Department of Electronic Engineering, National Changhua University of Education, Changhua 500, Taiwan.
J Chem Phys. 2012 Jul 14;137(2):024509. doi: 10.1063/1.4733985.
The high pressure induced phase transition in rhenium diselenides (ReSe(2)) and gold-doped rhenium diselenides (Au-ReSe(2)) at ambient temperature have been investigated using angular-dispersive x-ray diffraction (ADXRD) under high pressure up to around 10.50 and 9.98 GPa, respectively. In situ ADXRD measurements found that the phase transition pressures of ReSe(2) and Au-ReSe(2) began at 9.98 and 8.52 GPa, respectively. Compressibilities analysis shows the relationship of along c-axis > along a-axis > along b-axis. The linear compressibility of the pressure dependence of α, β, and γ of ReSe(2) shows that a phase transition can be related to a counterclockwise rotational trend of the selenium atoms around the chain of Re(4) atoms during the decrease of the c-axis distance by a combination of stresses due to the bending effect of α and stretching effect of β. The cause of the reduction of the phase transition pressure of Au-ReSe(2) is attributed mainly to a structural distortion as evidenced by the observation of a weak clockwise rotational trend of Se atoms around the chain of Re(4) atoms in the pressure range 3.99-4.99 GPa which subsequently reversed to counterclockwise rotation under higher pressure.
在环境温度下，使用角分辨 X 射线衍射（ADXRD）对铼二硒化物（ReSe2）和金掺杂铼二硒化物（Au-ReSe2）中的高压诱导相变进行了研究，压力最高可达约 10.50 和 9.98 GPa。原位 ADXRD 测量发现，ReSe2 和 Au-ReSe2 的相变压力分别在 9.98 和 8.52 GPa 开始。压缩性分析表明，沿 c 轴的关系>沿 a 轴的关系>沿 b 轴的关系。ReSe2 的压力依赖性α、β和γ的线性压缩性表明，硒原子在 c 轴距离减小的过程中围绕 Re(4)原子链的逆时针旋转趋势可以与由弯曲效应引起的应力和β的拉伸效应相结合有关。Au-ReSe2 的相变压力降低的原因主要归因于结构变形，这可以从观察到的在 3.99-4.99 GPa 压力范围内硒原子围绕 Re(4)原子链的弱顺时针旋转趋势中得到证实，随后在更高压力下反向旋转至逆时针旋转。
