マグネシウム珪酸塩高圧相の構造

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タイトル別名
  • High-pressure phases of magnesiumsilicates : single-cyrstal X-ray diffraction studies
  • マグネシウム ケイサンエン コウアツソウ ノ コウゾウ

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抄録

The structures of high-pressure phases of Mg2SiO4 and MgSiO3 are summarized based on the results of X-ray diffraction method using single crystals, and the relationships among their structures are discussed with configurations of polyhedra about cations. The α→β→γ phase transformations of Mg2SiO4, which are not accompanied with the change in coordination number of cations, are mainly characterized by the idealization and compression of MgO6 and _??_O6. The high-pressure phases of MgSiO3, ilmenite- and perovskite-types, have. SiO6 octahedra which show a slight expansion in the high-pressure phase. On the other hand, the coordination of Mg-polyhedra change remarkably in high-pressure phase. A linear correlation is observed between phase-transformation pressure and cation polyhedral volume. The Mg_??_Si disorder is not observed in any high-pressure phases of magnesiumsilicates. Effects of Fe2+ on the β- and γ-phase structures are also discussed.

収録刊行物

  • 鉱物学雜誌

    鉱物学雜誌 16 (Special), 199-206, 1983

    一般社団法人　日本鉱物科学会

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