Simultaneous volume measurements of Au and MgO to 140 GPa and thermal equation of state of Au based on the MgO pressure scale
Simultaneous volume measurements of Au and MgO to 140 GPa and thermal equation of state of Au based on the MgO pressure scale
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DOI：
10.1016/j.pepi.2008.03.002
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发表时间：
2008-04-01
影响因子：
2.3
通讯作者：
Ohishi, Yasuo
中科院分区：
文献类型：
--
作者：
Hirose, Kei;Sata, Nagayoshi;Ohishi, Yasuo
在金刚石压砧（DAC）装置上，利用同步辐射X射线衍射（XRD）方法，在压力11 ~ 140 GPa，温度300 ~ 2330 K的条件下，测定了Au和MgO的晶胞体积。MgO压力标度是目前最实用的压力标度，因此，得到与MgO压力标度一致的Au P-V-T状态方程是很有意义的。在此，我们基于本研究和Fei等人[Fei，Y.，李杰，Hirose，K.，Minarik，W.，货车奥曼，J.，桑卢角，Westrenen，W.V.，Komabayashi，T.，Funakoshi，K.，2004.通过现场X射线衍射测量对高温下压力标度的临界评价。地球物理中间截留143- 144，515 -526]使用MgO作为参考压力标度。新的规模预测更大的热压力比以前提出的热状态方程的Au，因此，在超过35 GPa的压力范围内，在1500 K以上的更高的压力。(C)2008 Elsevier B. V.保留所有权利。
We have determined the unit-cell volumes of Au and MgO by synchrotron X-ray diffraction (XRD) measurements at pressures between 11 and 140 GPa and temperatures from 300 to 2330 K in a diamond-anvil cell (DAC). Since the MgO pressure scale appears the most practical at present, it is useful to obtain the P-V-T equation of state of Au that is consistent with the MgO scale. Here we present the new Au pressure scale based on the simultaneously measured volume data of Au and MgO in this study and in Fei et al. [Fei, Y., Li, J., Hirose, K., Minarik, W., Van Orman, J., Sanloup, C., Westrenen, W.V., Komabayashi, T., Funakoshi, K., 2004. A critical evaluation of pressure scales at high temperatures by in situ X-ray diffraction measurements. Phys. Earth Planet. Inter. 143-144,515-526] using MgO as a reference pressure scale. The new scale predicts larger thermal pressure than previously proposed thermal equations of state of Au and therefore gives higher pressure above 1500 K in a pressure range exceeding 35 GPa. (C) 2008 Elsevier B.V. All rights reserved.