia do modo de estiramento mais intenso próximo à transição magnética. A correlação entre os resultados obtidos pela espectroscopia Raman e a magnetização sugere que a ordem estrutural influencia a magnitude do acoplamento spin-fônon. Análise correlacionada dos sistemas LCMO, GCMO e YCMO, mostram que todas as amostras apresentam características vibracionais bastante semelhantes. A partir dos parâmetros de dispersão dos fônons polares foram obtidas as constantes dielétricas intrínsecas ε intr ̴ 15,8, 17,9 e 16,0, explicitando as contribuições dos fônons para esses valores, e o fator de qualidade, recíproco da perdas dielétricas, 𝑄𝑢×𝑓 ≈ 124,74 e 83 THz, extrapolado para a região de micro-ondas em 10 GHz, para o LCMO, GCMO e YCMO, respectivamente. Medidas de XPS mostraram que os estados de oxidação dos íons de Co e Mn são semelhantes entre si, e principalmente do tipo Co2+/ Mn4+ para todos os sistemas estudados, sendo que para o GCMO, o acoplamento spin-fônon e as perdas dielétricas relativamente maiores indicaram que esse sistema possui elevada desordem estrutural.
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FUJIMOTO, TALITA G. "Microestrutura e propriedades elétricas e dielétricas do titanato de estrôncio puro e contendo aditivos." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26933.

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Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2016-12-21T16:28:43Z No. of bitstreams: 0<br>Made available in DSpace on 2016-12-21T16:28:43Z (GMT). No. of bitstreams: 0<br>O titanato de estrôncio (SrTiO3) possui estrutura cristalina do tipo perovsquita. Materiais com este tipo de estrutura são utilizados para diversas aplicações, tais como, sensores, atuadores, em células a combustível de óxido sólido, entre outros. Devido as suas interessantes propriedades físicas, o SrTiO3 vem sendo intensamente estudado, em especial com a introdução de dopantes. Portanto, neste trabalho foi investigada a influência de diferentes teores de Ca (1; 2,5 e 5% mol) e Pr (0,025; 0,050; 0,075 e 1% mol) na microestrutura e propriedades elétricas e dielétricas do SrTiO3, assim como o material sem aditivos (puro). Os resultados mostram que após a sinterização do SrTiO3 puro, a microestrutura consiste de grãos poligonais com tamanho médio micrométrico, além de texturas lisas e rugosas. A condutividade elétrica das amostras sintetizadas sinterizadas a 1450 e 1500ºC é máxima para 2 horas de patamar. Apenas as amostras de SrTiO3 contendo 1% em mol de Ca apresentam fase única. O tamanho médio de grãos das amostras contendo 1% em mol de Ca é 10,65 &plusmn; 0,28 &micro;m e para teores acima deste valor ocorre crescimento significativo dos grãos. As medidas de condutividade elétrica mostraram que as amostras contendo a adição de 1% em mol de Ca possuem maior condutividade dos grãos em relação ao material puro. Para as amostras contendo teores de até 0,075% mol de Pr, pode-se observar alguns grãos lisos e outros rugosos e não há variação considerável do tamanho médio de grãos. As amostras contendo menor teor de Pr (0,025% mol) apresentam maior condutividade dos grãos e contornos de grãos. As amostras de SrTiO3 sintetizado sinterizadas a 1450ºC/10 h apresentaram permissividade elétrica colossal em temperatura ambiente em altas frequências.<br>Dissertação (Mestrado em Tecnologia Nuclear)<br>IPEN/D<br>Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
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REGRENY, RICARD ODILE. "Etude de la synthese et frittage d'oxynitrures de type perovskite en vue de leur application en tant que materiaux dielectriques." Rennes 1, 1988. http://www.theses.fr/1988REN10127.

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On a optimise la synthese d'oxynitrures de type abo::(2)n, de structure perovskite et presentant des caracteristiques dielectriques interessantes, afin d'obtenir des produits purs en grande quantite: batao::(2)n, srtao::(2)n, banbo::(2)n, srnbo::(2)n, ainsi que des solutions solides de ces composes. On a ensuite etudie leur densification sous atmosphere neutre ou non oxydante, avec ou sans ajouts de frittage, cherchant a obtenir une ceramique dielectrique. Une telle ceramique pourrait, utilisee comme materiau de base pour condensateurs multicouches, remplacer le batio::(3), qui doit etre cofritte avec des electrodes internes en metaux couteux
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Books on the topic "Multiferroic Oxides - Dielectric Properties"

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Nagaosa, N. Multiferroics. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0010.

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This chapter delves into the physics of multiferroics, the recent developments of which are discussed here from the viewpoint of the spin current and “emergent electromagnetism” for constrained systems. It presents the three sources of U(1) gauge fields, namely, the Berry phase associated with the noncollinear spin structure, the spin-orbit interaction (SOI), and the usual electromagnetic field. The chapter reviews multiferroic phenomena in noncollinear magnets from this viewpoint and discusses theories of multiferroic behavior of cycloidal helimagnets in terms of the spin current or vector spin chirality. Relativistic SOI leads to a coupling between the spin current and the electric polarization, and hence the ferroelectric and dielectric responses are a new and important probe for the spin states and their dynamical properties. Microscopic theories of the ground state polarization for various electronic configurations, collective modes including the electromagnon, and some predictions including photoinduced chirality switching are discussed with comparison to experimental results.
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Book chapters on the topic "Multiferroic Oxides - Dielectric Properties"

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Böttger, Ulrich. "Dielectric Properties of Polar Oxides." In Polar Oxides. Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527604650.ch1.

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Kim, Do Kyung, Ha Neul Kim, Young Hoon Seong, Seung Soo Baek, Eul Son Kang, and Yong Gi Baek. "Dielectric Properties of SiAlON Ceramics." In SiAlONs and Non-oxides. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908454-00-x.125.

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Guerra, J. D. S., Madhuparna Pal, G. S. Dias, I. A. Santos, R. Guo, and A. S. Bhalla. "Low Temperatures Dielectric Anomaly in BiFeO3 -Based Multiferroic Ceramics." In Processing and Properties of Advanced Ceramics and Composites VII. John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119183860.ch9.

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Muneeswaran, Muniyandi, Mayakrishnan Gopiraman, Shanmuga Sundar Dhanabalan, N. V. Giridharan, and Ali Akbari-Fakhrabadi. "Multiferroic Properties of Rare Earth-Doped BiFeO3 and Their Spintronic Applications." In Metal and Metal Oxides for Energy and Electronics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53065-5_11.

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Seong, Young Hoon, Ha Neul Kim, and Do Kyung Kim. "Dielectric Properties of β-SiAlON at High Temperature Using Perturbation Method." In SiAlONs and Non-oxides. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908454-00-x.121.

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Eng, L. M. "Nano-Inspection of Dielectric and Polarization Properties at Inner and Outer Interfaces in PZT Thin Films." In Polar Oxides. Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527604650.ch12.

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Khasbulatov, S. V., A. A. Pavelko, Larisa A. Reznichenko, et al. "Dielectric and Thermal Properties of Multiferroic Bismuth Ferrite Doped with Praseodymium and Neodymium." In Springer Proceedings in Physics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56062-5_11.

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Xi, X. X., Hong-Cheng Li, Weidong Si, and A. A. Sirenko. "Dielectric Properties and Applications of Strontium Titanate Thin Films for Tunable Electronics." In Nano-Crystalline and Thin Film Magnetic Oxides. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4493-3_14.

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Yue, Xinyan, Rong Tu, Takashi Goto, and Hongqiang Ru. "Effect of Alkaline Earth Oxides on Dielectric Properties of Polycrystalline BaTi2 O5 ), Prepared by ARC Melting." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470640845.ch70.

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Chen, Ren Zheng, Xiao Hui Wang, Jian Ling Zhao, et al. "Effects of Rare-Earth Oxides on Dielectric Properties of X7R Ceramics for Base Metal Internal Electrode Capacitors." In High-Performance Ceramics III. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.73.

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Conference papers on the topic "Multiferroic Oxides - Dielectric Properties"

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Balakrishnan, Geetha. "Multiferroic oxides: Growth of single crystals and investigation of their magnetic, dielectric and ferroelectric properties." In SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791545.

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Dhruv, Preksha N., Neha P. Solanki, and Rajshree B. Jotania. "Structural properties of delafossite multiferroic CuFeO2 powder." In FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982089.

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Rao, G. Ganapathi, D. Lakshmi, B. Lakshmi Rekha, K. Samatha, and M. P. Dasari. "Dielectric and piezoelectric properties of multiferroic BaTiO3-Li0.5Fe2.5O4 ceramics." In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980830.

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Kuroe, Haruhiko, Kento Aoki, Ryo Kino, et al. "Magnetic and Dielectric Properties in Multiferroic Cu3Mo2O9under High Magnetic Fields." In Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013). Journal of the Physical Society of Japan, 2014. http://dx.doi.org/10.7566/jpscp.3.014036.

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Chen, J. G., L. Y. Feng, G. Y. Shi, L. Zhao, S. W. Yu, and J. R. Cheng. "Dielectric and multiferroic properties of (Bi,La)FeO3-PbTiO3 ceramics." In European Conference on the Applications of Polar Dielectrics (ECAPD). IEEE, 2010. http://dx.doi.org/10.1109/isaf.2010.5712253.

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Bhasin, Tanvi, Ashish Agarwal, Sujata Sanghi, et al. "Structural, dielectric and magnetic properties of ZnFe2O4-Na0.5Bi0.5TiO3 multiferroic composites." In DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5029076.

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Reetu, A. Agarwal, S. Sanghi, and Ashima. "Structure, Dielectric relaxation And Magnetic Properties of Bi0.8Sr0.2Fe1−xTixO3 Multiferroic." In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. American Institute of Physics, 2011. http://dx.doi.org/10.1063/1.3653646.

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Song, Wei, Dong Zhang, Zhi Sun, et al. "Preparation and characterization of multiferroic BiFeO3." In 2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials (ICPADM). IEEE, 2012. http://dx.doi.org/10.1109/icpadm.2012.6318899.

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Meenal, Sujata Sanghi, Ashish Agarwal, et al. "Crystal structure, dielectric and magnetic properties of BaTiO3-CoFe2O4 multiferroic composites." In NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0060825.

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Yang, Wenhu, Wei-Hsin Liao, Shuhui Yu, and Rong Sun. "Dielectric properties of epoxy nanocomposites filled with copper oxides." In 2017 18th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2017. http://dx.doi.org/10.1109/icept.2017.8046657.

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Reports on the topic "Multiferroic Oxides - Dielectric Properties"

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Miller, Virginia L., and Steven C. Tidrow. Investigation into the Effect of Reagent Choice on the Dielectric Properties of the Ferroelectric Oxides Ba(MTa)0.05Ti0.9O3 (where M=Sc, Er, Ho or Y). Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada487104.

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