硫黄
相(物质)
催化作用
化学
三角晶系
相变
高压
结晶学
热力学
材料科学
晶体结构
有机化学
物理
作者
Shanmin Wang,Jianzhong Zhang,Duanwei He,Yi Zhang,Liping Wang,Hongwu Xu,Xiaodong Wen,Hui Ge,Yusheng Zhao
标识
DOI:10.1016/j.jpcs.2013.09.001
摘要
We report phase transition and stability of MoS2 with and without the presence of sulfur melt under high-pressure and high-temperature conditions. Rhombohedral (3R) phase is found to be a high-temperature phase of MoS2 at high pressures. Excess sulfur melt catalyzes the hexagonal (2H) to rhombohedral (3R) phase transformation and lowers the conversion temperature by more than 280 K. Boundary between 2H and 3R phases has been delineated with a negative slope. Based on experimental observations, sulfur-catalyzed 2H→3R transformation mechanisms are proposed involving atomic exchange between MoS2 and sulfur, which is different from the case of without excess sulfur that proceeds through rotation and translation of the S–Mo–S sandwich layers.
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