Crystal Structures of Long-Period Stacking Ordered Phase in the Mg-TM-RE System

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  • Kishida Kyosuke
    京都大学大学院工学研究科材料工学専攻 京都大学構造材料元素戦略研究拠点
  • Inui Haruyuki
    京都大学大学院工学研究科材料工学専攻 京都大学構造材料元素戦略研究拠点

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Other Title
  • 長周期積層構造を持つマグネシウム基金属間化合物の結晶構造
  • チョウ シュウキ セキソウ コウゾウ オ モツ マグネシウム キキンゾク カン カゴウブツ ノ ケッショウ コウゾウ

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Abstract

<p>Crystal structures of long-period stacking-ordered (LPSO) phases in the Mg-TM (transition-metal) -RE(rare-earth) systems were investigated by atomic resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and transmission electron microscopy (TEM). The 18R-type LPSO phase in the Mg-Al-Gd system is composed by stacking structural blocks with a fully-ordered atomic arrangement. However, the stacking of structural blocks does not exhibit any long-range order along the stacking direction. Because of these characteristics, the LPSO phase in the Mg-Al-Gd system cannot be described as an ‘LPSO’ phase any longer in a strict sense but as an order-disorder (OD) intermetallic phase with a so-called OD structure. Details of the crystal structure analysis of the Mg-Al-Gd LPSO phases are described on the basis of the OD theory.</p>

Journal

  • KENBIKYO

    KENBIKYO 49 (3), 181-189, 2014-12-30

    The Japanese Society of Microscopy

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