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arXiv 0908.1625cond-mat.mtrl-sci
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$α$ -S和Rh-S硫族化合物结构和电子结构的第一性原理表征

A first-principles characterization of the structure and electronic structure of $α$-S and Rh-S chalcogenides

Oswaldo Diéguez, Nicola Marzari

摘要:

我们使用第一性原理计算研究了三种已知形式的Rh-S硫族化合物的结构、电子和热力学性质:Rh $_2$ S $_3$、Rh $_3$ S $_4$和Rh $_{17}$ S $_{15}$。在这种方法中,以前只研究了这些感兴趣的催化材料中的第一种。我们发现,Rh $_{17}$ S $_{15}$结晶在{ \em Pm}\={3}{ \em m}中心对称结构,实验上相信,但从未证实。我们显示这些化合物的能带结构和态密度。最后,我们还研究了固体硫($α$ -S)的基态结构,由于其要求的128个原子的晶胞和S $_8$单元之间的色散相互作用,这是对完全第一性原理计算提出挑战的少数元素之一。

英文摘要:

We have used first-principles calculations to study the structural, electronic, and thermodynamic properties of the three known forms of Rh-S chalcogenides: Rh$_2$S$_3$, Rh$_3$S$_4$, and Rh$_{17}$S$_{15}$. Only the first of these materials of interest for catalysis had been studied previously within this approach. We find that Rh$_{17}$S$_{15}$ crystallizes in a {\em Pm}\={3}{\em m} centrosymmetric structure, as believed experimentally but never confirmed. We show band structures and densities of states for these compounds. Finally, we also investigated the ground state structure of solid sulfur ($α$-S), one of the few elements that represents a challenge for full first-principles calculations due to its demanding 128-atom unit cell and dispersion interactionis between S$_8$ units.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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