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Effect Of Impurities Off Stoichiometry And Site Disorder On Structural And Magnetic Properties Of Transition Metal Oxides Induced By Different Synthesis Conditions
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Book Synopsis Effect of Impurities, Off-stoichiometry and Site-disorder on Structural and Magnetic Properties of Transition Metal Oxides Induced by Different Synthesis Conditions by : Gizem Aslan-Cansever
Download or read book Effect of Impurities, Off-stoichiometry and Site-disorder on Structural and Magnetic Properties of Transition Metal Oxides Induced by Different Synthesis Conditions written by Gizem Aslan-Cansever and published by . This book was released on 2021* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure Processing Properties Relationships in Stoichiometric and Nonstoichiometric Oxides by : Speranta Tanasescu
Download or read book Structure Processing Properties Relationships in Stoichiometric and Nonstoichiometric Oxides written by Speranta Tanasescu and published by BoD – Books on Demand. This book was released on 2020-11-04 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interrelation among composition, microstructure, and properties of stoichiometric and nonstoichiometric compounds is a major field of research for both scientific and technological reasons. As such, this book focuses on metal oxides, which present a large diversity of electrical, magnetic, optical, optoelectronic, thermal, electrochemical, and catalytic properties, making them suitable for a wide range of applications. By bringing together scientific contributions with special emphasis on the interrelations between materials chemistry, processing, microstructures, and properties of stoichiometric and nonstoichiometric metal oxides, this book highlights the importance of tightly integrating high-throughput experiments (including both synthesis and characterization) and efficient and robust theory for the design of advanced materials.
Book Synopsis Synthesis, Structural and Magnetic Properties of Some Transition Metal Oxides by : Kunlang Ji
Download or read book Synthesis, Structural and Magnetic Properties of Some Transition Metal Oxides written by Kunlang Ji and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transition Metal Oxides by : H.H. Kung
Download or read book Transition Metal Oxides written by H.H. Kung and published by Elsevier. This book was released on 1989-04-01 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book the author presents an up-to-date summary of existing information on the structure, electronic properties, chemistry and catalytic properties of transition metal oxides. The subjects covered in the book can be divided into three sections. The first (chapters 1 to 3) covers the structural, physical, magnetic, and electronic properties of transition metal oxides. Although the emphasis is on surface properties, relevant bulk properties are also discussed. The second section (chapters 4 to 7) covers surface chemical properties. It includes topics that describe the importance of surface coordinative unsaturation in adsorption, the formation of surface acidity and the role of acidity in determining surface chemical properties, the nature and reactivities of adsorbed oxygen, and the surface chemistry in the reduction of oxides. The third section (chapters 8 to 14) is on the catalytic properties. Various catalytic reactions including decomposition, hydrogenation, isomerization, metathesis, selective oxidation, and reactions involving carbon oxides are discussed. Emphasis is placed more on reaction mechanisms and the role of catalysts than on kinetics and processes. Chapters on the preparation of oxide catalysts and on photo-assisted processes are also included. Whenever appropriate, relationships between various topics are indicated. Written for surface physicists, chemists, and catalytic engineers, the book will serve as a useful source of information for investigators and as a comprehensive overview of the subject for graduate students.
Book Synopsis Frontiers Of 4d- And 5d-transition Metal Oxides by : Gang Cao
Download or read book Frontiers Of 4d- And 5d-transition Metal Oxides written by Gang Cao and published by World Scientific. This book was released on 2013-06-13 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is aimed at advanced undergraduates, graduate students and other researchers who possess an introductory background in materials physics and/or chemistry, and an interest in the physical and chemical properties of novel materials, especially transition metal oxides.New materials often exhibit novel phenomena of great fundamental and technological importance. Contributing authors review the structural, physical and chemical properties of notable 4d- and 5d-transition metal oxides discovered over the last 10 years. These materials exhibit extraordinary physical properties that differ significantly from those of the heavily studied 3d-transition metal oxides, mainly due to the relatively strong influence of the spin-orbit interaction and orbital order in 4d- and 5d materials. The immense growth in publications addressing the physical properties of these novel materials underlines the need to document recent advances and the current state of this field. This book includes overviews of the current experimental situation concerning these materials.
Book Synopsis Synthetic and Dynamic Control in Strongly Correlated Transition Metal Oxides by : Samuel David Marks (Ph.D.)
Download or read book Synthetic and Dynamic Control in Strongly Correlated Transition Metal Oxides written by Samuel David Marks (Ph.D.) and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Binary and mixed oxides incorporating transition metal cations host a broad range of scientifically compelling and technologically significant optical, electronic, and magnetic properties. Transition metal oxides (TMOs) are being explored for applications in energy storage, optoelectronics, sensors, and magnetic storage among many other potential uses. The diverse range of physical properties within this class of materials arises from the large flexibility in chemical compositions and crystal structures. These compositions and structures can be generated during synthesis or tailored after synthesis with external stimuli. In this thesis, I develop strategies for reaching structural and chemical states in transition metal oxides with technologically important optical and electronic properties. I demonstrate a new synthesis strategy for single-crystal SrVO3 films - a transparent conducting oxide with potential applications in display and photovoltaic technologies - using solid-phase epitaxy. By this technique, epitaxial layers of SrVO3 are crystallized from amorphous precursor films. The electrical conductivity and visible light transmission in these epilayers are comparable with SrVO3 formed through other epitaxial synthesis methods. This synthesis route employs thin film deposition and crystallization techniques that are scalable to m2 surface areas. Scalability is a crucial step for commercial applications of transparent conducting oxide layers. Crystal growth from amorphous precursor films is a recent development for transition metal oxides that have traditionally been synthesized using vapor-phase epitaxy. As a result, fundamental insight into the amorphous-to-crystalline transformation and defect formation processes in solid-phase epitaxy for transition metal oxides is comparatively rare. In situ synchrotron x-ray characterization is a powerful experimental approach for gathering mechanistic insight for crystal growth processes. I have designed new instrumentation for synchrotron x-ray studies of the amorphous layer deposition, crystallization, and defect formation processes inherent to solid-phase epitaxy. This instrumentation combines a vacuum sample deposition and crystallization environment with x-ray focusing optics for in situ x-ray microbeam diffraction, reflectivity, and scattering studies. Design features and key capabilities are demonstrated through a series of results from experiments performed during the commissioning of the instrument at the Advanced Photon Source. In a separate ex-situ study, I examine the crystal structure of micrometer-scale regions of SrTiO3 crystallized from nanoscale seeds using lateral solid-phase crystallization. Using a high-energy synchrotron x-ray beam focused to 200 nm, I reveal a continuous rotation in the lattice planes in the laterally crystallized regions. A rotation of nearly 25[degrees] per micrometer of lateral crystallization is measured for several SrTiO3 crystals independent of the crystallographic orientation of the growth front. The uniform lattice rotation rate suggests a single defect formation process that is characteristic of lateral crystal growth through an amorphous precursor layer. These findings support a hypothesis that the lattice rotation is driven by dislocations that form in response to mechanical stresses arising from the density difference across the crystal-amorphous interface. Controlling the oxygen environment is crucial to forming specific structural phases during synthesis. Similarly, modifications to oxygen stoichiometry can be used to modify the physical properties in epitaxial thin films of multivalent transition metal oxides. In this project, I use x-ray nanobeam diffraction and scanning near-field optical microscopy to simultaneously probe the structural and optoelectronic features of oxygen-deficient epitaxial monoclinic vanadium dioxide thin-films. In this study, an electrically conductive phase is patterned in insulating vanadium dioxide using intense electric fields delivered from an atomic force microscope probe. Electrical conductivity arises from oxygen vacancies created in the presence of the electric field that modify the electronic band structure. The stability and relaxation of the electrically conducting state are governed by the oxygen vacancy dynamics that can be manipulated with hard x-ray irradiation. This study demonstrates a way to manipulate nanoscale structural and electronic states in vanadium dioxide with local electric fields and focused hard x-rays, bringing new insights into the stability of the oxygen-deficient conductive phase of vanadium dioxide.
Download or read book Metal Oxides written by J.L.G. Fierro and published by CRC Press. This book was released on 2005-08-24 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry of metals has traditionally been more understood than that of its oxides. As catalytic applications continue to grow in a variety of disciplines, Metal Oxides: Chemistry and Applications offers a timely account of transition-metal oxides (TMO), one of the most important classes of metal oxides, in the context of catalysis. The first part of the book examines the crystal and electronic structure, stoichiometry and composition, redox properties, acid-base character, and cation valence states, as well as new approaches to the preparation of ordered TMO with extended structure of texturally defined systems. The second part compiles some practical aspects of TMO applications in materials science, chemical sensing, analytical chemistry, solid-state chemistry, microelectronics, nanotechnology, environmental decontamination, and fuel cells. The book examines many types of reactions - such as dehydration, reduction, selective oxidations, olefin metathesis, VOC removal, photo- and electrocatalysis, and water splitting - to elucidate how chemical composition and optical, magnetic, and structural properties of oxides affect their surface reactivity in catalysis. Drawing insight from leading international experts, Metal Oxides: Chemistry and Applications is a comprehensive and interdisciplinary reference for researchers that may also be used by newcomers as a guide to the field.
Book Synopsis Thin Film Metal-Oxides by : Shriram Ramanathan
Download or read book Thin Film Metal-Oxides written by Shriram Ramanathan and published by Springer Science & Business Media. This book was released on 2009-12-03 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin Film Metal-Oxides provides a representative account of the fundamental structure-property relations in oxide thin films. Functional properties of thin film oxides are discussed in the context of applications in emerging electronics and renewable energy technologies. Readers will find a detailed description of deposition and characterization of metal oxide thin films, theoretical treatment of select properties and their functional performance in solid state devices, from leading researchers. Scientists and engineers involved with oxide semiconductors, electronic materials and alternative energy will find Thin Film Metal-Oxides a useful reference.
Book Synopsis Transition Metal Oxides by : Chintamani Nagesa Ramachandra Rao
Download or read book Transition Metal Oxides written by Chintamani Nagesa Ramachandra Rao and published by VCH Publishers. This book was released on 1995 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impurities in Antiferromagnetic Transition-metal Oxides, Symmetry and Optical Transitions by : John Emil Petersen (III)
Download or read book Impurities in Antiferromagnetic Transition-metal Oxides, Symmetry and Optical Transitions written by John Emil Petersen (III) and published by . This book was released on 2017 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of antiferromagnetic transition-metal oxides is an extremely active area in the physical sciences, where condensed matter physics, inorganic chemistry, and materials science blend together. The sheer number of potential commercial applications is staggering, but much of the fundamental science remains unexplained. This is not due to a lack of effort, however, as theorists have been struggling to understand these materials for decades – particularly the character of the band edges and first optical transitions. The difficulty lies in the strong correlation or Coloumb attraction between the electrons in the anisotropic d orbitals, which conventional band theory cannot describe adequately. The correlation problem is approached here by the well-accepted method of adding a Hubbard potential energy term to the ground state Hamiltonian, calculated within Density Functional Theory. The frequency-dependent complex dielectric function is calculated within the Independent Particle Approximation, and optical transitions are evaluated in multiple different ways. Peaks in the imaginary part of the dielectric function are compared energetically to orbitally decomposed density of states calculations. Optical transitions are typically analyzed in terms of atomic orbitals, which, strictly speaking, gives misleading results. Here, however, from the calculated data, two alternative interpretations are analyzed for each material studied. The first employs rigorous group theoretical analysis to determine allowed electric-dipole transitions, taking into account both orbital hybridization and crystal symmetry. The second interpretation is that of metal cation site hopping. In this interpretation, carriers hop from the x2 – y2 d orbital of one metal cation lattice site to the next metal cation site which is antiferromagnetically aligned. At times, thoughout this work, one interpretation is favorable to the other. Which interpretation is most valid depends on the material considered. For example, simple rock-salt transition-metal oxides are quite different from the high temperature superconducting cuprates. A range of materials is studied here, in order to gain a greater understanding of optical transitions in highly-correlated systems. In this work, O vacancies are introduced in NiO, along with Fe impurities, to understand better the band filling in the insulating behavior observed experimentally. These results are compared with those of La2NiO4, La2CuO4, La2-xSrxNiO4, and La2-xSrxCuO4. to elucidate the mechanisms behind the symmetry breaking phenomena in the Sr doped systems. As it turns out, indeed, the x2 – y2 orbital in these materials plays a critical role in spatial charge distribution, magnetic, and spin densities which are coupled to the dopant position in the lattice. The in-depth study of electronic and optical properties of transition-metal oxides presented here provides theoretical characterization of the infamous pseudogap in the cuprates – one of the greatest mysteries of modern solid state physics. In addition, via Density Functional Perturbation Theory, the phonon coupling with charge-density wave is explored in La2-xSrxNiO4 and found to be the dominant contributing factor to the colossal dielectric constant.
Book Synopsis Synthesis, structure and magnetic properties of complex metal oxides by : Christopher Sebastian Knee
Download or read book Synthesis, structure and magnetic properties of complex metal oxides written by Christopher Sebastian Knee and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure-property Relationships of Oxides with Hexagonal AMO3 and Brownmillerite Related Structures by : Peng Jiang
Download or read book Structure-property Relationships of Oxides with Hexagonal AMO3 and Brownmillerite Related Structures written by Peng Jiang and published by . This book was released on 2012 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition metal oxides exhibit potential in various application fields due to the special d-electrons. Solid state chemistry focuses on discovering the structure-property relationships. The work in this thesis mainly discusses compounds with hexagonal or brownmillerite-type structure and their practical properties. Hexagonal YIn[subscript 1-x]Fe[subscript x]O3 (x = 0-0.3, 0.7-1.0) phases have been prepared and characterized. All phases appear to have the ferroelectric structure known for YInO3. The color of the phases changes from yellow to orange to dark red with increasing Fe content. Magnetic measurements confirm high-spin Fe3 for all phases. Similarly, solid solution YAl[subscript 1-x]Fe[subscript x]O3 (x = 0-0.4, 0.7-1.0) phases were successfully synthesized through the sol-gel method. The Al-rich compounds present paraelectric YAlO3 structure while the Fe-rich side samples exhibit YFeO3 structure. The color of the compounds appear to be yellow with small Fe content and change to brown which has higher Fe content. Brownmillerite-type oxides Ba2In[subscript 2-x]Mn[subscript x]O[subscript 5+x] (x = 0.1-0.7) have been prepared and characterized. Magnetic measurements confirm that Mn in as prepared samples is substituting as Mn5 for all values of x with observed paramagnetic spin-only moments close to values expected for two unpaired electrons. Neutron diffraction structure refinements show Mn5+ occupies tetrahedral sites for orthorhombic (x = 0.1) and tetragonal (x = 0.2) phases. For Mn e"0.3 samples, neutron refinements show the phases are cubic with disordered cations and oxygen vacancies. The colors of the phases change from light yellow (x = 0) to intense turquoise (x =0.1), to green (x = 0.2, 0.3) or dark green (x e"0.4). Solid solution Ba2In[subscript 2-x]Fe[subscript x]O[subscript 5+y] (x = 0.1-1.5) also exhibit brownmillerite-type structure. The color of the compounds appear to be green with small Fe content and change to black with higher Fe content (x e"0.3). Magnetic measurements and Mössbauer spectroscopy conclude the mixed valence of Fe3+/Fe4+ for all the phases. Nonstoichiometry compound YCu0.6Ti0.4O[subscript 3-delta] has been prepared and characterized. Structure study indicates that oxygen vacancy is favored under the synthesis condition. This change in oxygen content was further studied in the Mn-doped system. And the effect of stoichiometric difference in the Mn-doped samples was not as obvious as the initial compound. The disorder in the cation site enhanced the tolerance of the structure in the aspect of oxygen content. The hexagonal phases LnCu0.5Ti0.5O3 (Ln = Y, Tb-Lu) phases were prepared by the traditional solid state reactions. The prepared compounds were reduced at high temperature in the reduction atmosphere created by the H2/N2 gas mixture. Study on the structure and properties changes by reduction was conducted by X-ray diffraction, optical measurement, magnetic measurement and thermalgravimetric analysis. And we observed some evidence of the presence of Cu+ in the reduced phase by these characterization methods. Solid solution YMn[subscript x]Ti[subscript y]O[subscript 3-delta] (y = 0.1-0.4) was successfully prepared through conventional solid state approach. All the samples showed hexagonal structure. But the structure transition from ferroelectric P63cm to paraelectric P63/mmc occurred when Ti amount is higher than 0.2. Based on the neutron diffraction refinement, the lattice expanded in the ab plane but contracted along the c axis direction.
Book Synopsis Synthesis and Structural, Magnetic, Thermal, and Transport Properties of Several Transition Metal Oxides and Arsenides by : Supriyo Das
Download or read book Synthesis and Structural, Magnetic, Thermal, and Transport Properties of Several Transition Metal Oxides and Arsenides written by Supriyo Das and published by . This book was released on 2010 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aspects of Phase Separation in Transition Metal Oxides by : Samuel B. Emery
Download or read book Aspects of Phase Separation in Transition Metal Oxides written by Samuel B. Emery and published by . This book was released on 2011 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Functional Metal Oxides by : Satishchandra Balkrishna Ogale
Download or read book Functional Metal Oxides written by Satishchandra Balkrishna Ogale and published by John Wiley & Sons. This book was released on 2013-11-08 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional oxides are used both as insulators and metallic conductors in key applications across all industrial sectors. This makes them attractive candidates in modern technology ? they make solar cells cheaper, computers more efficient and medical instrumentation more sensitive. Based on recent research, experts in the field describe novel materials, their properties and applications for energy systems, semiconductors, electronics, catalysts and thin films. This monograph is divided into 6 parts which allows the reader to find their topic of interest quickly and efficiently. * Magnetic Oxides * Dopants, Defects and Ferromagnetism in Metal Oxides * Ferroelectrics * Multiferroics * Interfaces and Magnetism * Devices and Applications This book is a valuable asset to materials scientists, solid state chemists, solid state physicists, as well as engineers in the electric and automotive industries.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt:
