Equation of state of bcc-Mo by static volume compression to 410 GPa
Equation of state of bcc-Mo by static volume compression to 410 GPa
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DOI：
10.1063/1.4903940
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发表时间：
2014-12-14
影响因子：
3.2
通讯作者：
Singh, Anil K.
中科院分区：
文献类型：
--
作者：
Akahama, Yuichi;Hirao, Naohisa;Singh, Anil K.
利用金刚石顶石池和同步辐射源，用x射线粉末衍射同时测量了Mo和Pt的单元胞体积，其体积接近400GPa。Mo的体心立方相（bcc）在410 GPa下是稳定的。在Pt压力标度的基础上确定了bcc-Mo的状态方程（EOS）。Vinet EOS与体积压缩数据的拟合得到K-0 = 262.3(4.6) GPa, K-0′= 4.55(16)，一大气压原子体积V-0 = 31.155(24) A(3)。虽然激波压缩实验中Mo的EOS比现有的EOS低7.2% ~ 11.3%，但在兆巴范围内，EOS与前人的超声数据在2.5% ~ 3.3%的压差范围内吻合良好。该协议表明，Pt压力计在超高压范围内提供准确的压力值。(C) 2014 AIP出版有限责任公司
Unit cell volumes of Mo and Pt have been measured simultaneously to approximate to 400GPa by x-ray powder diffraction using a diamond anvil cell and synchrotron radiation source. The body-centered cubic (bcc) phase of Mo was found to be stable up to 410 GPa. The equation of state (EOS) of bcc-Mo was determined on the basis of Pt pressure scale. A fit of Vinet EOS to the volume compression data gave K-0 = 262.3(4.6) GPa, K-0' = 4.55(16) with one atmosphere atomic volume V-0 = 31.155(24) A(3). The EOS was in good agreement with the previous ultrasonic data within pressure difference of 2.5%-3.3% in the multimegabar range, though the EOS of Mo proposed from a shock compression experiment gave lower pressure by 7.2%-11.3% than the present EOS. The agreement would suggest that the Pt pressure scale provides an accurate pressure value in an ultra-high pressure range. (C) 2014 AIP Publishing LLC.