Download or read book Characterization of Native Point Defects in Barium Strontium Titanate written by Kyle Marshall McNicholas and published by . This book was released on 2012 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this study Ba0.5Sr0.5TiO3 (BST) thin films were grown on (100) oriented SrTiO3 (STO) substrates using molecular beam epitaxy. The BST films were produced under varying conditions with substrate temperature ranging from 700 °C to 900 °C, nominal oxygen background pressures ranging from ~0 Torr to 1E-6 Torr, and with an oxygen environment ranging from a 200 W plasma to an ambient O2 atmosphere. The films were analyzed using a multitude of techniques including depth resolved cathodoluminescence spectroscopy (DRCLS) surface photovoltage spectroscopy (SPS), atomic force microscopy (AFM), and x-ray diffraction (XRD). The DRCLS spectra obtained from the films display well-resolved emissions at 1.9 eV, 2.1 eV, 2.26 eV, 2.95 eV, and 3.5 eV. Surface photovoltage spectroscopy results correlate well with the emissions observed in the DRCLS and allow for the assignment of the positions of these defect states within the BST band gap. Furthermore, several trends are observed correlating the nature of the 2.9 eV emission to an oxygen related defect.
Download or read book Point Defects in Strontium and Barium Titanate from First Principles written by Jonathon Neal Baker and published by . This book was released on 2018 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Formation and Diffusion of Point Defects in Strontium Titanate written by Leon Clinton Walters and published by . This book was released on 1966 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Formation and Diffusion of Point Defects in Strontium Titanate written by Leon Clinton Walters and published by . This book was released on 1966 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth and Characterization of Barium Strontium Titanate BST Thin Films written by Gregory Shuster and published by . This book was released on 2008 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth and Characterization of Barium Strontium Titanate Thin Films by Metal Organic Decomposition written by Pradeep Jana and published by . This book was released on 1998 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth and Characterization of Barium Strontium Titanate Thin Films with Enhanced Electrical Properties Using Pulsed Laser Deposition written by Anuranjan Srivastava and published by . This book was released on 1999 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Applications of Barium Strontium Titanate Thin Film Structures written by Supriya Ashok Ketkar and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Barium Strontium Titanate (BST) based ferroelectric thin film devices have been popular over the last decade due to their versatile applications in tunable microwave devices such as delay lines, resonators, phase shifters, and varactors. BST thin films are promising candidates due to their high dielectric constant, tunability and low dielectric loss. Dielectric-tunable properties of BST films deposited by different deposition techniques have been reported which study the effects of factors, such as oxygen vacancies, film thickness, grain size, Ba/Sr ratio, etc. Researchers have also studied doping concentrations, high temperature annealing and multilayer structures to attain higher tunability and lower loss. The aim of this investigation was to study material properties of Barium Strontium Titanate from a comprehensive point of view to establish relations between various growth techniques and the film physical and electrical properties. The primary goal of this investigation was to synthesize and characterize RF magnetron sputtered Barium Strontium Titanate (Ba1-xSrxTiO3), thin film structures and compare their properties with BST thin films deposited by sol-gel method with the aim of determining relationships between the oxide deposition parameters, the film structure, and the electric field dependence. In order to achieve higher thickness and ease of fabrication, and faster turn around time, a [grave]stacked' deposition process was adopted, wherein a thin film (around 200nm) of BST was first deposited by RF magnetron sputtering process followed by a sol-gel deposition process to achieve higher thickness. The investigation intends to bridge the knowledge gap associated with the dependence of thickness variation with respect to the tunability of the films. The film structures obtained using the three different deposition methods were also compared with respect to their analytical and electrical properties.
Download or read book Atomic scale Characterization of Grain Boundaries in Strontium Titanate written by Pradyumna Laxman Prabhumirashi and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: I believe that the proposed defect design approach and analysis protocol would open new pathways to tailor the electronic properties of next generation devices, with an appropriate control over oxygen defects via solute doping and thermal treatment schemes.
Download or read book Design Assembly and Characterization of Three dimensional Photonic Band Gap Structures Fabricated with Barium Titanate Strontium Titanate Barium Zirconate Mixtures written by Sarosh Srikanth Nadkarni and published by . This book was released on 2006 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scope and method of study. Ternary mixtures of barium titanate (BT), strontium titanate (ST) and barium zirconate (BZ) were investigated as materials for three-dimensional, periodic, layer-by-layer structures used as photonic crystals. Highly concentrated aqueous based ceramic gels were formulated using colloidal processing and printed using an extrusion based direct write technique called robocasting. Bulk films with a range of molar ratios were printed and their electrical characteristics determined at low frequencies to develop composition-properties maps. Based on this data, face centered tetragonal lattices were printed with varying compositions and their frequency dependent transmission spectra determined using time domain terahertz spectroscopy. The experimentally obtained band structures were compared to those obtained by modeling using the transfer matrix method.
Download or read book The Defect Chemistry of Metal Oxides written by Donald Morgan Smyth and published by Oxford University Press on Demand. This book was released on 2000 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Defect Chemistry of Metal Oxides is a unique introduction to the equilibrium chemistry of solid inorganic compounds with a focus on metal oxides. Accessible to students with little or no background in defect chemistry, it explains how to apply basic principles and interpret the related behavior of materials. Topics discussed include lattice and electronic defects, doping effects, nonstoichiometry, and mass and charge transport. The text distinctly emphasizes the correlation between the general chemical properties of the constituent elements and the defect chemistry and transport properties of their compounds. It covers the types of defects formed, the effects of dopants, the amount and direction of nonstoichiometry, the depths of acceptor and donor levels, and more. Concluding chapters present up-to-date and detailed analyses of three systems: titanium dioxide, cobalt oxide and nickel oxide, and barium titanate. The Defect Chemistry of Metal Oxides is the only book of its kind that incorporates sample problems for students to solve. Suitable for a variety of courses in materials science and engineering, chemistry, and geochemistry, it also serves as a valuable reference for researchers and instructors.
Download or read book Ceramic Abstracts written by and published by . This book was released on 1998 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Defects in Solids written by Richard J. D. Tilley and published by John Wiley & Sons. This book was released on 2008-10-10 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a thorough understanding of the chemistry and physics of defects, enabling the reader to manipulate them in the engineering of materials. Reinforces theoretical concepts by placing emphasis on real world processes and applications. Includes two kinds of end-of-chapter problems: multiple choice (to test knowledge of terms and principles) and more extensive exercises and calculations (to build skills and understanding). Supplementary material on crystallography and band structure are included in separate appendices.
Download or read book Polar Oxides written by Rainer Waser and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Structure of BaTiO3 written by Edward G. Grimsal and published by . This book was released on 1950 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of Solid Surfaces written by Philip F. Kane and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 675 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until comparatively recently, trace analysis techniques were in general directed toward the determination of impurities in bulk materials. Methods were developed for very high relative sensitivity, and the values determined were average values. Sampling procedures were devised which eliminated the so-called sampling error. However, in the last decade or so, a number of developments have shown that, for many purposes, the distribution of defects within a material can confer important new properties on the material. Perhaps the most striking example of this is given by semiconductors; a whole new industry has emerged in barely twenty years based entirely on the controlled distribu tion of defects within what a few years before would have been regarded as a pure, homogeneous crystal. Other examples exist in biochemistry, metallurgy, polyiners and, of course, catalysis. In addition to this of the importance of distribution, there has also been a recognition growing awareness that physical defects are as important as chemical defects. (We are, of course, using the word defect to imply some dis continuity in the material, and not in any derogatory sense. ) This broadening of the field of interest led the Materials Advisory Board( I} to recommend a new definition for the discipline, "Materials Character ization," to encompass this wider concept of the determination of the structure and composition of materials. In characterizing a material, perhaps the most important special area of interest is the surface.
