Polar Oxides
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Polar Oxides
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Author : Rainer Waser
language : en
Publisher: John Wiley & Sons
Release Date : 2006-03-06
Polar Oxides written by Rainer Waser and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-03-06 with Technology & Engineering categories.
Here, more than 20 experts from leading research institutes around the world present the entire scope of this rapidly developing field. In so doing, they cover a wide range of topics, including the characterization and investigation of structural, dielectric and piezoelectric properties of ceramic materials, a well as phase transitions, electrical and optical properties and microscopic investigations. Another feature is a complete profile of the properties of polar oxides -- from their proof to their latest applications. Throughout, the authors review, discuss and assess the material properties with regard to new and advanced characterization and imaging techniques. For physicists, physicochemists, semiconductor and solid state physicists, materials scientists, and students of chemistry and physics.
Synthesis Structure Characterization And Functional Properties Of New Mixed Metal Polar Oxides
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Author : Sau Doan Nguyen
language : en
Publisher:
Release Date : 2012
Synthesis Structure Characterization And Functional Properties Of New Mixed Metal Polar Oxides written by Sau Doan Nguyen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Inorganic and solid state chemistry categories.
Functional polar oxide materials occupy a very crucial position in modern technology. The polar oxide materials exhibit many technologically important properties like second-harmonic generation, piezoelectricity, pyroelectricity, and possibly ferroelectricity caused by their polar crystal structure. Though the structure-property relationship in polar oxide materials is well studied, the understanding of how the structural building units are joined to form a new polar crystal structure has been less sufficient. A synthetic approach using cations susceptible to second-order Jahn Teller (SOJT) distortion like octahedrally coordinated d0 cations (Ti4+, V5+, Mo6+) and lone-pair cations (Sn2+, Sb3+, Te4+) is successful in preparing new polar oxide materials. We were successful in preparing several new polar oxide materials, Zn2(MoO4)(AO3) (A = Se4+, Te4+) (P21), BiO(IO3) (Pca21), Li6(Mo2O5)3(SeO3)6 (Pmn21), Na2(WO3)3(SeO3)2H2O (P31c), and Na6(W6O19)(SeO3)2 (C2) and other centrosymmetric materials, Li2(MO4)(TeO3)2 (M = Mo6+, W6+) (P21/n). In this dissertation, we report the syntheses, crystal structures, physical properties, functional properties, and understanding of the structure-property relationship of the reported oxide materials.
Thin Film Polar Oxides For Heterogeneous Catalysis
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Author : Adam Martin Kerrigan
language : en
Publisher:
Release Date : 2020
Thin Film Polar Oxides For Heterogeneous Catalysis written by Adam Martin Kerrigan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Transmission Electron Microscopy Studies Of Surface Phenomena In Polar Oxides
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Author : Arun Kumar Subramanian
language : en
Publisher:
Release Date : 2005
Transmission Electron Microscopy Studies Of Surface Phenomena In Polar Oxides written by Arun Kumar Subramanian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Atomic scale processes at surfaces dictate the macroscopic properties of solid surfaces and have been the subject of numerous theoretical and experimental studies. Polar surfaces, due to their non-vanishing dipole moment along the surface normal, are unstable from classic electrostatics arguments. The ionic model often used to describe this class of materials falls short in explaining the experimental observations of stable polar surfaces. A change in the electronic structure of the surface has been proposed as a stabilization mechanism, but until this study has not been experimentally verified. The research approach described in this manuscript involves a combination of computational (Direct Methods) and experimental (TEM) methods for investigation of polar oxide surface structures. The results from the studies of the surfaces of three different polar oxides, namely MgO (111), NiO (111) and SrTiO3 (110), are presented in this dissertation. The atomic structure and charge density of the MgO (111)- 3 x 3 R30° reconstruction has been experimentally measured and verified by ab initio calculations. The structure and densities of two other reconstructions on the NiO (111) surface, namely the ( 3 x 3 R30°) and (2 x 2), are also presented. The phase transition between these two surface phases of NiO is accompanied by a novel step ordering pheneomenon and is documented using TEM and SEM. Finally, the results from the studies of the atomic structure of the SrTiO3 (110)-3 x 4 surface reveal similarities with another surface structure (SrTiO3 (100)-c(6 x 2)).
Coupled Phenomena In Domains And Domain Walls In Complex Polar Oxides
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Author : Shiming Lei
language : en
Publisher:
Release Date : 2017
Coupled Phenomena In Domains And Domain Walls In Complex Polar Oxides written by Shiming Lei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Complex oxides represent a family of solid state materials that possesses a wide spectrum of properties, such as ferroelectricity, ferromagnetism, superconductivity, colossal magnetoresistance, large nonlinear optical response and metal-to-insulator transition. One type of such materials in the focus of the current work is polar materials, where the charge centers of the anions and cations are shifted relative to each other. The criteria whether the polar-axis exists or not thus divides all materials into two type polar or nonpolar. From the symmetry point of view, the appearance of polar axis or inversion symmetry breaking naturally leads to a crystal lattice with lower symmetry and the introduction of a certain order, just like the phase transformation from water to ice. The appearance of domain microstructure is a direct consequence when such symmetry lowering process happens. It is the existence of domain structure, its tunability, and its ability to couple with other order parameters that gives rise to a plethora of interesting coupled phenomena and make polar materials extremely useful for a wide range of applications. The rich coupled phenomena and their mechanisms are the center focus of this work.In Chapter 2, a systematic finite element modeling (FEM) approach was applied in understanding the quantitative piezoelectric origin of piezoresponse force microscopy (PFM) response across a 180 domain walls. Using FEM simulations, the coupled PFM response from each individual piezoelectric coefficient is conveniently decoupled, thus building a bridge between the measured PFM response and intrinsic piezoelectric properties of a ferroelectric material. In order to understand the coupled piezoresponse across domain walls, complete three-component piezoresponse line-profiles are calculated, allowing a direct comparison with experiments. While excellent agreement is achieved on vertical PFM (VPFM) response between experiments and theory, less satisfactory agreement is found in the lateral PFM (LPFM) response. Additionally, a new component of piezoresponse is predicted near the wall. A new approach to evaluate the tip-sample contact radius is also proposed and verified experimentally.In Chapter 3, based on the domain wall symmetry argument, a decoupling treatment of VPFM response is proposed and experimentally demonstrated to isolate the in-plane and out-of-plane piezoresponse contribution, thus allowing the achievement of three-dimensional piezoresponse from a single imaging geometry. The experimental VPFM and LPFM line-profiles after decoupling treatment show good agreements with the predicted ones from FEM simulations. In this Chapter, the background subtraction process is also demonstrated to be critical in reproducing the intrinsic piezoresponse phase contrast across the antiparallel domain wall. In Chapter 4, a first direct observation of ferroelectric-like polar domains in a polar metal is provided. The quasi-two-dimensional polar domain has large aspect ratio of ~103-104. This is beyond the domain geometry described by the general Kittel-Mitsui-Furuichi law, which gives the aspect ratio of ~10. The appearance of polar domains in a polar metal is found to be related to the geometric effect rather than the electrostatic effect from DFT calculations. The large aspect ratio of polar domains is found to be related to the reduced electrostatic energy due to the effective electronic screening. This suggests the role of conducting carriers in stabilizing the quasi-two-dimensional geometry of polar domains. Importantly, a first-order quasi-phase-matching effect is demonstrated on thin polar domains (thickness ~10 nm), paving a route to mirror-less optical parametric oscillators using the first-order quasi-phase-matching effect.In Chapter 5, results of detailed second harmonic generation, resistivity, specific heat, magnetization and neutron diffraction studies are provided to give a comprehensive picture on the magnetic phase diagrams for a polar material Ca3(Ru0.95Fe0.05)2O7. Although the polar mechanism is driven by the hybrid improper mechanism and the structure is also isostructural to the prototype material Ca3Mn2O7, the magnetoelastic coupling mechanism shows distinctively different behaviors from that in Ca3Mn2O7. The coexistence of weak ferromagnetism and magnetoelastic coupling in the polar material Ca3(Ru0.95Fe0.05)2O7 suggests a new route for ME coupling: an improper polar lattice distortion plus the metastable incommensurate weak ferromagnetic orderIn Chapter 6, I propose two future research topics based on some preliminary results that can be further pursued for better understanding on the domains/domain walls involved coupling phenomena. Two material systems are proposed for these future works, one is a tetragonal ferroelectric PbTiO3 and the other one is a polar metal Ca3Ru2O7. Theoretical studies such as phase-field simulations and DFT calculations are proposed as well to provide guidance on practical experiment design and lend theoretical support for the experimental observations.
Integration Of High K And Polar Oxides With Gan
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Author : Peter James Hansen
language : en
Publisher:
Release Date : 2004
Integration Of High K And Polar Oxides With Gan written by Peter James Hansen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Epitaxy Of Polar Oxides And Semiconductors
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Author : Christopher Tyrel Shelton
language : en
Publisher:
Release Date : 2016
Epitaxy Of Polar Oxides And Semiconductors written by Christopher Tyrel Shelton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Surface Structures Of Polar And Non Polar Metal Oxides
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Author : Sara E. Chamberlin
language : en
Publisher:
Release Date : 2011
Surface Structures Of Polar And Non Polar Metal Oxides written by Sara E. Chamberlin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Metallic oxides categories.
Oxide Surfaces
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Author :
language : en
Publisher: Elsevier
Release Date : 2001-05-21
Oxide Surfaces written by and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-05-21 with Science categories.
The book is a multi-author survey (in 15 chapters) of the current state of knowledge and recent developments in our understanding of oxide surfaces. The author list includes most of the acknowledged world experts in this field. The material covered includes fundamental theory and experimental studies of the geometrical, vibrational and electronic structure of such surfaces, but with a special emphasis on the chemical properties and associated reactivity. The main focus is on metal oxides but coverage extends from 'simple' rocksalt materials such as MgO through to complex transition metal oxides with different valencies.
The Surface Science Of Metal Oxides
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Author : Victor E. Henrich
language : en
Publisher: Cambridge University Press
Release Date : 1994
The Surface Science Of Metal Oxides written by Victor E. Henrich and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Science categories.
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