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Gotowa bibliografia na temat „Multiferroic Oxides - Structural Properties”

Autor: Grafiati
Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "Multiferroic Oxides - Structural Properties"

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Gareeva Z. V., Zvezdin A. K., Shulga N. V., Gareev T. T. i Chen X. M. "Mechanisms of magnetoelectric effects in oxide multiferroics with a perovskite praphase". Physics of the Solid State 64, nr 9 (2022): 1324. http://dx.doi.org/10.21883/pss.2022.09.54175.43hh.

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Magnetoelectric effects are discussed in multiferroics with the perovskite structure: bismuth ferrite, rare-earth orthochromites, and Ruddlesden--Popper structures belonging to the trigonal, orthorhombic, and tetragonal syngonies. The influence of structural distortions on magnetic and ferroelectric properties is studied, possible magnetoelectric effects (linear, quadratic, inhomogeneous) in these materials are determined, and expressions for the linear magnetoelectric effect tensor are given. Macroscopic manifestations of the inhomogeneous magnetoelectric effect in multiferroic nanoelements are considered. Keywords: multiferroics, magnetoelectric effect, perovskites, symmetry.
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Xu, Xiaoshan, i Wenbin Wang. "Multiferroic hexagonal ferrites (h-RFeO3, R = Y, Dy-Lu): a brief experimental review". Modern Physics Letters B 28, nr 21 (20.08.2014): 1430008. http://dx.doi.org/10.1142/s0217984914300087.

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Hexagonal ferrites ( h - RFeO 3, R = Y , Dy - Lu ) have recently been identified as a new family of multiferroic complex oxides. The coexisting spontaneous electric and magnetic polarizations make h - RFeO 3 rare-case ferroelectric ferromagnets at low temperature. Plus the room-temperature multiferroicity and the predicted magnetoelectric effect, h - RFeO 3 are promising materials for multiferroic applications. Here we review the structural, ferroelectric, magnetic and magnetoelectric properties of h - RFeO 3. The thin film growth is also discussed because it is critical in making high quality single crystalline materials for studying intrinsic properties.
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Lorenz, Michael. "Pulsed laser deposition of functional oxides - towards a transparent electronics". Acta Crystallographica Section A Foundations and Advances 70, a1 (5.08.2014): C1412. http://dx.doi.org/10.1107/s2053273314085878.

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Metal oxides, in particular with transition metals, show strong electronic correlations which determine a huge variety of electronic properties, together with other functionalities. For example, ZnO and Ga2O3 as wide-bandgap semiconductors have a high application potential as transparent functional layers in future oxide electronics [1-2]. Other oxides of current interest are ferrimagnetic spinels of the type MFe2O4 (M=Zn,Co,Ni), see K. Brachwitz et al. Appl. Phys. Lett. 102, 172104 (2013), or highly correlated iridate films, see M. Jenderka et al. Phys. Rev. B 88, 045111 (2013). Furthermore, combinations of ferroelectric and magnetic oxides in multiferroic composites and multilayers show promising magnetoelectric coupling. For the exploratory growth of the above mentioned novel oxides into nm-thin films, pulsed laser deposition (PLD) appears as the method of choice because of its extremely high flexibility in terms of material and growth conditions, high growth rate and excellent structural properties [3]. This talk highlights recent developments of new functional oxides using unique large-area PLD processes running for more than two decades in the lab of the author [3].
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Watson, Carla, Tara Peña, Marah Abdin, Tasneem Khan i Stephen M. Wu. "Dynamic adhesion of 2D materials to mixed-phase BiFeO3 structural phase transitions". Journal of Applied Physics 132, nr 4 (28.07.2022): 045301. http://dx.doi.org/10.1063/5.0096686.

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Two-dimensional materials, such as transition metal dichalcogenides, have generated much interest due to their strain-sensitive electronic, optical, magnetic, superconducting, or topological properties. Harnessing control over their strain state may enable new technologies that operate by controlling these materials’ properties in devices such as straintronic transistors. Piezoelectric oxides have been proposed as one method to control such strain states on the device scale. However, there are few studies of how conformal 2D materials remain on oxide materials with respect to dynamic applications of the strain. Non-conformality may lead to non-optimal strain transfer. In this work, we explore this aspect of oxide-2D adhesion in the nanoscale switching of the substrate structural phase in thin 1T′-MoTe2 attached to a mixed-phase thin-film BiFeO3 (BFO), a multiferroic oxide with an electric-field induced structural phase transition that can generate mechanical strains of up to 2%. We observe that flake thickness impacts the conformality of 1T′-MoTe2 to structural changes in BFO, but below four layers, 1T′-MoTe2 fully conforms to the nanoscale BFO structural changes. The conformality of few-layer 1T′-MoTe2 suggests that BFO is an excellent candidate for deterministic, nanoscale strain control for 2D materials.
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Dash, Swagatika, R. N. P. Choudhary, Piyush R. Das i Ashok Kumar. "Structural, dielectric, and multiferroic properties of (Bi0.5K0.5)(Fe0.5Nb0.5)O3". Canadian Journal of Physics 93, nr 7 (lipiec 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 i Piyush R. Das. "Studies of electrical conductivity and magnetic properties of Bi1-xGdxFeO3 multiferroics". Journal of Advanced Dielectrics 04, nr 02 (kwiecień 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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Barrier, Nicolas. "Search for new tellurium and selenium oxides with potential ferroelectric and multiferroic properties". Acta Crystallographica Section A Foundations and Advances 75, a2 (18.08.2019): e204-e204. http://dx.doi.org/10.1107/s2053273319093525.

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Moustafa, A. M., S. A. Gad, G. M. Turky i 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, nr 3 (1.03.2022): 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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Sun, Shujie, i Xiaofeng Yin. "Progress and Perspectives on Aurivillius-Type Layered Ferroelectric Oxides in Binary Bi4Ti3O12-BiFeO3 System for Multifunctional Applications". Crystals 11, nr 1 (29.12.2020): 23. http://dx.doi.org/10.3390/cryst11010023.

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Driven by potentially photo-electro-magnetic functionality, Bi-containing Aurivillius-type oxides of binary Bi4Ti3O12-BiFeO3 system with a general formula of Bin+1Fen−3Ti3O3n+3, typically in a naturally layered perovskite-related structure, have attracted increasing research interest, especially in the last twenty years. Benefiting from highly structural tolerance and simultaneous electric dipole and magnetic ordering at room temperature, these Aurivillius-phase oxides as potentially single-phase and room-temperature multiferroic materials can accommodate many different cations and exhibit a rich spectrum of properties. In this review, firstly, we discussed the characteristics of Aurivillius-phase layered structure and recent progress in the field of synthesis of such materials with various architectures. Secondly, we summarized recent strategies to improve ferroelectric and magnetic properties, consisting of chemical modification, interface engineering, oxyhalide derivatives and morphology controlling. Thirdly, we highlighted some research hotspots on magnetoelectric effect, catalytic activity, microwave absorption, and photovoltaic effect for promising applications. Finally, we provided an updated overview on the understanding and also highlighting of the existing issues that hinder further development of the multifunctional Bin+1Fen−3Ti3O3n+3 materials.
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Li, Jun, Elena A. Medina, Judith K. Stalick, Arthur W. Sleight i M. A. Subramanian. "Structural studies of CaAl12O19, SrAl12O19, La2/3+δ Al12–δO19, and CaAl10NiTiO19 with the hibonite structure; indications of an unusual type of ferroelectricity". Zeitschrift für Naturforschung B 71, nr 5 (1.05.2016): 475–84. http://dx.doi.org/10.1515/znb-2015-0224.

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AbstractVarious oxides with the hibonite structure were synthesized and structurally analyzed using powder neutron diffraction. The structure of CaAl12O19 at 298 and 11 K shows dipoles that are apparently too dilute to order unless subjected to a suitable electric field. Magnetoplumbites, such as BaFe12O19, are isostructural with hibonite. These compounds possess ferromagnetic properties, which combined with the electric dipoles may influence multiferroic behavior. Our SrAl12O19 sample showed two distinct hexagonal phases, a major phase with the normal hibonite structure and a minor phase having a closely related structure. Our sample of the defect hibonite phase La2/3+δAl12–δO19 shows a distinctly higher δ value (0.25) vs. that reported (~0.15) for samples made from the melt. Finally, we used to advantage the negative scattering length of Ti to determine the site occupancies of Ni and Ti in CaAl10NiTiO19.
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Rozprawy doktorskie na temat "Multiferroic Oxides - Structural Properties"

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Vaghefi, Seyedeh Pegah Mirzadeh. "Structural and physical properties studies on multiferroic oxide films and heterostructures". Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/18502.

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Doutoramento em Engenharia Física
O presente trabalho de doutoramento é um estudo de propriedades físicas e aspectos estruturais de filmes de óxidos e heteroestruturas multiferróicas, englobando técnicas de caracterização do nível macroscópico ao microscópico. O objectivo principal é a compreensão de novas heteroestruturas epitaxiais multifuncionais e as suas interfaces para junções de túnel magnetoelétricas e filtros de spin. Os principais materiais em estudo foram manganitas à base de La dopadas com iões divalentes (ba, Sr), apresentando efeito magnetoelétrico, sendo preparadas em diferentes substratos e diferentes técnicas de crescimento, optimizadas para epitaxia e qualidade de interface. O estudo combinado de propriedades eléctricas e magnéticas permitiu estabelecer as condições necessárias para a aplicação dos materiais multiferróicos em estudo, por técnicas experimentais apresentadas neste trabalho. O trabalho consistiu no estudo sistemático de microestrutura de filmes finos de La0:7Sr0:3MnO3 em substratos de SrTiO3, preparados por pulsed laser deposition, o filme fino de La0:9Ba0:1MnO3 e a heteroestrutura La0:9Ba0:1MnO3/BaTiO3/La0:9Ba0:1MnO3 em substrato de Al2O3, e filme fino de La0:9Ba0:1MnO3, BaTiO3 e heteroestrutura de La0:9Ba0:1MnO3/BaTiO3/La0:9Ba0:1MnO3 em substrato de Si, preparado por RF magnetron sputtering. A caracterização estrutural das amostras foi feita principalmente por difracção de raio-X (XRD) convencional e de alta resolução e Microscopia de Transmissão de Alta Resolução (HRTEM). A composição química foi analisada por Electron Dispersion Spectroscopy (EDS), Rutherford backscattering spectroscopy (RBS) e energy filtered transmission electron microscopy (EFTEM). As medidas de magnetização forram realizada com a um magnetómetro superconducting quantum interference device (SQUID). A análise da topografia e efeitos locais foi realizada por microscopia de varimento de ponta usando microscopia da Força Atómica (AFM) e de resposta piezoeléctronica (PFM). Os resultados mostram claramente uma evolução da microestrutura dos filmes finos de La0:7Sr0:3MnO3, á medida que aumenta a sua espessura, passando de uma estrutura policristalina no filme mais fino (13.5 nm) a colunar inclinado (45 nm e 200 nm), a uma estrutura ramificada no filme mais espesso (320 nm). A alteração na estrutura do filme é devida à tensão pelo substrato e deformação da estrutura nas etapas iniciais de crescimento, onde se detectaram fronteiras anti-phase e maclas. A evolução da estrutura modificou as propriedades magnéticas dos filmes a baixa temperatura (abaixo da temperatura de transição estrutural do substrato de SrTiO3), mostrando magnetização em excesso e defeito, para espessuras abaixo e acima de 100 nm, respectivamente. Análises STEM-EELS e EFTEM mostraram a diferença em composição elementar dos filmes perto das fronteiras e na interface com o substrato.No âmbito do plano de trabalhos de doutoramento, o segundo substrato consiste em estudar as propriedades físicas e estruturais de filmes finos de La0:9Ba0:1MnO3 e heteroestruturas La0:9Ba0:1MnO3/BaTiO3/La0:9Ba0:1MnO3 em substratos de Al2O3, revelando estruturas altamente orientadas. A razão La/Ba do filme e heteroestrutura é drasticamente diferente do alvo providenciado, La0:7Ba0:3MnO3, como provado por XRD, RBS e transições de fase magnéticas. As propriedades magnéticas e eléctricas das estruturas mostraram uma forte dependência na cristalinidade do filme e da heteroestrutura. A parte final do trabalho é dedicada aos filmes de La0:9Ba0:1MnO3, BaTiO3 e a heteroestrutura de La0:9Ba0:1MnO3/BaTiO3/La0:9Ba0:1MnO3 em substrato de Si, que em comparação com as estruturas em substrato de ALO, provaram o efeito da cristalinidade nas propriedades magnéticas, eléctricas e de magneto-resistência do filme e heteroestrutura. Foi mostrado que um grau superior de cristalinidade leva a uma mais elevada magnetização, reduzindo a resistividade das estruturas. Pela primeira vez, um estudo de deformação de topografia por aplicação de uma tensão dc externa foi feito num filme fino de BaTiO3 em Si, usando uma técnica de poling num microscópio de força piezoresponse. Os resultados mostraram a capacidade de uma modificação controlada da superfície, por aplicação de uma voltagem externa nointervalo 14V < Vapp < 20V. Abaixo destes valores, não se observou alguma deformação na topografia, enquanto acima deste intervalo, a 30V, a superfície foi completamente danificada. A mudança topográfica produzida mostrou estabilidade no tempo, onde após a aplicação de 20V, a área modificada alcançou 83% da altura as-poled ( 9 nm) em 90 minutos, a 7,4 nm. A resposta assimétrica de piezoresponse da área poled foi associada à existência de um campo eléctrico interno na amostra, que foi também provado através de medidas de espectroscopia de switching no filme fino. A heteroestrutura no substrato de Si mostraram o mesmo fenómeno que a mono-camada de BaTiO3, onde o arranjo de heteroestrutura realça o efeito de voltagem aplicada na topografia. Aplicando 10V, a estrutura da superfície foi alterada na heteroestrutura e houve uma modificação visível da camada de BaTiO3, alterando também a topografia da camada superior de La0:9Ba0:1MnO3.
This present PhD work made a study of structural aspects and physical properties of the oxide films and multiferroic heterostructures, encompassing the techniques from macroscopic level to microscopic description. The understanding of novel multifunctional epitaxial heterostructures and their interfaces for magneto-electrically driven tunnel junctions and spin-filters is the central objective. The main materials in study were La based doped manganites with magnetoelectric effect prepared on different substrates and growth conditions, optimized for epitaxy and interface quality. The combined study of electric and magnetic properties allowed us examining the conditions required for application of the studied multiferroic materials and experimental techniques are presented in this work. The work consists of three main substrates, a systematic study of microstructure of La0:7Sr0:3MnO3 thin films on SrTiO3 substrate, prepared by pulsed laser deposition, the La0:9Ba0:1MnO3 thin film and La0:9Ba0:1MnO3/BaTiO3/La0:9Ba0:1MnO3 heterostructure on Al2O3 substrate, and the La0:9Ba0:1MnO3 thin film, BaTiO3 and La0:9Ba0:1MnO3/BaTiO3/La0:9Ba0:1MnO3 heterostructure on Si substrate, prepared by RF magnetron sputtering. Main structural characterization of samples was performed by conventional and high resolution X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM); chemical composition was determined by Electron Dispersion Spectroscopy (EDS), Rutherford Backscattering Spectroscopy (RBS) and Energy Filtered Transmission Electron Microscopy (EFTEM); Magnetization measurements done with a Superconducting Quantum Interface Device (SQUID) magnetometer. Surface probing of topography and local effects was performed, using Atomic Force (AFM) and Piezo-Response (PFM) Microscopy. Results clearly showed that there is an evolution in the microstructure of the La0:7Sr0:3MnO3 thin films, by increasing their thickness, changing from polycrystalline structure in the thinnest film (13.5 nm) to tilted columnar structure(45 nm and 200 nm) and to a branched structure in the thickest film (320 nm). The change in the structure of the film is due to the strain from the substrate and deformation of the structure in the early stages of the growth, where anti-phase boundaries and twinning were detected. The evolution of the structure modified the low temperature (below structural phase transition of SrTiO3 substrate) magnetic properties of the films, showing in-excess and in-defect magnetization, below and above 100 nm thickness, respectively. Also, STEM-EELS and EFTEM analysis showed the difference in the elemental composition of the films near the boundaries and interface with the substrate.In the scope of the PhD work plan, the second substrate consists of studying the structural and physical properties of La0:9Ba0:1MnO3 thin film and La0:9Ba0:1MnO3/BaTiO3/La0:9Ba0:1MnO3 heterostructure on Al2O3 substrate, where they showed highly oriented structure. The La/Ba ratio of the single layer film and heterostructure is drastically different from the target, La0:7Ba0.3MnO3, proven by XRD, RBS, and magnetic phase transitions. The magnetic and electrical properties of the structures showed strong dependence on the crystallinity of the samples. The final part of the work is devoted to the La0:9Ba0:1MnO3 and BaTiO3 thin films and La0:9Ba0:1MnO3/BaTiO3/La0:9Ba0:1MnO3 heterostructure on Si substrate, which in comparison with the structures on Al2O3 substrate, highlights the influence of crystallinity on magnetic, ferro-electrical and magnetoresistance properties of the film and heterostructure. It is shown that higher degree of crystallinity leads to higher magnetization and lowers the resistivity. For the first time, a study of the topography deformation by applying a dcexternal voltage was done on BaTiO3 thin film on Si, using a poling technique in a piezoresponse force microscope. The results show the ability of controlled modification of the surface, by applying an external voltage/electric field in the range of 14V< Vapp<20V. Below this range, no deformation is observed on the topography, and above this interval, at 30V, the surface is completely damaged. The produced topographical change show stabilization in respect to time, where after applying 20V, the modified area reaches its 83% of the as-poled height ( 9nm) in 90 minutes, to 7.4 nm. The asymmetrical response in the piezoresponse of the poled area is related to the existence of an internal built-in electric field in the sample, which is also confirmed by performing switching spectroscopy measurements on the single layer. The heterostructure on the Si substrate shows the same phenomena, as the BTO single layer, where the heterostructure arrangement enhances the applied voltage effect on the topography. With applying 10V, the structure of the surface changes in the heterostructure and a visible modification of BaTiO3 layer, changing also the topography of La0:9Ba0:1MnO3 top layer is observed.
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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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Geatches, Rachel M. "Electrical and structural properties of metal oxides". Thesis, University of Kent, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278079.

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Regoutz, Anna. "Structural and electronic properties of metal oxides". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:6f425890-b211-4b35-b438-b8de18f7ae64.

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Metal oxides are of immense technological importance. Their wide variety of structural and electronic characteristics leads to a flexibility unrivalled by other groups of materials. However, there is still much debate about the fundamental properties of some of the most widely used oxides, including TiO2 and In2O3. This work presents high quality, in-depth characterisation of these two oxides in pure and doped form, including soft and hard X-ray photoelectron spectroscopy and X-ray diffraction. Bulk samples as well as thin film samples were prepared analysed. For the preparation of thin films a high quality sol-gel dip-coating method was developed, which resulted in epitaxial films. In more detail the organisation of the thesis is as follows: Chapter 1 provides an introduction to key ideas related to metal oxides and presents the metal oxides investigated in this thesis, In2O3, Ga2O3, Tl2O3, TiO2, and SnO2. Chapter 2 presents background information and Chapter 3 gives the practical details of the experimental techniques employed. Chapters 4 presents reciprocal space maps of MBE-grown In2O3 thin films and nanorods on YSZ substrates. Chapters 5 and 6 investigate the doping of In2O3 bulk samples with gallium and thallium and introduce a range of solid state characterisation techniques. Chapter 7 describes the development of a dip-coating sol-gel method for the growth of thin films of TiO2 and shows 3D reciprocal space maps of the resulting films. Chapter 8 concerns hard x-ray photoelectron spectroscopy of undoped and Sn-doped TiO2. Chapter 9 interconnects previous chapters by presenting 2D reciprocal space maps of nano structured epitaxial samples of In2O3 grown by the newly developed sol-gel based method. Chapter 10 concludes this thesis with a summary of the results.
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Thrall, Michael. "The magnetic, electric and structural properties of multiferroic BiFeo3 and BiMnO3". Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492716.

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Bulk BiFe03 samples prepared by the conventional mixed oxide route were investigated. High purity Bi203 and Fe203 powders were weighed according to stoichiometry and milled for 20 hours. The powders were pressed into cylinders (10mm diameter by 6mm thickness) at 100 MPa. The cylinders were heated at a rate of 3 degrees C/min at temperatures of between 700 degrees C and 900°C for times between 7.5 minutes and 48 hours. XRD spectra collected from both the as-sintered and 'bulk' (internal) surfaces showed the formation of additional Bi2Fe40, and Bi25Fe04o secondary phases coexisting alongside the main BiFeOs phase.
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Millburn, Julie Elizabeth. "Structural and electronic properties of transition metal oxides". Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364166.

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Jones, Christopher Wynne. "Structural and electronic properties of mixed metal oxides". Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235645.

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Abbas, Hussien Ahmed, Fadwaa Fwad Hamad, Atrees Khair Mohamad, Zeinab Mohamad Hanafi i Martin Kilo. "Structural properties of zirconia doped with some oxides". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192913.

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Zirconia powders doped with different amounts of dopants (CeO2, Gd2O3, and CaO) were synthesized by a citrate technique. X-ray diffraction for samples sintered at 1500 °C revealed that the zirconia ceramics were stabilized in the cubic phase above 12 mole % CaO and 10 mole % Gd2O3, while tetragonal zirconia is obtained above 15 mole % CeO2. Relative densities up to 99.5% were obtained. The effect of dopant concentration on the lattice parameter, average crystallite size, microstrain was studied. The cubic lattice parameter increases nearly linearly with increasing the concentration in case of CaO and Gd2O3. The tetragonal lattice parameters at and ct increase nearly linearly with increasing the concentration of CeO2. The average crystallite size was found to be larger than 600 nm for the samples investigated.
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Abbas, Hussien Ahmed, Fadwaa Fwad Hamad, Atrees Khair Mohamad, Zeinab Mohamad Hanafi i Martin Kilo. "Structural properties of zirconia doped with some oxides". Diffusion fundamentals 8 (2008) 7, S. 1-8, 2008. https://ul.qucosa.de/id/qucosa%3A14153.

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Zirconia powders doped with different amounts of dopants (CeO2, Gd2O3, and CaO) were synthesized by a citrate technique. X-ray diffraction for samples sintered at 1500 °C revealed that the zirconia ceramics were stabilized in the cubic phase above 12 mole % CaO and 10 mole % Gd2O3, while tetragonal zirconia is obtained above 15 mole % CeO2. Relative densities up to 99.5% were obtained. The effect of dopant concentration on the lattice parameter, average crystallite size, microstrain was studied. The cubic lattice parameter increases nearly linearly with increasing the concentration in case of CaO and Gd2O3. The tetragonal lattice parameters at and ct increase nearly linearly with increasing the concentration of CeO2. The average crystallite size was found to be larger than 600 nm for the samples investigated.
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Harrison, W. T. A. "Structural and magnetic properties of some mixed metal oxides". Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379947.

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Książki na temat "Multiferroic Oxides - Structural Properties"

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Cao, Gang, i Lance DeLong. Physics of Spin-Orbit-Coupled Oxides. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199602025.001.0001.

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Prior to 2010, most research on the physics and chemistry of transition metal oxides was dominated by compounds of the 3d-transition elements such as Cr, Mn, Fe, Co, Ni, and Cu. These materials exhibited novel, important phenomena that include giant magnetoresistance in manganites, as well as high-temperature superconductivity in doped La2CuO4 and related cuprates. The discovery in 1994 of an exotic superconducting state in Sr2RuO4 shifted some interest toward ruthenates. Moreover, the realization in 2008 that a novel variant of the classic Mott metal-insulator transition was at play in Sr2IrO4 provided the impetus for a burgeoning group of studies of the influence of strong spin-orbit interactions in “heavy” (4d- and 5d-) transition-element oxides. This book reviews recent experimental and theoretical evidence that the physical and structural properties of 4d- and 5d-oxides are decisively influenced by strong spin-orbit interactions that compete or collaborate with comparable Coulomb, magnetic exchange, and crystalline electric field interactions. The combined effect leads to unusual ground states and magnetic frustration that are unique to this class of materials. Novel couplings between the orbital/lattice and spin degrees of freedom, which lead to unusual types of magnetic order and other exotic phenomena, challenge current theoretical models. Of particular interest are recent investigations of iridates and ruthenates focusing on strong spin-orbit interactions that couple the lattice and spin degrees of freedom.
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Części książek na temat "Multiferroic Oxides - Structural Properties"

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Muneeswaran, Muniyandi, Mayakrishnan Gopiraman, Shanmuga Sundar Dhanabalan, N. V. Giridharan i Ali Akbari-Fakhrabadi. "Multiferroic Properties of Rare Earth-Doped BiFeO3 and Their Spintronic Applications". W Metal and Metal Oxides for Energy and Electronics, 375–95. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53065-5_11.

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Moodenbaugh, A. R., J. J. Hurst, T. Asano, R. L. Sabatini i M. Suenaga. "Superconducting Properties and Structural Characterization of High Tc Oxides". W Novel Superconductivity, 767–69. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1937-5_95.

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Sayyed, Saima G., Annis A. Shaikh, Pankaj K. Bhujbal, Arif V. Shaikh, Habib M. Pathan i Prafulla Kumar Jha. "Structural and Electronic Properties of Various Useful Metal Oxides". W Chemically Deposited Nanocrystalline Metal Oxide Thin Films, 49–84. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68462-4_3.

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Syono, Y., i M. Kikuchi. "Shock Effects on Structural and Superconducting Properties of High Tc Oxides". W Shock Waves in Materials Science, 101–12. Tokyo: Springer Japan, 1993. http://dx.doi.org/10.1007/978-4-431-68240-0_5.

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Bonačić-Koutecký, V., J. Pittner, R. Pou-Amérigo i M. Hartmann. "Ab-initio study of structural and optical properties of nonstoichiometric alkalimetal- oxides". W Small Particles and Inorganic Clusters, 445–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60854-4_105.

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Leng, Kai, Weiren Xia i Xinhua Zhu. "Advanced Nanostructured Perovskite Oxides: Synthesis, Physical Properties, Structural Characterizations and Functional Applications". W Advanced Ceramics for Energy and Environmental Applications, 13–81. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003005155-2.

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Farozan, Shama, Harendra Kumar Satyapal, Om Priya, Saurabh Sharma i Singh Sonu Kumar. "Effect of La3+ Substitution on Structural, Magnetic, and Multiferroic Properties of Bismuth Ferrite (Bi1-xLaxFeO3) Nanoceramics". W Computational and Experimental Methods in Mechanical Engineering, 105–13. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2857-3_13.

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Raveau, Bernard, i Claude Michel. "Mixed Valence Copper Oxides, High Tc Superconductors : Structural Study and Electron Transport Properties". W Novel Superconductivity, 599–610. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1937-5_69.

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Møller, P. J., S. A. Komolov i E. F. Lazneva. "Structural and Electronic Properties of Ultrathin Cu-Layers on some Crystalline Metal-Oxides". W Adsorption on Ordered Surfaces of Ionic Solids and Thin Films, 156–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78632-7_15.

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de Lazaro, Sergio R., Renan A. P. Ribeiro, Marisa C. Oliveira i Elson Longo. "Advanced DFT Atomistic Approaches for Electronic, Optical, and Structural Properties of Semiconductor Oxides". W Research Topics in Bioactivity, Environment and Energy, 255–65. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07622-0_9.

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Streszczenia konferencji na temat "Multiferroic Oxides - Structural Properties"

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Dhruv, Preksha N., Neha P. Solanki i Rajshree B. Jotania. "Structural properties of delafossite multiferroic CuFeO2 powder". W 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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Salmani, Imran Ahmad, Tahir Murtaza, Apurva Gupta, Mohd Shahid Khan i Mohd Saleem Khan. "Synthesis and structural properties of multiferroic Bi0.95Mg0.05FeO3". W 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032467.

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Chotorlishvili, L., M. Azimi, S. Stagraczyński i J. Berakdar. "Quantum Heat Engines with Multiferroic Working Substance". W Symmetry and Structural Properties of Condensed Matter. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813234345_0001.

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Galav, K. L., V. Maurya i K. B. Joshi. "Structural and electronic properties of B2-CdNb". W FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982111.

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Parekh, Sagar, Mohini Ramwala, Ruchi Rathod, Deobrat Singh, Sanjeev K. Gupta i Yogesh Sonvane. "Structural, electronic and ferroelectric properties of BaTcO3". W FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982114.

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Chanu, Lisham Paris, i Sumitra Phanjoubam. "Structural and electrical properties of multiferroic YMnO3 and YMn0.9Cr0.06Ni0.04O3". W DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016671.

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Sinha, A. K., B. Bhushan, D. Rout, R. K. Sharma, J. Gupta, S. Sen, M. D. Mukadam, S. S. Meena i S. M. Yusuf. "Structural and magnetic properties of Cr doped BiFeO3 multiferroic nanoparticles". W DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980321.

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Bhasin, Tanvi, Ashish Agarwal, Sujata Sanghi, Manisha Yadav, Muskaan Tuteja, Jogender Singh i Sonia Rani. "Structural, dielectric and magnetic properties of ZnFe2O4-Na0.5Bi0.5TiO3 multiferroic composites". W DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5029076.

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Sagapariya, Khushal, K. N. Rathod, Keval Gadani, Hetal Boricha, V. G. Shrimali, Bhargav Rajyaguru, Amiras Donga i in. "Investigations on structural, optical and electrical properties of V2O5 nanoparticles". W FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982084.

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Singh, Manoj K., G. L. Sharma, S. Dussan i Ram S. Katiyar. "Structural properties of multiferroic CuFeO2 thin films prepared by RF sputtering". W 2008 17th IEEE International Symposium on the Applications of Ferroelectrics (ISAF). IEEE, 2008. http://dx.doi.org/10.1109/isaf.2008.4693787.

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Raporty organizacyjne na temat "Multiferroic Oxides - Structural Properties"

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Ahmed, M. A., M. S. Ayoub, M. M. Mostafa i M. M. El-Desoky. Structural and multiferroic properties of nanostructured barium doped Bismuth Ferrite. Redaktorzy Lotfia Elnai i Ramy Mawad. Journal of Modern trends in physics research, grudzień 2014. http://dx.doi.org/10.19138/mtpr/(14)81-89.

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Chelikowsky, J. R. Theory of the electronic and structural properties of solid state oxides. Office of Scientific and Technical Information (OSTI), styczeń 1990. http://dx.doi.org/10.2172/6564106.

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Das, Supriyo. Synthesis and structural, magnetic, thermal, and transport properties of several transition metal oxides and aresnides. Office of Scientific and Technical Information (OSTI), styczeń 2010. http://dx.doi.org/10.2172/985308.

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Chelikowsky, J. R. Theory of the electronic and structural properties of solid state oxides. Annual technical report 1993. Office of Scientific and Technical Information (OSTI), czerwiec 1993. http://dx.doi.org/10.2172/10162151.

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Chelikowsky, J. R. Theory of the electronic and structural properties of solid state oxides. Progress report, [July 1, 1992--June 30, 1993]. Office of Scientific and Technical Information (OSTI), styczeń 1993. http://dx.doi.org/10.2172/10159378.

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Chelikowsky, J. R. Theory of the electronic and structural properties of solid state oxides. Progress report, [July 1, 1991--June 30, 1992]. Office of Scientific and Technical Information (OSTI), październik 1991. http://dx.doi.org/10.2172/10159577.

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