高压下天然顽火辉石能量色散X射线粉末衍射研究

马麦宁; 周文戈; 刘景; 李延春; 李晓东

doi:10.11858/gywlxb.2007.03.010

高压下天然顽火辉石能量色散X射线粉末衍射研究

doi: 10.11858/gywlxb.2007.03.010

1.
中国科学院研究生院计算地球动力学实验室，北京 100049；
2.
中国科学院地球化学研究所，贵州贵阳 550002；
3.
中国科学院高能物理研究所，北京 100049

详细信息

通讯作者:
马麦宁

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出版历程
- 收稿日期: 2006-09-01
- 修回日期: 2006-12-07
- 发布日期: 2007-09-05

Energy Dispersive X-Ray Powder Diffraction of Natural Enstatite under High Pressure Conditions

1.
Laboratory of Computational Geodynamics, Graduate University of Chinese Academy of Science, Beijing 100049, China;
2.
Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China;
3.
Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, China

More Information

Corresponding author: MA Mai-Ning

摘要

摘要: 在北京同步辐射装置（BSRF）高压站对采自于河北大麻坪的天然顽火辉石，在室温高压（0~31.64 GPa）下，利用金刚石压腔装置（DAC），进行了能量色散X射线粉末衍射（EDXD）原位测量，得到了顽火辉石在不同压力下的衍射图谱，并利用UnitCell软件进行解谱，获得了其晶胞参数a、b、c和晶胞体积V及其随压力的变化，最后利用Murnaghan等温方程得到了天然顽火辉石的体积模量KT(0)=172 GPa、压缩系数及p-V状态方程，发现沿a、b、c三方向的压缩系数存在明显的各向异性，结果与斜方辉石的弹性波速各向异性完全一致。
- 顽火辉石 /
- 金刚石压腔装置 /
- 能量色散X射线粉末衍射（EDXD） /
- 状态方程 /
- 压缩系数
Abstract: Using synchrotron radiation and diamond anvil cell (DAC) in high pressure research station of Beijing Synchrotron Radiation Facility (BSRF), energy dispersive X-ray powder diffraction (EDXD) of the natural enstatite collected from Damapin in Hebei Province, have been in situ measured under room temperature and high pressure (0~31.64 GPa) conditions. Then the unit-cell parameters of sample and their changes versus pressure have been acquired using the UnitCell software. Furthermore, basing on Murnaghan equation of state (EOS), bulk modulus KT(0)=172 GPa, compression coefficient, and p-V equation of state of natural enstatite have been obtained. The experiment data show that compression coefficient have distinct anisotropy for the three crystallographic axis. This result is consistent with the anisotropy of elastic velocity of orthopyroxene.
- enstatite /
- diamond anvil cell /
- energy dispersive X-ray diffraction (EDXD) /
- equation of state /
- compression coefficient

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