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Sulfur-catalyzed phase transition in MoS2 under high pressure and temperature |
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| Authors: | Shanmin Wang Jianzhong Zhang Duanwei He Yi Zhang Liping Wang Hongwu Xu Xiaodong Wen Hui Ge Yusheng Zhao |
| Affiliation: | 1. HiPSEC & Department of Physics, University of Nevada Las Vegas, Las Vegas, NV 89154, USA;2. Institute of Atomic & Molecular Physics, Sichuan University, Chengdu 610065, PR China;3. LANSCE, EES, & Theoretical Divisions, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;4. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, PR China |
| Abstract: | 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. |
| Keywords: | C. High pressure D. Phase transition |
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