arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.13232physics.plasm-phcond-mat.mtrl-sci
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热态致密碳的结构

The structure in warm dense carbon

J. Vorberger, K. U. Plageman, R. Redmer

摘要:

研究了石墨、金刚石和BC8固相压力区中流体碳相的结构。我们发现随着密度的增加,配位数增加。从零到$30$ GPa,液体表现出随温度升高而降低的填充效率。然而,对于较高的压力,配位数随着温度的升高而增加。高达$1.5$ eV和独立的压力高达$1000$ GPa,在离子结构因子的双峰结构存在,表明持久的共价键。在从零到$1000$ GPa的整个压力范围内,流体的结构和性质强烈地由这种共价键决定。

英文摘要:

The structure of the fluid carbon phase in the pressure region of the graphite, diamond, and BC8 solid phase is investigated. We find increasing coordination numbers with an increase in density. From zero to $30$ GPa, the liquid shows a decrease of packing efficiency with increasing temperature. However, for higher pressures, the coordination number increases with increasing temperature. Up to $1.5$ eV and independent of the pressure up to $1000$ GPa, a double-peak structure in the ion structure factors exists, indicating persisting covalent bonds. Over the whole pressure range from zero to $1000$ GPa, the fluid structure and properties are strongly determined by such covalent bonds.

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