New phase transition of solid bromine under high pressure.
New phase transition of solid bromine under high pressure.
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DOI：
10.1103/physrevlett.99.015501
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发表时间：
2007-07
影响因子：
8.6
通讯作者：
A. San-Miguel;H. Libotte;M. Gauthier;G. Aquilanti;S. Pascarelli;J. Gaspard
中科院分区：
文献类型：
--
作者：
A. San-Miguel;H. Libotte;M. Gauthier;G. Aquilanti;S. Pascarelli;J. Gaspard
通过 X 射线吸收光谱实验对固体溴进行了研究，最大压力可达 75 GPa。扩展精细结构的数据分析表明，分子内距离首先增加，在25+/-5 GPa时达到最大值。从该值开始，分子内距离突然开始减小，证明在 25+/-5 GPa 下发生了之前未观察到的相变。在 65+/-5 GPa 下观察到最大变化为 0.08 A，此时再次发生相变。最后的转变可能与最近观察到的不相称调制相位的变化相对应。我们讨论了在 25+/-5 GPa 下观察到的新相变对其他卤素的情况的可能推广。
Solid bromine has been studied by x-ray absorption spectroscopy experiments up to a maximum pressure of 75 GPa. The data analysis of the extended fine structure reveals that the intramolecular distance first increases, reaching its maximum value at 25+/-5 GPa. From this value the intramolecular distance abruptly begins to decrease evidencing a nonpreviously observed phase transformation taking place at 25+/-5 GPa. A maximum variation of 0.08 A is observed at 65+/-5 GPa where again a phase transition occurs. This last transformation could correspond with the recently observed change to an incommensurate modulated phase. We discuss the possible generalization of the observed new phase transition at 25+/-5 GPa to the case of the other halogens.