Yu Cun, Lin Jun, Huai Ping, Guo Yongliang, Ke Xuezhi, Yu Xiaohe, Yang Ke, Li Nana, Yang Wenge, Sun Baoxing, Xie Ruobing, Xu Hongjie
Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS), Shanghai, 201800, China.
Department of Physics, East China Normal University, Shanghai, 200241, China.
Sci Rep. 2017 Mar 7;7(1):96. doi: 10.1038/s41598-017-00226-4.
Thorium monocarbide (ThC) as a potential fuel for next generation nuclear reactor has been subjected to its structural stability investigation under high pressure, and so far no one reported the observation of structure phase transition induced by pressure. Here, utilizing the synchrotron X-ray diffraction technique, we for the first time, experimentally revealed the phase transition of ThC from B1 to P4/nmm at pressure of ~58 GPa at ambient temperature. A volume collapse of 10.2% was estimated during the phase transition. A modulus of 147 GPa for ThC at ambient pressure was obtained and the stoichiometry was attributed to the discrepancy of this value to the previous reports.
碳化钍（ThC）作为下一代核反应堆的潜在燃料，已在高压下对其结构稳定性进行了研究，到目前为止，尚未有人报道观察到压力诱导的结构相变。在此，利用同步辐射X射线衍射技术，我们首次在室温下约58 GPa的压力下通过实验揭示了ThC从B1相到P4/nmm相的相变。估计在相变过程中体积收缩了10.2%。获得了室温下ThC的模量为147 GPa，并且化学计量比归因于该值与先前报道的差异。
