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首页> 外文期刊>Geophysical Research Letters >HIGH-PRESSURE AND HIGH-TEMPERATURE IN SITU X-RAY DIFFRACTION STUDY OF IRON TO ABOVE 30 GPA USING MA8-TYPE APPARATUS
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HIGH-PRESSURE AND HIGH-TEMPERATURE IN SITU X-RAY DIFFRACTION STUDY OF IRON TO ABOVE 30 GPA USING MA8-TYPE APPARATUS

机译：MA8型装置对铁在30 GPA以上进行铁的高压高温X射线衍射研究

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摘要

In situ x-ray diffraction experiments on iron at pressures of 22 - 32 GPa and temperatures of 300 - 1500 K were carried out using an MA8-type high-pressure apparatus, employing sintered diamond anvils, combined with synchrotron radiation. No phases other than epsilon(hcp) and gamma(fcc) were observed in this pressure and temperature range. It became clear that non-hydrostaticity or chemical reaction with hydrogen causes serious problems in high-pressure and high-temperature x-ray diffraction study on iron. The average thermal expansivity of epsilon phase between 300 K and 1000 K and the zero-pressure bulk modulus of gamma phase at 1400 K were determined by assuming that no chemical reaction occurred in the present study. The thermal expansivities of epsilon iron at 22 GPa and 32 GPa are determined to be 3.88x10(-5) K-1 and 3.16x10(-5) K-1, respectively. In this case, the volume at 22 - 32 GPa and room temperature is about 1% larger than the literature value. The bulk modulus of gamma iron is determined to be 120 GPa, when its pressure derivative is fixed at 5. [References: 19]
机译：使用MA8型高压设备，采用烧结金刚石砧，结合同步加速器辐射，在22-32 GPa的压力和300-1500 K的温度下对铁进行原位X射线衍射实验。在此压力和温度范围内，未观察到ε（hcp）和γ（fcc）以外的相。显然，在铁的高压和高温X射线衍射研究中，非流体静力学或与氢的化学反应引起严重问题。假设在本研究中未发生化学反应，则可以确定ε相在300 K和1000 K之间的平均热膨胀系数和γ相在1400 K下的零压力体积模量。 ε铁在22 GPa和32 GPa时的热膨胀系数分别确定为3.88x10（-5）K-1和3.16x10（-5）K-1。在这种情况下，在22-32 GPa和室温下的体积比文献值大1％。当伽玛铁的压力导数固定为5时，其体积模量确定为120 GPa。[参考文献：19]

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