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- W2085754921 abstract "The temperature dependences of the unit cell parameter a(T) of tin telluride with different extents of deviation from stoichiometry are obtained during heating from 80 to 290 K. The a(T) dependence for a sample with the stoichiometric composition (50 at.%Te) displays an anomaly in the temperature range 90–100 K, which is attributed to the well-known ferroelectric phase transition (PT). Well-pronounced jumps in the unit cell parameter (Δa/a≈0.015) observed for 50.4 at.%Te in the intervals 135– 150 K and 200-215 K correspond to a negative thermal expansion coefficient. Upon a further increase in the deviation from stoichiometry (50.8 at.%Te) these effects become less pronounced. The instability in the crystal lattice in certain temperature intervals is attributed to phase transitions in the subsystem of intrinsic defects (nonstoichiometric vacancies) associated with their redistribution over the cation sublattice upon a change in the temperature and composition. The role of relaxation phenomena in the rearrangement of crystal defect subsystem is determined." @default.
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- W2085754921 date "1999-04-01" @default.
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- W2085754921 title "Low-temperature lattice instability in SnTe" @default.
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- W2085754921 doi "https://doi.org/10.1063/1.593732" @default.
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