Abstract
The alkali-halide compounds and 16 crystals of chalcogenides of alkaline-earth metals (oxides, sulfides, selenides, tellurides) form a large group of ionic crystals which under normal conditions have a structure of the NaCl type. Analysis of the existing experimental data on the compression of ionic crystals shows that most of them undergo under pressure a first-order phase transition from a structure of the NaCl type (the B1 phase) to a structure of the CsCl type (B2 phase). Many theoretical works on the equations of state and phase transitions of ionic compounds are devoted to alkali-halide crystals. Similar theoretical calculations for chalcogenides have been performed only for oxides [1–3]. It is undoubtedly of interest to further study theoretically the equations of state of the static and dynamic compression of chalcogenides of alkalineearth metals. This would enable establishing the general laws governing the behavior of chaocogenides and analyzing the specific features of their interparticle interactions at high pressure. In this paper the pressures of phase transitions of the type B1–B2, the equations of state of hydrostatic compression, and the shock adiabats of the barium chalcogenides BaS, BaSe, and BaTe in the B1 and B2 phases are calculated based on the binding energy function proposed in [1].
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Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 3, pp. 114–117, May–June, 1986.
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Vaal', A.A., Chernov, D.E. Equation of state of static and dynamic compression of barium chalcogenides. J Appl Mech Tech Phys 27, 427–430 (1986). https://doi.org/10.1007/BF00910526
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DOI: https://doi.org/10.1007/BF00910526