Structural aspects of dense solid halogens under high pressure studied by x-ray diffraction—Molecular dissociation and metallization
Structural aspects of dense solid halogens under high pressure studied by x-ray diffraction—Molecular dissociation and metallization
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DOI：
10.1016/0022-3697(95)00081-x
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发表时间：
1995-10
影响因子：
4
通讯作者：
H. Fujihisa;Y. Fujii;K. Takemura;O. Shimomura
中科院分区：
文献类型：
--
作者：
H. Fujihisa;Y. Fujii;K. Takemura;O. Shimomura
我们利用先进的同步辐射X射线衍射技术，结合金刚石顶锤高压室，对超高压下固体溴的结构进行了研究。在其高达80 Gpa的分子相中进行的可靠的强度测量，使我们能够确定分子位置的压力依赖关系。结合前人对碘和氯的研究结果，我们发现了这三个等结构体系的晶体结构随其分子内键长变化的经验标度律。通过应用Herzfeld判据，我们还发现了分子解离前金属化过程的标度律。
We have performed structural studies of solid bromine under ultrahigh pressures by using advanced synchrotron radiation X-ray diffraction techniques incorporated with a diamond-anvil high pressure cell. Reliable intensity measurements in its molecular phase up to 80 GPa, where it undergoes the molecular-to-monatomic phase transition (molecular dissociation), have enabled us to determine pressure dependence of molecular positions. By combining the previous results of iodine and chlorine, we have found an empirical scaling rule with respect to the crystal structure scaled with its intramolecular bond length for these three isostructural systems. By applying the Herzfeld criterion, we have also found a scaling rule for the metallization process prior to molecular dissociation.