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Abstract
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.
Highlights
For the concern of its applications, the high pressure stability of Thorium monocarbide (ThC) has stimulated many interests of theorists and experimentalists
A typical two-dimensional (2D) diffraction pattern is shown in Fig. 1a at the first pressure point 1.2 GPa in the diamond anvil cell
A weak peak near (111)ThC was identified as (002) from ThC2, a by-product owing to the excess carbon consumed during the synthesis process[6]
Summary
For the concern of its applications, the high pressure stability of ThC has stimulated many interests of theorists and experimentalists. A typical two-dimensional (2D) diffraction pattern is shown in Fig. 1a at the first pressure point 1.2 GPa in the diamond anvil cell.
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