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Extended X-ray absorption fine structure --- X-ray absorption near edge structure --- Congresses. --- Congresses.

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Absorption spectra --- Extended x-ray absorption fine structure --- X-ray spectroscopy --- 535 --- Emission spectroscopy, X-ray --- Energy dispersive x-ray spectroscopy --- Excitation analysis, Fluorescent --- Fluorescence analysis, X-ray --- Fluorescent excitation analysis --- Fluorescent x-ray spectroscopy --- X-ray emission spectroscopy --- X-ray fluorescence analysis --- Spectrum analysis --- EXAFS (X-ray spectroscopy) --- X-ray absorption fine structure, Extended --- Selective absorption --- Exciton theory --- Molecular spectroscopy --- Optics --- Absorption spectra. --- Extended x-ray absorption fine structure. --- X-ray spectroscopy. --- 535 Optics --- XES (X-ray emission spectroscopy) --- EXAFS (Extended X-ray absorption fine structure) --- Fine structure, Extended X-ray absorption --- X-ray absorption fine structure

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X-ray absorption fine structure spectroscopy (XAFS) is a powerful and versatile technique for studying structures of materials in chemistry, physics, biology and other fields. This textbook is a comprehensive, practical guide to carrying out and interpreting XAFS experiments. Assuming only undergraduate-level physics and mathematics, the textbook is ideally suited for graduate students in physics and chemistry starting XAFS-based research. It contains concise executable example programs in Mathematica 7. Supplementary material available at www.cambridge.org/9780521767750 includes Mathematica code from the book, related Mathematica programs, and worked data analysis examples. The textbook addresses experiment, theory, and data analysis, but is not tied to specific data analysis programs or philosophies. This makes it accessible to a broad audience in the sciences, and a useful guide for researchers entering the subject.

Extended X-ray absorption fine structure. --- X-ray absorption near edge structure. --- X-ray absorption fine structure. --- Fine structure, X-ray absorption --- XAFS (X-ray absorption fine structure) --- Absorption spectra --- X-ray spectroscopy --- Fine structure, Near edge X-ray absorption --- Near edge structure, X-ray absorption --- Near edge X-ray absorption fine structure --- NEXAFS (Near edge X-ray absorption fine structure) --- XANES (X-ray absorption near edge structure) --- X-ray absorption fine structure --- EXAFS (Extended X-ray absorption fine structure) --- Fine structure, Extended X-ray absorption

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This book on pressure-induced phase transitions in AB2X4 chalcogenide compounds deals with one important AmBnXp material. The interest in these materials is caused by their properties. The results are discussed for three main groups of structural families: cubic-spinel structures, defective tetragonal structures, and other structures like layered and wurtzite-type modifications. A systematic analysis of the behavior of cubic (spinel), tetragonal (defect chalcopyrites and stannites) and other crystal modifications of AB2X4 compounds under hydrostatic pressure is performed. The behavior of AIIAl2S4, AIIGa2S4, AIIAl2Se4 and AIIGa2Se4 compounds with defective tetragonal structures, compounds with layered and wurtzite structures under hydrostatic pressure and the pressure dependence of the band gap, lattice parameters, interatomic distances, vibrational modes and pressure-induced phase transitions is discussed. Many of these compounds,  except oxide spinels, undergo a pressure-induced phase transition towards the rocksalt-type structure. The phase transition is preceded by disorder in the cation sublattice. The dependence of the transition pressure to the rocksalt-type structure as a function of the compound ionicity and the size criterion is analyzed.  At high pressures, all ordered-vacancy compounds are found to exhibit a band anticrossing between several conduction bands that leads to a strong decrease of its pressure coefficient and consequently to a strong non-linear pressure dependence of the direct bandgap energy. Theoretical studies of phase transitions in several ordered-vacancy compounds reveal that the existence of ordered vacancies alter the cation-anion bond distances and their compressibilities. The book is written for students, Ph D. students and specialists in materials science, phase transitions and new materials.

Chalcogenides. --- Extended X-ray absorption fine structure. --- Molecular dynamics. --- Phase change memory. --- Chalcogenides --- Physics. --- Electric properties. --- Natural philosophy --- Philosophy, Natural --- Chalkogenides --- Optical materials. --- Microwaves. --- Optical and Electronic Materials. --- Semiconductors. --- Microwaves, RF and Optical Engineering. --- Applied and Technical Physics. --- Physical sciences --- Dynamics --- Inorganic compounds --- Optics --- Materials --- Hertzian waves --- Electric waves --- Electromagnetic waves --- Geomagnetic micropulsations --- Radio waves --- Shortwave radio --- Electronic materials. --- Optical engineering. --- Mechanical engineering --- Crystalline semiconductors --- Semi-conductors --- Semiconducting materials --- Semiconductor devices --- Crystals --- Electrical engineering --- Electronics --- Solid state electronics --- Electronic materials