A new high pressure phase of SiO2 formed by hydrostatic compression of cristobalite. Effect of non-hydrostatic stress on the crystal lattice.

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  • クリストバライトの静水圧圧縮により得られるＳｉＯ２の新しい高圧相　　結晶格子に与える静水圧性の影響
  • クリストバライト ノ セイスイアツ アッシュク ニ ヨリ エラレル SiO2 ノ アタラシイ コウアツソウ ケッショウ ゴウシ ニ アタエル セイスイアツセイ ノ エイキョウ

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Cristobalite was compressed under various degree of hydrostaticity in this work. It was clarified that, under high pressure, non-hydrostatic stress affects the crystal structure of high pressure polymorph. A new polymorph of SiO2 was formed under quasi-hydrostatic compression of cristobalite. While the crystal structure of this new polymorph is very similar to that of rutile-type, lattice parameters are different from that of stishovite. No systematic study to clarify the effects of non-hydrostatic stress has ever been made. The effect of non-hydrostatic stress on the crystal lattice was discussed in this paper.

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