Equation of State of Tantalum up to 133 GPa
Equation of State of Tantalum up to 133 GPa
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DOI：
10.1088/0256-307x/27/1/016402
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发表时间：
2010
影响因子：
3.5
通讯作者：
Tang Ling-Yun;L. Lei;Liu Jing;Xiao Wan-sheng;Liang Yan-chun;Li Xiao-dong;B. Yan
中科院分区：
文献类型：
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作者：
Tang Ling-Yun;L. Lei;Liu Jing;Xiao Wan-sheng;Liang Yan-chun;Li Xiao-dong;B. Yan
在高达133 Gpa的金刚石顶压室(DAC)中，用原位能量色散同步辐射粉末X射线衍射法测定了Ta的静态状态方程。Ta的体心立方(BCC)相在所研究的整个压力范围内是稳定的。通过将测得的压力-体积数据拟合到维尼式状态方程来约束Ta的体积弹性系数及其一阶压力导数：B0=192.65？(3.0 8)Gpa，B‘0=3.5 8？(0.11)。为了避免非静力应力的影响，采用了Ar作为压力介质。同时对试件的应力状态进行了仔细的检查。
The static equation of state (EOS) of tantalum (Ta) is determined by in situ energy-dispersive synchrotron powder x-ray diffraction in a diamond anvil cell (DAC) up to 133 GPa. The body-centered-cubic (bcc) phase of Ta is found to be stable over the entire pressure range investigated. The bulk moduli and its first pressure derivative of Ta are constrained by fitting the determined pressure-volume data to Vinet form EOS: B0 = 192.65 ? (3.08) GPa and B'0 = 3.58 ? (0.11). For the sake of avoiding the affect of non-hydrostatic stress, argon is used as a pressure media. A careful checking of the stress state of the sample is presented simultaneously.