Structural Stability and Shock Decomposition of UH<sub>3</sub> at High Temperature and High Pressure

WANG Yufeng; HAO Long; WU Fengchao; GENG Huayun; LI Jun

doi:10.11858/gywlxb.20240709

Volume 38 Issue 3

Jun 2024

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Chinese Journal of High Pressure Physics > 2024 > 38(3): 030108.

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WANG Yufeng, HAO Long, WU Fengchao, GENG Huayun, LI Jun. Structural Stability and Shock Decomposition of UH₃ at High Temperature and High Pressure[J]. Chinese Journal of High Pressure Physics, 2024, 38(3): 030108. doi: 10.11858/gywlxb.20240709

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Structural Stability and Shock Decomposition of UH₃ at High Temperature and High Pressure

doi: 10.11858/gywlxb.20240709

National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 13 Jan 2024
Rev Recd Date: 19 Mar 2024

Available Online: 07 May 2024

Issue Publish Date: 03 Jun 2024

Abstract

Abstract

Using statistical physical model, the equation of state of UH₃ crystal and its chemical decomposition products were constructed in this paper. The phase diagram of UH₃ at high temperature and high pressure was obtained by Gibbs free energy comparison, and the shock compression properties of UH₃ with different initial densities were investigated. The results show that the chemical decomposition of UH₃ crystals occurs at about 74.0 GPa under isothermal compression. Increasing the temperature promotes the chemical decomposition, but the influence of pressure on the chemical decomposition of UH₃ is non-monotonic. Solid UH₃ decomposes at 35–50 GPa under shock compression, and the chemical decomposition process is accompanied by obvious volume collapse, therefore, the Hugoniot of UH₃ decomposition products lies below the isotherm, which is an abnormal phenomenon in comparison with ordinary metals or compounds. Moreover, the decomposition pressure of UH₃ decreases with the increase of initial porosity. When the initial porosity is about 1.5, the decomposition products of UH₃ are more difficult to compress than UH₃ in crystal phase, thus showing a phenomenon similar to the abnormal expansion of large porosity materials under shock compression. These results enrich our understanding of dynamical compression behavior of UH₃, and can serve as theoretical basis for further research on physical and chemical properties of actinide metal hydrides at high temperature and high pressure.
- UH₃,
- hydride,
- equation of state,
- high temperature and high pressure,
- structural stability,
- chemical decomposition

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References

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Structural Stability and Shock Decomposition of UH₃ at High Temperature and High Pressure

doi: 10.11858/gywlxb.20240709

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Structural Stability and Shock Decomposition of UH₃ at High Temperature and High Pressure