Download or read book Glass Formation Structure and Electrical Properties of Glasses in the Ag As Se System written by Pradip Dhirajlal Patel and published by . This book was released on 1977 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Structure and Electrical Properties of the Ag2Se Ga2Se3 GeSe2 Glass System written by Maxwell Adam Thomas Marple and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Silver containing homogeneous chalcogenide glasses in the ternary system Ag2Se-Ga2Se3-GeSe2 (AGGS) are synthesized and their atomic structure-property relationships are investigated. Structural studies are carried out using Raman, 77Se, 71Ga, 69Ga, and 109Ag nuclear magnetic resonance (NMR) spectroscopy. The structure of these glasses consists primarily of a network of corner sharing (Ga/Ge)Se4/2 tetrahedra with a small fraction of homopolar Se-Se bonds. Compositional modification of the atomic structure follows the charge compensated network model developed in the literature for aluminosilicate glasses. Ag2Se acts as a network modifier, forming non-bridging Se in glasses with Ag/Ga >1, while Ga2Se3 plays the role of a network intermediate similar to Al2O3 in oxide glasses. The network favors the formation of homopolar Ge-Ge bonding in glasses with Ag/Ga

Download or read book Electrical Properties of Glasses Glass ceramics and Amorphous Solids written by International Commission on Glass. Sub-committee AIX. and published by . This book was released on 1977 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Introduction to Glass Science and Technology written by James E Shelby and published by Royal Society of Chemistry. This book was released on 2020-10-05 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting the fundamental topics in glass science and technology, this concise introduction includes glass formation, crystallization, and phase separation. Glass structure models, with emphasis on the oxygen balance method, are presented in detail. Several chapters discuss the viscosity, density, thermal expansion, and mechanical properties of glasses as well as their optical and magnetic behavior and the diffusion of ions, atoms, and molecules and their effect on electrical conductivity, chemical durability, and other related behavior. In addition to the effects of atomic structure on the properties of glasses, the effects of phase separation, crystallization, and water content, which are neglected in most texts, are discussed extensively. Glass technology is addressed in chapters dealing with the raw materials for producing glasses, batch calculations, and the melting and fining processes. The compositions, properties, and production of commercial glasses are also presented. A chapter is devoted to the use of thermal analysis in the study of glasses, including their crystallization behavior. This expanded, third edition, includes new chapters on doped vitreous silica and the, often overlooked, role of halides on glass formation and properties. In addition, solutions to all of the exercises at the ends of chapters are included for the first time in this edition. This introductory text is ideal for undergraduates in materials science, ceramics, or inorganic chemistry. It will also be useful to the graduate student, engineer, or scientist seeking basic knowledge of the formation, properties, and production of glass in support of their work.

Download or read book The Structural Influence on Fast Ion Conducting Chalcogenide Glasses written by Maxwell Adam Thomas Marple and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid state batteries are a safer alternative to the current liquid battery technology, although for efficient performance the solid electrolyte must have high room temperature ionic conductivity. Glassy solid electrolytes are superior alternatives to their crystalline counterparts owing to their lack of grain boundaries that can act as a source of resistance for ionic current and as potential pathways for Li dendrite growth. Chalcogenide glasses are favorable materials for solid electrolytes as they have higher ionic conductivity compared to oxides, which can be ascribed to the greater polarizability of the chalcogens and are therefore, the most likely materials to satisfy the requirements for solid state battery applications. Chalcogenide glasses are an important class of materials that are sulfides, selenides or tellurides of group IV and/or V elements, namely Ge, As, P and Si with minor concentrations of other elements such as Ga, Sb, In. These glasses have found a variety of technological applications in the fields of optoelectronics, remote sensing, memory and energy storage. The unique compositional flexibility of chalcogenide glasses in the form of continuous alloying enables tuning of their optical, electronic, thermo-mechanical and other properties. The structure of these glasses are characterized by their covalently bonded networks that largely obey the 8–N coordination rule, violation of chemical order, and structural peculiarities such as the formation of homopolar bonds, molecular and other low-dimensional structural units. All of these are expected to control a wide range of physical properties relevant to various technological applications hence complete knowledge of the atomic structure of these materials is therefore of key importance in understanding and formulating accurate predictive models. The first chapter of this dissertation details the application of high-resolution two-dimensional nuclear magnetic resonance (2D NMR) and Raman spectroscopy to investigate the structure of Si[subscript x]Se[subscript 1-x] glasses as this glass-forming system forms the basis for the classic glassy Li-ion conducting chalcogenides via modification of the network by incorporation of Li2S. The results indicate that the structure of these glasses consists of a network with nearly perfect short-range chemical order, but with strong intermediate-range clustering. Initial addition of Si to Se results in cross-linking of Se chain segments with nanoclusters of corner- and edge-shared SiSe[subscript 4/2] tetrahedra. These clusters percolate via coalescence near x ≥0.2 to finally form a low-dimensional network with high molar volume, at the stoichiometric composition (x=0.33) that is composed of chains of edge-sharing tetrahedra cross-linked by corner-shared tetrahedra. This structural evolution can explain the compositional variation of the glass transition temperature and the molar volume of these glasses. The structure-property relationship for ionic conductivity in chalcogenide glasses is explored next, in a Ag-ion conducting system that has technological application in conductive bridge random access memory. Novel homogeneous glasses in the ternary system Ag2Se-Ga2Se3-GeSe2 (AGGS) are synthesized and studied using Raman, 77Se, [superscript 71/69]Ga, and 109Ag NMR spectroscopy. The structure of these glasses consists primarily of a network of corner sharing (Ga/Ge)Se[subcript 4/2] tetrahedra with a small fraction of homopolar Se-Se bonds. Compositional modification of the atomic structure follows the charge compensated network model with Ag2Se acting as a network modifier, forming non-bridging Se in glasses with Ag/Ga >1, while Ga2Se3 plays the role of an intermediate glass former. Electrical Impedance Spectroscopy (EIS) reveals the ionic conductivity of the AGGS glasses to be quite high at ambient temperature, reaching up to 10−4 S/cm for glasses with the highest Ag content. Transference number measurements using the electromotive force (EMF) method as well as variable temperature 109Ag NMR line shape studies indicate that the conductivity is predominantly ionic in nature. The high ionic conductivity can be related to a heavily modified structural network that results in a potential energy landscape with many suitable hopping sites for the Ag ions. The structural characteristics and electrical properties of the AGGS glasses are used to guide the development of an analogous Li containing system. Two glass systems are investigated, the first is the stoichiometric Li2S-Ga2Se3-GeSe2 system where the Li2S content is varied to study the influence of Li concentration on ionic conductivity. The structure is characterized using Raman and one– and two– dimensional [superscript 6/7]Li, 77Se, and 71Ga NMR spectroscopy and can be described as a charge-compensated network consisting of corner sharing (Ga/Ge)(Se,S)[subscript 4/2] tetrahedra with Li acting as a network modifier, charge compensating the non-bridging Se and S. These non-bridging units are found to have the greatest influence towards maximizing ionic conductivity as they depolymerize the network and alter the Li-ion dynamics. The dc conductivity data indicate a rapid rise in Li-ion mobility with increasing temperature and, more interestingly, with Li concentration. The compositional variation of E[subscript dc] indicates the formation of a low-energy barrier (~0.35 eV) percolation pathway for Li-ion hopping through the glass network. The highest room temperature ionic conductivity of ~ 10−4 S/cm is found in the glass with the highest Li2S content, suggesting that the concentration of the Li ions, rather than their mobility, is the limiting factor for achieving high ionic conductivity in this system. Besides Li concentration, the nature of the chalcogen atoms in the network is found to have an important influence on Li mobility. This phenomenon is investigated in 40%Li2S-60%Ge(S,Se)2 glasses, as a function of the S/(S+Se) ratio. The network structure of these glasses consists of corner-sharing GeS[subscript x/2]Se[subscript (4-x)/2] tetrahedra, with S and Se being randomly distributed over all bridging and non-bridging environments. While these glasses are found to have comparable ionic conductivity that varies little with composition, the activation energy and the pre-exponential factor display a nonlinear variation with the S/(S+Se) ratio and are shown to be related to the progressive phonon softening, as Se replaces S in the mixed-chalcogen network. When taken together, these results suggest that the phonon softening of the structural network of solid electrolytes, induced via compositional modification, can be used to tune their electrical properties.

Download or read book Structural Chemistry of Glasses written by K.J. Rao and published by Elsevier. This book was released on 2002-06-26 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural Chemistry of Glasses provides detailed coverage of the subject for students and professionals involved in the physical chemistry aspects of glass research. Starting with the historical background and importance of glasses, it follows on with methods of preparation, structural and bonding theories, and criteria for glass formation including new approaches such as the constraint model. Glass transition is considered, as well as the wide range of theoretical approaches that are used to understand this phenomenon. The author provides a detailed discussion of Boson peaks, FSDP, Polymorphism, fragility, structural techniques, and theoretical modelling methods such as Monte Carlo and Molecular Dynamics simulation. The book covers ion and electron transport in glasses, mixed-alkali effect, fast ion conduction, power law and scaling behaviour, electron localization, charged defects, photo-structural effects, elastic properties, pressure-induced transitions, switching behaviour, colour, and optical properties of glasses. Special features of a variety of oxide, chalcogenide, halide, oxy-nitride and metallic gasses are discussed. With over 140 sections, this book captures most of the important and topical aspects of glass science, and will be useful for both newcomers to the subject and the experienced practitioner.

Download or read book Introduction to Glass Science and Technology written by J. E. Shelby and published by Royal Society of Chemistry. This book was released on 2005 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Introduction to Glass Science and Technology presents the fundamental topics in glass science and technology including glass formation, crystallisation and phase separation. A detailed discussion of glass structure models with emphasis on the oxygen balance model is also presented. Additional chapters discuss the most important properties of glasses, including physical, optical, electrical, chemical and mechanical properties, and new to this edition, water in glasses and melts. Glass technology is addressed in chapters dealing with the details of glass raw materials, melting and fining, and commercial glass production methods. This expanded second edition also includes new chapters on the compositions and properties of commercial glasses and thermal analysis of glasses and melts. Exercises are included at the end of the chapters. This introductory text is ideal for undergraduates in materials science, ceramics or inorganic chemistry. It will also be useful to the engineer or scientist seeking basic knowledge of the formation, properties and production of glass.

Download or read book Physics and Chemistry of Glasses written by and published by . This book was released on 2005 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Glassy Disordered Systems written by Michael I. Klinger and published by World Scientific. This book was released on 2013 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book describes the fundamental features of glassy disordered systems at high temperatures (close to the liquid-to-glass transition) and for the first time in a book, the universal anomalous properties of glasses at low energies (i.e. temperatures/frequencies lower than the Debye values) are depicted. Several important theoretical models for both the glass formation and the universal anomalous properties of glasses are described and analyzed. The origin and main features of soft atomic-motion modes and their excitations, as well as their role in the anomalous properties, are considered in detail. It is shown particularly that the soft-mode model gives rise to a consistent description of the anomalous properties. Additional manifestations of the soft modes in glassy phenomena are described. Other models of the anomalous glassy properties can be considered as limit cases of the soft-mode model for either very low or moderately low temperatures/frequencies.

Download or read book Electrical Properties of Glass and Glass ceramics written by International Commission on Glass. Sub-committee A IX. and published by . This book was released on 1969 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Glasses and the Vitreous State written by Jerzy Zarzycki and published by Cambridge University Press. This book was released on 1991-07-25 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an up-to-date and comprehensive coverage of the properties of glasses as materials and of the vitreous state in general. The broad coverage of the book includes a study of the methods of studying the structure, glass classification, and electrical, optical, thermal and mechanical properties of glasses.

Download or read book The Structure of Glass written by and published by . This book was released on 1958 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Materials Processing Fundamentals 2021 written by Jonghyun Lee and published by Springer Nature. This book was released on 2021-03-21 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers various aspects of the fundamentals, synthesis, analysis, design, monitoring, and control of metals, materials, and metallurgical processes and phenomena. Topics represented include but are not limited to: • Experimental, analytical, physical, and computer modeling of physical chemistry and thermodynamics • Modeling of the transport phenomena in materials processing and metallurgical processes involving iron, steel, nonferrous metals, and composites • Second-phase particles in metals and processes and the fundamentals (experimental studies or theoretical studies) on the nucleation, growth, motion, and removal of these particles from the molten metal or reactors • Physical chemistry, thermodynamics, and kinetics for the production and refining of rare-earth metals • Control of industrial processes in the field of extraction and processing of metals and materials

Download or read book Composite Materials written by Kamal K. Kar and published by Springer. This book was released on 2016-10-14 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are used as substitutions of metals/traditional materials in aerospace, automotive, civil, mechanical and other industries. The present book collects the current knowledge and recent developments in the characterization and application of composite materials. To this purpose the volume describes the outstanding properties of this class of advanced material which recommend it for various industrial applications.

Download or read book Electrical Properties and the Structure of Glasses in Tthe Li2SO4 LiPO3 System written by I. A Sokolov and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976-05 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: