High pressure phase of MgTe: Stable structure at STP?
High pressure phase of MgTe: Stable structure at STP?
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DOI：
10.1103/physrevlett.74.5232
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发表时间：
1995-06
影响因子：
8.6
通讯作者：
Ting Li;Huan Luo;R. Greene;A. Ruoff;S. Trail;F. Disalvo
中科院分区：
文献类型：
--
作者：
Ting Li;Huan Luo;R. Greene;A. Ruoff;S. Trail;F. Disalvo
使用室温下 6 GPa 的能量色散 X 射线衍射，在金刚石砧池中研究了 MgTe 的晶体结构。对于 MgTe，在 {ital P}{approx}1{minus}3.5 GPa 下观察到了镁硫族化物中第一个压力诱导的结构相变。新相已被标记为 NiAs 结构，并且在卸载至低压 (0. GPa) 并在 100 {°C} 下退火 10 小时后它仍然存在。这是与最近的理论预测相一致的第一个实验证据，即在低温下 MgTe 的基态是 NiAs 结构。这也是第一个压力诱导的纤锌矿向 NiAs 的转变。
The crystal structure of MgTe has been studied in a diamond anvil cell using energy dispersive x-ray diffraction to 6 GPa at room temperature. The first pressure-induced structural phase transformation among magnesium chalcogenides was observed for MgTe at {ital P}{approx}1{minus}3.5 GPa. The new phase has been indexed as the NiAs structure and it persisted after unloading to low pressure (0. GPa) and annealing for 10 h at 100 {degree}C. This is the first experimental evidence consistent with a recent theoretical prediction that for low temperature the ground state of MgTe is the NiAs structure. It is also the first pressure-induced wurtzite to NiAs transition.