کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1614642 1516339 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ab-initio study of phase stability, thermodynamic and elastic properties of beryllium sulfide under extreme condition
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Ab-initio study of phase stability, thermodynamic and elastic properties of beryllium sulfide under extreme condition
چکیده انگلیسی

Pressure-induced phase transition, thermodynamic and elastic properties of BeS are investigated by ab-initio method and quasi-harmonic Debye model. The phase transition of BeS from ZB to RS occurs at 51.45 GPa accompanied by 11.23% volume collapse. Phase transition is due to S atom’s weakened electron attraction. Once the shared charge center of shared electron reaches 0.58, will the phase be unstable. Cv is much larger at high temperature, and reduces with pressure. At intermediate temperature, Cv reduces with P rapidly, but the decreasing is unobvious under too low or too high temperature. At sufficiently low temperature, Cv is proportional to T3; at intermediate temperature, Cv rises sharply; at high temperature, Cv reaches to Dulong–Pettit limit. The maximum expansion coefficient is less than 1.5 × 10−5 K−1. Pressure will suppress expansion caused by high temperature evidently. Elastic constants of BeS rise with pressure. Shear moduli (c and c′) of ZB keeps steady relatively; the c′ of RS increases with pressure clearly.


► The phase transition of BeS from ZB to RS occurs at 51.45 GPa accompanied by 11.23% volume collapse.
► Phase transition is due to S atom’s weakened electron attraction.
► Physical properties of BeS are greatly affected by the changes of direction of S–Be covalent bond.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 554, 25 March 2013, Pages 363–370
نویسندگان
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