Bulk moduli and high pressure crystal structure of U3Si2

JOURNAL OF NUCLEAR MATERIALS

卷:523

Article

Guo, Xiaofeng^1,2,3  Lu, Xujie⁴  White, Joshua T.⁵  Benmore, Chris J.⁶  Nelson, Andrew T.^5,7  Roback, Robert C.³  Xu, Hongwu³ 

[1] Washington State Univ, Dept Chem, Pullman, WA 99164 USA

[2] Washington State Univ, Alexandra Navrotsky Inst Expt Thermodynam, Pullman, WA 99164 USA

[3] Los Alamos Natl Lab, Earth & Environm Sci Div, Los Alamos, NM 87545 USA

[4] Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China

[5] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA

[6] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[7] Oak Ridge Natl Lab, Fus & Mat Nucl Syst Div, Oak Ridge, TN 37830 USA

关键词: Uranium silicide;    Bulk modulus;    High pressure;    Synchrotron X-ray diffraction;    Diamond anvil cell;   

DOI  :  10.1016/j.jnucmat.2019.06.006

来源: Elsevier

【 摘 要 】

Bulk moduli are important parameters to assess the mechanical performance of materials including nuclear fuels. However, little experimental data exist for U3Si2, a potential accident-tolerant nuclear fuel, whose bulk modulus has only been measured by resonant ultrasonic spectroscopy (RUS). In addition, the knowledge for high-pressure structural behavior and phase equilibrium of U3Si2 is largely lacking. Here we studied pressure dependence of the crystal structure of U3Si2 using high-energy synchrotron X-ray diffraction coupled with Rietveld analysis. The pressurization was achieved using a diamond anvil cell (DAC) which provides quasi-hydrostatic pressures up to 37.6 GPa. Crystal structural variation and equations of state of U3Si2 were obtained, and its bulk modulus, a- and c-axial moduli were derived to be 107.11 +/- 5.65 GPa, 82.87 +/- 4.78 GPa and 194.52 +/- 12.03 GPa, respectively. The determined elastic parameters are compared with those obtained by RUS and nanoindentation. (C) 2019 Elsevier B.V. All rights reserved.

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