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Book Functional Transport Properties in Complex Transition Metal Oxides

Download or read book Functional Transport Properties in Complex Transition Metal Oxides written by Hee Taek Yi and published by . This book was released on 2010 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition oxide materials have a long and high-flying history due to their attractive properties. They are well-known today for magnets, high temperature superconductors as well as promising electronic materials. For example, BaTiO3 and PbZrTiO3 are famous piezoelectric materials that are used in Micro-electric-mechanical system devices and VO2, a metal insulator transition material with a threshold temperature of 70 degrees is used to prevent over-heating of devices such as batteries. Herein, I address the newly investigated noble transport properties in (1) perovskite (La, Pr, Ca)MnO3 as a cryogenic non-volatile random access memory by using the phase change between charge-ordered insulating state and ferromagnetic metallic state, (2) ferroelectric BiFeO3: switchable photovoltaic effect by switching the poling direction of the sample. I also explored the newly investigated multiferroic property in transition metal compound Ca3Co2-xMnxO6 as well as the giant magnetic coercivity change induced by co-operative freezing in Ca3Co2O6.

Book Functional Oxides

Download or read book Functional Oxides written by Duncan W. Bruce and published by John Wiley & Sons. This book was released on 2011-03-29 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional oxides have a wide variety of applications in the electronic industry. The discovery of new metal oxides with interesting and useful properties continues to drive much research in chemistry, physics, and materials science. In Functional Oxides five topical areas have been selected to illustrate the importance of metal oxides in modern materials chemistry: Noncentrosymmetric Inorganic Oxide Materials Geometrically Frustrated Magnetic Materials Lithium Ion Conduction in Oxides Thermoelectric Oxides Transition Metal Oxides - Magnetoresistance and Half-Metallicity The contents highlight structural chemistry, magnetic and electronic properties, ionic conduction and other emerging areas of importance, such as thermoelectricity and spintronics. Functional Oxides covers these complex concepts in a clear and accessible manner providing an excellent introduction to this broad subject area.

Book Transport Properties of Some Transition Metal Oxides

Download or read book Transport Properties of Some Transition Metal Oxides written by Fred Barrie Lewis and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Transport Properties of Some Transition Metal Oxides

Download or read book Transport Properties of Some Transition Metal Oxides written by Fred Barrie Lewis and published by . This book was released on 1975 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Functional Metal Oxides

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.

Book Electronic Magnetic and Topological Properties of Transition Metal Oxides

Download or read book Electronic Magnetic and Topological Properties of Transition Metal Oxides written by Yundi Quan and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition metal oxides have been the ideal platform for designing materials with exotic properties due to the complex interplay between spin, charge,and orbital degrees of freedom which can be fine-tuned by varying pressure, temperature, and external magnetic field to give rise to novel phases. Transition metal oxides are also a challenge from the theoretical point of view. The (semi)local density approximation for the exchange correlation functional that is often used in density functional calculations fails to adequately describe the many-body effects of 3dand 4f electrons thereby leading tounderestimated band gaps. Several techniques, such as hybrid functionals, dynamical mean field theory, and DFT+U, have been developed over the past few decades to account for the many-body effects of 3d and 4f electrons. The DFT+U method, which will be used extensively throughout this thesis, has proved to be very successful in modeling gap opening, structure optimization and predicting transport properties. Rare earth nickelates have attracted a lot of attention in recent years due to their complex phase diagram that arises from the competition between spin, charge, and orbital degrees of freedom. Of particular interest is the metal-insulator transition that occurs upon cooling for RNiO3 (R=rare earth, except for La) which was found to be accompanied by symmetry lowering, later theorized as the evidence for charge ordering. By using first principles calculations, we found that the charge difference between Ni ions in the "charge-ordered" phase is negligibly small, while various aspects such as core energy levels, spectral weight immediately above and below the Fermi level, and magnetic moments do differ. Using Wannier function analysis, the charge states of Ni ions in the lower symmetry structure are systematically studied and found to correlated to the number of Wannier charge centers at the Ni site. The same approach was applied to study the charge states of Ag[superscript]I and Ag[superscript]III in AgO. Another interesting aspect of transition metal oxides is their topological properties that are attracting much attention in recent years. The semi-Dirac point, first discovered by Pardo et al and later modeled by Banerjee et al, has linear dispersion along the diagonal and quadratic dispersion perpendicular to the diagonal. In this thesis, we revisit the tight-binding Hamiltonian proposed by Banerjee and extend it to include the effects of external magnetic fieldon the energy spectrum and topological properties. We also discuss the forms of effective model Hamiltonians that can generate non-zero Berry phase. First principles calculations have been successful in guiding the experimental search for high T[subscript]c superconductors, the most recent example being high T[subscript]c (203K) superconductor H3S under pressure (200GPa). The superconductivity of H3S was first predicted by Duan et al using DFT combined with structure optimization algorithms and validated soon after. Though elemental hydrogen was predicted to metallize under pressure in 1930, it was not realized until recently that hydrogen based compounds rather than pure hydrogen atoms are better candidates for high T[subscript]c superconductors. In this thesis, we carried out first principle calculations to study the unusual van Hove singularities located near the Fermi level that lead to a sharp peak, and analyzed the hybridization between sulfur and hydrogen states by constructing a tight-binding model.

Book NBS Special Publication

Download or read book NBS Special Publication written by and published by . This book was released on 1978 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Functional Transition Metal Oxides

Download or read book Functional Transition Metal Oxides written by Andrew Earnest Smith and published by . This book was released on 2011 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition metal oxides are an important class of materials for the wide variety optical, electrical, dielectric, magnetic, and thermal properties observed. Their unique structure-property relationships allow for property tuning and often provide insight into the fundamentals of chemistry. The work in this thesis was focused on the design, synthesis and physical property characterization of novel materials with applications in mind. In particular, magneto-electric multiferroics and spintronics are a promising technology for applications in many areas of electronics where either the magnetic or electric properties can be manipulated with electric or magnetic fields respectively. La2MnRhO6 thin films were found to exhibit a change in the defect structure, surface morphology, and magnetic properties for films grown at different oxygen pressures revealing the importance of deposition methods. Bulk ceramic of La2MRhO6 (M = Cr, Mn, Fe, Co, Ni and Cu) were characterized and all were found to be orthorhombic p-type semiconductors. Unique magnetism was found for M = Fe and Cr with both showing magnetic hysteresis at 5K. The Cu analogue is likely to be in a 2+/3+ oxidation state, and showed a favorable power factor up to ~575 K. LaCo[subscript 1-x]Rh[subscript x]O3 compositions were found to exhibit an interesting lattice crossover at x = 0.5. Strong evidence for at least some conversion of Rh3+/Co3+ to Rh4+/Co2+ is found in both structural and electrical transport data. A thermoelectric figure-of-merit (ZT) of about 0.075 has been achieved for LaCo0.5Rh0.5O3 at 775 K YMnO3 is a well known magneto-electric material, and in our study, we have prepared complete or nearly complete solid solutions with YInO3, YAlO3, and YCu0.5Ti0.5O3 systems in order to better understand the structure-property relationships. Our results indicate exciting optical properties as a wide range of blue was observed in the YInO3 solid solution, the intensity of which was critically dependent on the apical bond distances and the crystal field splitting. The YInO3 and YCu0.5Ti0.5O3 systems showed magnetic and magneto-electric suppression for increasing values as expected, but the field dependent capacitance for YInO3 showed a unique improvement and sign swap indicating a strong magneto-electric coupling. We determined the YAlO3 structure to have been improperly reported based on bond valence calculations. Our investigation into the YAlO3-YMnO3 system is underway, however we believe a carbonate group exists within the basal plane resulting in a chemical formula such as YAl[subscript 1-x]Mn[subscript x]O[subscript 3-y](CO3)[subscript y]. For the high-k dielectric CaCu[subscript 3-x]Mn[subscript x]Ti[subscript 4-y]Fe[subscript y]O12 and CaCu3Ti4O[subscript 12-x]F[subscript x], the limits of x, y were determined. A structural study on ceramic samples determined single phase materials, and dielectric measurements showed improvement of properties for fluorinated samples with the dielectric loss lowered while maintaining a high dielectric constant. It is likely that F may be concentrating on important planar defect sites. A colossal decrease in the dielectric constant was observed for Mn-Fe co-doped samples and provides insight into dual site occupations of dopants.

Book Oxide Electronics and Functional Properties of Transition Metal Oxides

Download or read book Oxide Electronics and Functional Properties of Transition Metal Oxides written by Alexander Pergament and published by Nova Science Publishers. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) for a long time have been the workhorse of the modern electronics industry. For the purpose of a permanent integration enhancement, the size of a MOSFET has been decreasing exponentially for decades in compliance with Moore's Law, but nowadays, owing to the intrinsic restrictions, the further scaling of MOSFET devices either encounters fundamental (e.g. quantum-mechanical) limits or demands for more and more sophisticated and expensive engineering solutions. Alternative approaches and device concepts are being currently designed both in order to sustain an increase of the integration degree, and to improve the functionality and performance of electronic devices. Oxide electronics is one such promising approach which could enable and accelerate the development of information and computing technology. The behavior of d-electrons in transition metal oxides (TMOs) is responsible for the unique properties of these materials, causing strong electron-electron correlations, which play an important role in the mechanism of metal-insulator transition. The Mott transition in vanadium dioxide is specifically the effect that researchers consider as one of the most promising phenomena for oxide electronics, particularly in its special direction known as a Mott-transition field-effect transistor (MTFET).

Book Transition Metal Oxides for Electrochemical Energy Storage

Download or read book Transition Metal Oxides for Electrochemical Energy Storage written by Jagjit Nanda and published by John Wiley & Sons. This book was released on 2022-03-28 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition Metal Oxides for Electrochemical Energy Storage Explore this authoritative handbook on transition metal oxides for energy storage Metal oxides have become one of the most important classes of materials in energy storage and conversion. They continue to have tremendous potential for research into new materials and devices in a wide variety of fields. Transition Metal Oxides for Electrochemical Energy Storage delivers an insightful, concise, and focused exploration of the science and applications of metal oxides in intercalation-based batteries, solid electrolytes for ionic conduction, pseudocapacitive charge storage, transport and 3D architectures and interfacial phenomena and defects. The book serves as a one-stop reference for materials researchers seeking foundational and applied knowledge of the titled material classes. Transition Metal Oxides offers readers in-depth information covering electrochemistry, morphology, and both in situ and in operando characterization. It also provides novel approaches to transition metal oxide-enabled energy storage, like interface engineering and three-dimensional nanoarchitectures. Readers will also benefit from the inclusion of: A thorough introduction to the landscape and solid-state chemistry of transition metal oxides for energy storage An exploration of electrochemical energy storage mechanisms in transition metal oxides, including intercalation, pseudocapacitance, and conversion Practical discussions of the electrochemistry of transition metal oxides, including oxide/electrolyte interfaces and energy storage in aqueous electrolytes An examination of the characterization of transition metal oxides for energy storage Perfect for materials scientists, electrochemists, inorganic chemists, and applied physicists, Transition Metal Oxides for Electrochemical Energy Storage will also earn a place in the libraries of engineers in power technology and professions working in the electrotechnical industry seeking a one-stop reference on transition metal oxides for energy storage.

Book Numerical Study of the Transition Metal Oxides and Transport Properties of Iron Pnictides

Download or read book Numerical Study of the Transition Metal Oxides and Transport Properties of Iron Pnictides written by Shuhua Liang and published by . This book was released on 2012 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strongly correlated materials such as the manganites and iron pnictides are studied here with several computational techniques. Both types of materials contain transition metals. Thus, our computational models are based on the double exchange mechanism, the super exchange mechanism and the crystal field theory to describe the d electrons. In manganites, we focus on its multiferroic properties induced by the Dzyaloshinskii-Moriya interaction. In the BiFeO3, we use classical Monte Carlo simulations to study the magnetic critical transition transition. In iron pnictides, we study the interplay between the Fermi surface orbital order and the ground state magnetic order.

Book Frontiers of 4D and 5D transition Metal Oxides

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 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 Transition Metal Oxides

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.