P-V-T equation of state of Na-majorite to 21 GPa and 1673 K
P-V-T equation of state of Na-majorite to 21 GPa and 1673 K
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DOI：
10.1016/j.pepi.2013.11.005
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发表时间：
2014-02-01
影响因子：
2.3
通讯作者：
Funakoshi, Kenichi
中科院分区：
文献类型：
--
作者：
Dymshits, Anna M.;Litasov, Konstantin D.;Funakoshi, Kenichi
用Kawai型多砧装置进行了Na-镁合金的原位X射线衍射实验，得到了压力为21 GPa、温度为1673 K时的P-V-T状态方程。对三阶Birch-Murnaghan EoS的室温P-V数据的分析得出环境晶胞体积，V-0 = 1476（1）（埃（3））;等温体积模量，K-0，K-300 = 181（9）GPa;以及其压力导数，K-0，K-300' = 4.4（1.2）。当在固定的V-0 = 1475.88埃（3），K-0，K-300 184（4）GPa，K-0，K-300' = 3.8（6），（偏导数K-0，K-T/偏导数T）（p）= -0.023（5）（GPa K-1），a = 3.17（16）× 10（-5）K-1，B = 0.16（26）× 10（-8）K-2，其中alpha = a + bT是体积热膨胀系数。将Mie-Gruneisen-Debye EoS与德拜温度（00 = 890 K）拟合得到Gruneisen参数，γ（0）= 1.35，q = 1.0（固定）。对钠镁橄榄石的新数据与镁橄榄石型石榴石的以前的数据进行了比较。详细阐述了石榴子石的压缩机制。整个数据集能够检查重要的地幔石榴石的热弹性性质，这些数据将有进一步的应用程序建模的P-T条件在过渡区的地球地幔使用超深矿物组合。(C)2013爱思唯尔有限公司版权所有。
The P-V-T equation of state (EoS) for Na-majorite at pressures to 21 GPa and temperatures to 1673 K was obtained from in situ X-ray diffraction experiments using a Kawai-type multi-anvil apparatus. Analyses of the room-temperature P-V data to a third-order Birch-Murnaghan EoS yielded ambient unit cell volume, V-0 = 1476 (1) (angstrom(3)); isothermal bulk modulus, K-0,K-300 = 181 (9) GPa; and its pressure derivative, K-0,K-300' = 4.4 (1.2). When fitting a high-temperature Birch-Murnaghan EoS using entire P-V-T data at a fixed V-0 = 1475.88 angstrom(3), K-0,K-300 184 (4) GPa, K-0,K-300' = 3.8 (6), (partial derivative K-0,K-T/partial derivative T)(p) = -0.023 (5) (GPa K-1), and a = 3.17 (16) x 10(-5) K-1, b = 0.16 (26) x 10(-8) K-2, where alpha = a + bT is the volumetric thermal expansion coefficient. Fitting the Mie-Gruneisen-Debye EoS with the present data to Debye temperature fixed at 00 = 890 K yielded Gruneisen parameter, gamma(0) = 1.35 at q = 1.0 (fixed). The new data on Na-majorite were compared with the previous data on majorite type garnets. The compression mechanism of majoritic garnets was described in detail. The entire dataset enabled to examine the thermoelastic properties of important mantle garnets and these data will have further applications for modeling P-T conditions in the transition zone of the Earth's mantle using ultradeep mineral assemblages. (C) 2013 Elsevier B.V. All rights reserved.