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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.
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.
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