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Author: Amber K. Choquette
Publisher:
ISBN:
Category : Ferroelectricity
Languages : en
Pages : 376
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Book Description
Perovskite oxides, which take the chemical formula ABO3, are a very versatile and interesting materials family, exhibiting properties that include ferroelectricity, ferromagnetism, mixed ionic/electronic conductivity, metal-insulator behavior and multiferroicity. Key to these functionalities is the network of BO6 corner-connected octahedra, which are known to distort and rotate, directly altering electronic and ferroic properties. By controlling the BO6 octahedral distortions and rotations through cationic substitutions, the use of strain engineering, or through the formation of superlattice structures, the functional properties of perovskites can be tuned. Motivating the use of structure-driven design in oxide heterostructures is the prediction of hybrid improper ferroelectricity in A'BO3/ABO3 superlattices. Two key design rules to realizing hybrid improper ferroelectricity are the growth of high quality superlattice structures with odd periodicities of the A / A' layers, and the control of the octahedral rotation pattern. My work explores the rotational response in perovskite oxides to strain and interface effects in thin films of RFeO3 (R = La, Eu). I demonstrate a synchrotron x-ray diffraction technique to identify the rotation pattern that is present in the films. I then establish substrate imprinting as a key tool for controlling the rotation patterns in heterostructures, providing a means to realize the necessary structural variants of the predicted hybrid improper ferroelectricity in superlattices. In addition, by pairing measured diffraction data with a structure factor calculation, I demonstrate how one can extract both A-site and oxygen atomic positions in single crystal perovskite oxide films. Finally, I show results from (LaFeO3)n/(EuFeO3)n superlattices (n = 1-5), synthesized to test the motivating predictions of hybrid improper ferroelectricity in oxide superlattices.
Author: Amber K. Choquette
Publisher:
ISBN:
Category : Ferroelectricity
Languages : en
Pages : 376
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Book Description
Perovskite oxides, which take the chemical formula ABO3, are a very versatile and interesting materials family, exhibiting properties that include ferroelectricity, ferromagnetism, mixed ionic/electronic conductivity, metal-insulator behavior and multiferroicity. Key to these functionalities is the network of BO6 corner-connected octahedra, which are known to distort and rotate, directly altering electronic and ferroic properties. By controlling the BO6 octahedral distortions and rotations through cationic substitutions, the use of strain engineering, or through the formation of superlattice structures, the functional properties of perovskites can be tuned. Motivating the use of structure-driven design in oxide heterostructures is the prediction of hybrid improper ferroelectricity in A'BO3/ABO3 superlattices. Two key design rules to realizing hybrid improper ferroelectricity are the growth of high quality superlattice structures with odd periodicities of the A / A' layers, and the control of the octahedral rotation pattern. My work explores the rotational response in perovskite oxides to strain and interface effects in thin films of RFeO3 (R = La, Eu). I demonstrate a synchrotron x-ray diffraction technique to identify the rotation pattern that is present in the films. I then establish substrate imprinting as a key tool for controlling the rotation patterns in heterostructures, providing a means to realize the necessary structural variants of the predicted hybrid improper ferroelectricity in superlattices. In addition, by pairing measured diffraction data with a structure factor calculation, I demonstrate how one can extract both A-site and oxygen atomic positions in single crystal perovskite oxide films. Finally, I show results from (LaFeO3)n/(EuFeO3)n superlattices (n = 1-5), synthesized to test the motivating predictions of hybrid improper ferroelectricity in oxide superlattices.
Author: Benjamin M. Lefler
Publisher:
ISBN:
Category : Fluoropolymers
Languages : en
Pages : 0
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Book Description
Topochemistry is the chemical modification of a material while preserving its crystalline integrity. In instances where bottom-up synthesis of a complex material may be difficult or impossible to control, topochemistry offers a precise route of engineering properties through post-synthesis treatment. My work applies fluoridation topochemistry to perovskite materials for spatial chemical and physical property modifications. Perovskite oxides - with the formula ABO3 in which A tends to be an alkali, alkaline earth, or rare earth metal, and B tends to be a transition or post-transition metal - offer a wide variety of tunable optoelectronic and magnetic properties. Lateral patterning of these properties can enable new architectures in oxide-based electronic, magnetic memory, spintronic, and ionic devices. I laterally pattern such properties in perovskite film SrFeO3-[delta] by combining photolithography with reduction/oxidation and fluoridation topochemistries to fabricate laterally-heterostructured films of SrFeO3, reduced SrFeO2.5, and fluoridated phase SrFeO2F. I also demonstrate that the chemical stability of SrFeO2F enables dynamically-control patterned properties through selective reversible redox chemistry of oxide phases. In a second, related yet quite different materials class, the hybrid organic/inorganic lead halide perovskites, I demonstrate that fluoridation topochemistry exerts strong influence over the dynamics of photoinduced charge carriers, with significant implications for photovoltaic devices. Issues in these materials arise from the weak bonding at crystalline surfaces and interfaces. I test the hypothesis that topochemically applied fluoride, selectively added at the surface of hybrid perovskite thin films improves surface chemistry through strong bonding. Under optimized conditions, fluoridation improves the photoinduced charge carrier lifetimes by three-fold. Meanwhile, "overfluoridation" leads to the generation of PbF2 which is identified herein to act as an electron-acceptor for the conduction band of the perovskite.
Author: Karl A. Mller
Publisher: World Scientific
ISBN: 9814317691
Category : Science
Languages : en
Pages : 583
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Book Description
In this book some 50 papers published by K A Mller as author or co-author over several decades, amplified by more recent work mainly by T W Kool with collaborators, are reproduced. The main subject is Electron Paramagnetic Resonance (EPR) applied to the study of perovskites and other oxides with related subjects. This wealth of papers is organized into eleven chapters, each with an introductory text written in the light of current understanding. The contributions of the first editor on structural phase transitions have been immense, and because K A Mller and J C Fayet have published a review paper on the subject, the latter is reproduced in chapter VII. Not related to EPR is a part of chapter VIII on the dipolar and quantum paraelectric behavior with dielectric studies. in chapter X two papers proving the existence of Fermi glasses are reproduced. The year 1986 bears some significance: early in this year the paper by Bednorz and Mller on the possible observation of superconductivity was published. This resulted in a substantial shift in the paradigm of condensed matter physics, to which the present first editor has contributed scientifically with others and which will be reviewed in a second volume.
Author: Gertjan Koster
Publisher: Woodhead Publishing
ISBN: 0081029462
Category : Science
Languages : en
Pages : 534
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Book Description
Epitaxial Growth of Complex Metal Oxides, Second Edition reviews techniques and recent developments in the fabrication quality of complex metal oxides, which are facilitating advances in electronic, magnetic and optical applications. Sections review the key techniques involved in the epitaxial growth of complex metal oxides and explore the effects of strain and stoichiometry on crystal structure and related properties in thin film oxides. Finally, the book concludes by discussing selected examples of important applications of complex metal oxide thin films, including optoelectronics, batteries, spintronics and neuromorphic applications. This new edition has been fully updated, with brand new chapters on topics such as atomic layer deposition, interfaces, STEM-EELs, and the epitaxial growth of multiferroics, ferroelectrics and nanocomposites. - Examines the techniques used in epitaxial thin film growth for complex oxides, including atomic layer deposition, sputtering techniques, molecular beam epitaxy, and chemical solution deposition techniques - Reviews materials design strategies and materials property analysis methods, including the impacts of defects, strain, interfaces and stoichiometry - Describes key applications of epitaxially grown metal oxides, including optoelectronics, batteries, spintronics and neuromorphic applications
Author: Stefano Crespi
Publisher: Royal Society of Chemistry
ISBN: 183916767X
Category : Science
Languages : en
Pages : 553
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Book Description
This annual review, the 50th volume in the series, provides critical analysis for anyone wanting to keep up to date with the literature on photochemistry and its applications. This essential volume combines reviews on the latest advances in photochemical research with specific topical highlights in the field. The volume starts with periodical reports of the recent literature on organic and computational aspects, including computational advances in photochemistry, chemiluminescence and dark photochemistry, organic aspects of photochemistry of alkenes, dienes and polyenes, aromatic compounds, oxygen-containing functions and those functions containing other heteroatoms, and finally a chapter on transition metal catalysis. Coverage continues in the second part with highlighted topics including photochemical tools for sensing and controlling biological processes, visible light driven enantioselective processes, photochemical formation of C–Chalcogen bonds, photoelectrocatalysis, photovoltaic techniques, photochemical activation of aryl chlorides, luminescent water-soluble systems and computational analyses of fluorescence absorption spectra. This volume will again include a third section entitled ‘SPR Lectures on Photochemistry’, providing examples for academic readers to introduce a photochemistry topic and precious help for students in photochemistry.
Author: Nam-Gyu Park
Publisher: Springer
ISBN: 9783319351124
Category : Science
Languages : en
Pages : 366
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Book Description
This book covers fundamentals of organometal perovskite materials and their photovoltaics, including materials preparation and device fabrications. Special emphasis is given to halide perovskites. The opto-electronic properties of perovskite materials and recent progress in perovskite solar cells are described. In addition, comments on the issues to current and future challenges are mentioned.
Author: Li Wei
Publisher: John Wiley & Sons
ISBN: 3527344314
Category : Science
Languages : en
Pages : 290
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Book Description
Hybrid organic-inorganic perovskites (HOIPs) have attracted substantial interest due to their chemical variability, structural diversity and favorable physical properties the past decade. This materials class encompasses other important families such as formates, azides, dicyanamides, cyanides and dicyanometallates. The book summarizes the chemical variability and structural diversity of all known hybrid organic-inorganic perovskites subclasses including halides, azides, formates, dicyanamides, cyanides and dicyanometallates. It also presents a comprehensive account of their intriguing physical properties, including photovoltaic, optoelectronic, dielectric, magnetic, ferroelectric, ferroelastic and multiferroic properties. Moreover, the current challenges and future opportunities in this exciting field are also been discussed. This timely book shows the readers a complete landscape of hybrid organic-inorganic pervoskites and associated multifuctionalities.
Author: Tze-Chien Sum
Publisher: John Wiley & Sons
ISBN: 3527341110
Category : Technology & Engineering
Languages : en
Pages : 312
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Book Description
Real insight from leading experts in the field into the causes of the unique photovoltaic performance of perovskite solar cells, describing the fundamentals of perovskite materials and device architectures. The authors cover materials research and development, device fabrication and engineering methodologies, as well as current knowledge extending beyond perovskite photovoltaics, such as the novel spin physics and multiferroic properties of this family of materials. Aimed at a better and clearer understanding of the latest developments in the hybrid perovskite field, this is a must-have for material scientists, chemists, physicists and engineers entering or already working in this booming field.
Author: Aparna Thankappan
Publisher: Academic Press
ISBN: 0128129166
Category : Technology & Engineering
Languages : en
Pages : 521
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Book Description
Perovskite Photovoltaics: Basic to Advanced Concepts and Implementation examines the emergence of perovskite photovoltaics, associated challenges and opportunities, and how to achieve broader development. Consolidating developments in perovskite photovoltaics, including recent progress solar cells, this text also highlights advances and the research necessary for sustaining energy. Addressing different photovoltaics fields with tailored content for what makes perovskite solar cells suitable, and including commercialization examples of large-scale perovskite solar technology. The book also contains a detailed analysis of the implementation and economic viability of perovskite solar cells, highlighting what photovoltaic devices need to be generated by low cost, non-toxic, earth abundant materials using environmentally scalable processes. This book is a valuable resource engineers, scientists and researchers, and all those who wish to broaden their knowledge on flexible perovskite solar cells. - Includes contributions by leading solar cell academics, industrialists, researchers and institutions across the globe - Addresses different photovoltaics fields with tailored content for what makes perovskite solar cells different - Provides commercialization examples of large-scale perovskite solar technology, giving users detailed analysis on the implementation, technical challenges and economic viability of perovskite solar cells
Author: Kenneth D. Karlin
Publisher: John Wiley & Sons
ISBN: 0470167068
Category : Science
Languages : en
Pages : 616
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Book Description
Straight from the frontier of scientific investigation . . . Nowhere is creative scientific talent busier than in the world of inorganic chemistry. And the respected Progress in Inorganic Chemistry series has long served as an exciting showcase for new research in this area. With contributions from internationally renowned chemists, this latest volume reports the most recent advances in the field, providing a fascinating window on the emerging state of the science. "This series is distinguished not only by its scope and breadth, but also by the depth and quality of the reviews." —Journal of the American Chemical Society "[This series] has won a deservedly honored place on the bookshelf of the chemist attempting to keep afloat in the torrent of original papers on inorganic chemistry." —Chemistry in Britain CONTENTS OF VOLUME 48: Synthesis, Structure, and Properties of Organic-Inorganic Perovskites and Related Materials (David B. Mitzi, IBM T. J. Watson Research Center, Yorktown Heights, New York). Transition Metals in Polymeric 1 - Conjugated Organic Frameworks (Richard P. Kingsborough and Timothy M. Swager, Massachusetts Institute of Technology, Cambridge, Massachusetts). The Transition Metal Coordination Chemistry of Hemilabile Ligands (Caroline S. Slone, Dana A. Weinberger, and Chad A. Mirkin, Northwestern University, Evanston, Illinois). Organometallic Fluorides of the Main Group Metals Containing the C-M-F Fragment (Balaji R. Jagirdar, Eamonn F. Murphy, and Herbert W. Roesky, Universität Göttingen, Germany). Coordination Complex Impregnated Molecular Sieves-Synthesis, Characterization, Reactivity, and Catalysis (Partha P. Paul, Southwest Research Institute, San Antonio, Texas). Advances in Metal Boryl and Metal-Mediated B-X Activation Chemistry (Milton R. Smith III, Michigan State University, East Lansing, Michigan).
