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Thermodynamics of hydrogen vacancies in MgH_2 from first-principles calculations and grand-canonical statistical mechanics

机译:基于第一性原理计算和大经典统计力学的MgH_2中氢空位的热力学

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摘要

Ab initio calculations and statistical mechanics are combined to elucidate the thermodynamics of H vacancies in MgH_2. A general method based on a grand-canonical ensemble of defect configurations is presented to model the exchange of hydrogen between crystalline MgH_2 and gas-phase H_2. We find that, even at the lowest hydrogen partial pressures at which the hydride phase is stable, MgH_2 is capable of accommodating only very small concentrations of hydrogen vacancies. These vacancies are mainly isolated rather than forming clusters, contrary to what is expected from a simple energetic analysis.
机译:从头算和统计力学相结合,阐明了MgH_2中H空位的热力学。提出了一种基于缺陷构型的大正则集合的通用方法,以模拟晶体MgH_2和气相H_2之间的氢交换。我们发现,即使在氢化物相稳定的最低氢分压下,MgH_2也只能容纳极少量的氢空位。这些空缺主要是孤立的而不是形成簇,这与简单的能量分析所期望的相反。

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