Structural instability of unfilled skutterudite compounds MX3 (M=Co, Rh, and Ir; X=As and Sb) under high pressure
Structural instability of unfilled skutterudite compounds MX3 (M=Co, Rh, and Ir; X=As and Sb) under high pressure
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高压下未填充方钴矿化合物 MX3（M=Co、Rh 和 Ir；X=As 和 Sb）的结构不稳定性
DOI：
10.1143/jpsj.81.104604
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Matsui
中科院分区：
文献类型：
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作者：
南部雄亮;羽合孝文;大串研也;Fei Du,横尾哲也;伊藤晋一;上田寛;吉澤英樹;佐藤卓;K. Matsui
利用同步辐射和金刚石砧电池，在高达60 GPa的高压下，研究了二元未填充的方钨矿化合物smx3 （M= Co， Rh和Ir；X= As和Sb）的粉末X射线衍射图样。在临界压力以上的mx3的x射线衍射图显示出几个布拉格峰强度的异常降低。此外，mx3的压力-体积曲线显示出体积随压力减小的饱和特性。压力释放后，mx3的体积大于原始化合物。这种异常行为可以解释为压力诱导的自插入反应。得到了rhsb3的高温高压相图。讨论了mx3在高压下的结构不稳定性。
Powder X-ray diffraction patterns of the binary unfilled skutterudite compoundsMX3(M= Co, Rh, and Ir;X= As and Sb) have been studied under high pressures up to 60 GPa, using synchrotron radiation and a diamond anvil cell. The X-ray diffraction patterns ofMX3above a critical pressure show anomalous reductions in the intensities of several Bragg peaks. Furthermore, the pressure-volume curves ofMX3reveal a saturation behavior of the volume reduction with pressure. Upon pressure release,MX3exhibit a volume greater than those of pristine compounds. This anomalous behavior could be interpreted as a pressure-induced self-insertion reaction. Furthermore, the high-temperature and high-pressure phase diagram of RhSb3was obtained. The structural instability ofMX3under high pressures is discussed.