Role of Twinning in Perovskite-Lithium Niobate Phase Transitions

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A number of ABO<SUB>3</SUB> compounds having the ilmenite structure at low pressures have been shown to transform to the orthorhombic perovskite structure at high pressures and temperatures. The compounds that exhibit this behavior contain cations having a relatively restricted range of radii and radius ratios, and include MnTiO<SUB>3</SUB>, FeTi<SUB>O3</SUB>, MgTiO<SUB>3</SUB>, MgGeO<SUB>3</SUB>, and MnSnO<SUB>3</SUB>. In addition, two silicates with mixed cation content show similar behavior. When these materials are quenched to ambient conditions, the products often are twinned crystals having the LiNbO<SUB>3</SUB> structure. It was thought originally that twinning was required in this transition, but examination of TEM photographs indicates the presence of untwinned regions of the LiNbO<SUB>3</SUB>-type phase. However, this structure appears to be metastable with respect to ilmenite. A<SUB>2</SUB>O<SUB>3</SUB> compounds such as Fe<SUB>2</SUB>O<SUB>3</SUB> also transform similarly to the perovskite structure at high pressures and temperatures, but the intermediate metastable form is different from the ABO<SUB>3</SUB> type. It has been predicted that this could be the Rh<SUB>2</SUB>O<SUB>3</SUB> II structure.

収録刊行物

  • 高圧力の科学と技術 = The Review of high pressure science and technology

    高圧力の科学と技術 = The Review of high pressure science and technology 7, 40-43, 1998

    The Japan Society of High Pressure Science and Technology

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各種コード

  • NII論文ID(NAID)
    10002688678
  • NII書誌ID(NCID)
    AN10452913
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0917639X
  • NDL 記事登録ID
    4493831
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z17-1589
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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