Phase transition, elastic, and thermodynamic properties of NaF under high pressure

Phase transition, elastic, and thermodynamic properties of NaF under high pressure
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高压下 NaF 的相变、弹性和热力学性质

DOI:
10.1080/01411594.2011.635521
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发表时间:
2012-05
期刊:
Phase Transitions, DOI:10.1080/01411594.2011.635521
影响因子:
--
通讯作者:
Qiank-Ku Hu
Qiank-Ku Hu
中科院分区:
其他
文献类型:
--
作者:
You-Chao Wang;Guo-Fa Mi;Hai-Yan Wang;Chang-Yun Li;Qiank-Ku Hu

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采用第一原理平面波赝势密度函数理论方法研究了NaF的相变和弹性性质,并通过准谐波德拜模型获得了热力学性质。获得了NaF从岩盐(B1)到氯化铯(B2)相变的压力约为28GPa,这比之前的理论结果与实验数据更加吻合。发现弹性常数C 11 和C 12 随着压力单调增加;然而,C 44 几乎随压力恒定,这与实验结果非常吻合。还研究了相对体积对压力的依赖性以及热容量对温度和压力的依赖性。
The phase transition and elastic properties of NaF are investigated by first-principle plane-wave pseudopotential density function theory method, and the thermodynamic properties are also obtained through the quasi-harmonic Debye model. The pressure of about 28 GPa for the phase transition of NaF from the rocksalt (B1) to the cesium chloride (B2) is obtained, which agrees better with the experimental data than previous theoretical results. The elastic constants C 11 and C 12 are found to monotonically increase with pressure; however, C 44 is almost constant with pressure, which agrees well with the experimental results. The dependences of both the relative volume on the pressure and the heat capacity on the temperature and pressure are also investigated.
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