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首页> 外文期刊>Physica status solidi, B. Basic research >Structures at high pressure from random searching
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Structures at high pressure from random searching

机译:来自随机搜索的高压结构

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摘要

An approach to searching for the structures of crystals is de-scribed. We choose an ensemble of "random" starting struc-tures and relax them, often constraining the starting structuresand/or relaxation to bias the search in some manner. Themethodology is illustrated by applications to high-pressurephases of group IV hydrides, especially silane (SiH4), and tosolid hydrogen, using first-principles density-functional theory methods. We discuss the issue of possible decomposi-tion of group IV hydrides into their constituent elements un-der pressure. A new molecular-hydrogen structure is de-scribed whose enthalpy is calculated to be slightly lower thanall other known structures in the pressure range 75-108 GPa,and we mention its possible relevance to phase IT of hydro-gen.
机译:描述了一种寻找晶体结构的方法。我们选择“随机”起始结构的集合并放宽它们,通常会限制起始结构和/或放宽以某种方式使搜索偏向。通过使用第一性原理密度泛函理论方法将方法应用于IV组氢化物(尤其是硅烷(SiH4))的高压相以及对固体氢的应用来说明该方法。我们讨论在压力下IV族氢化物可能分解成其组成元素的问题。描述了一种新的分子氢结构,其焓值经计算比压力范围为75-108 GPa的所有其他已知结构略低,我们提到了它与氢的IT相的可能相关性。

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