高圧地球科学のフロンティア　　シーザー加熱ＤＡＣを用いた高温高圧力実験と放射光実験の進歩

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A laser heated diamond anvil cell (LHDAC) is a powerful tool to investigate the Earth's deep interior. Recent advances and problems of synchrotron experiments are reviewed in this paper. An on-line temperature and pressure measurement system was developed for effective laser heating experiments. High temperature reduction of iron bearing material was discussed also. The results of an in-situ powder X-ray diffraction experiment are shown for SiO2 and (Mg, Fe)O. Stishovite transforms to a CaCl2-structured phase at about 55 GPa and the phase was stable up to 80 GPa and 2000°C. A rhombohedral distortion of magnesiowüsutite was observed for (Mg, Fe)O. The positive phase boundary between rocksalt and the rhombohedral phase continues over 100 GPa.
日本高圧力学会の論文