Ultrahigh-pressure scales for gold and platinum at pressures up to 550 GPa
Ultrahigh-pressure scales for gold and platinum at pressures up to 550 GPa
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DOI：
10.1103/physrevb.80.104114
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发表时间：
2009-09-01
影响因子：
3.7
通讯作者：
Tsuchiya, Taku
中科院分区：
文献类型：
--
作者：
Yokoo, Manabu;Kawai, Nobuaki;Tsuchiya, Taku
利用重新测量的580 GPa压力下的冲击压缩数据修正了金（Au）的状态方程，并考虑了电子自由能的贡献.该模型，即使只使用压力无标度数据确定，不仅可以再现冲击压缩数据，而且零压力的热力学性质具有显着的精度。以前的模型为铜，银，MgO的EOS被构造为基础的旧的冲击压缩数据被发现低估的压力严重（高达类似于12%，在200 GPa和300 K）。此外，我们重新确定的状态方程模型铂（Pt）通过相同的程序。Au和Pt的测定模型高度一致，在广泛的P，T范围内提供了相当可比的压力值。预计这些将是比以前的模型更可靠的主要压力标准。
Equation of state of gold (Au) is revised using the remeasured shock compression data at pressures up to 580 GPa with including the electronic free-energy contribution. The model, even though determined only using pressure-scale-free data, can reproduce not only the shock compression data but also the zero-pressure thermodynamic properties with remarkable accuracy. Previous models for the EOS of copper, silver, and MgO that were constructed using as a basis old shock compression data are found to underestimate the pressure seriously (up to similar to 12% at 200 GPa and 300 K). Moreover, we redetermine the EOS model of platinum (Pt) through the same procedure. The determined models of Au and Pt are found mutually highly consistent, which provide quite comparable pressure values in extensive P, T range. These are expected to be more reliable primary pressure standards than previous models.