C60 under pressure-bulk modulus and equation of state
C60 under pressure-bulk modulus and equation of state
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C60 压力-体积模量和状态方程
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
G. Burkhart
中科院分区：
文献类型：
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作者：
H. A. Ludwig;W. Fietz;F. Hornung;K. Grube;B. Wagner;G. Burkhart
利用角色散X射线散射和金刚石对顶砧装置研究了C_（60）在高达13 GPa压力下的晶体结构。实验装置的分辨率允许检查体积减少dV/dp的压力下，即使是十分之一GPa的压力。大量实验运行获得的数据导致体积模量为13.4 GPa，远小于Duclos等人[1]报告的值。在170 K和70 K的体积模量分别为14.2 GPa和14.7 GPa。在300 K下的压力诱导的fcc-sc转变在约100 K下清晰可见。0.3 GPa，晶格参数跳跃为0.05 μ m。随着压力的增加，我们发现dV/dp发生了极端变化，这使得常见的状态方程（EOS）无法使用，如Murnaghan [2]或Birch [3]方程。考虑到富勒烯分子的可压缩性很小，我们提出了一个修正的状态方程来描述实验数据。
C60 has been investigated under pressure up to 13 GPa using angular dispersive X-ray scattering and a diamond anvil cell. The resolution of the experimental setup allows to examine the volume decrease dV/dp under pressure even for pressures of a tenth of a GPa. The obtained data of numerous experimental runs result in a bulk modulus of 13.4 GPa, which is much smaller than the value reported by Duclos et al. [1]. At 170 K and 70 K a bulk modulus of 14.2 GPa and 14.7 GPa was obtained, respectively. The pressure induced fcc-sc transition at 300 K was clearly visible at approx. 0.3 GPa with a jump in the lattice parameter of 0.05 Å. With increasing pressure we found an extreme change in dV/dp, which disables the usage of common equations of state (EOS), like the Murnaghan [2] or Birch [3] equation. Considering the small compressibility of the fullerence molecules we suggest a modified EOS to describe the experimental data.