Crystallographic relationship between the ¯ (Mn82Si18) and H (Mn7Si2V) phases in the Mn-Si-V alloy system

Kei Nakayama, Daichi Kurihara, Yasumasa Koyama

    Research output: Contribution to journalArticle


    There are the intermetallic-compound ¯ (Mn82Si18) and H (Mn7Si2V) phases in the Mn-Si-V alloy system. These two phases can be regarded as approximant phases of the dodecagonal quasicrystal, and their crystal structures involve similar structural hierarchies consisting of dodecagonal atomic columns and giant dodecagonal structural units. To understand the crystallographic relationship between these approximant phases, we examined their crystallographic features mainly by transmission electron microscopy. It was found that there is a simple orientation relationship of N(001)¯ // N(0001)H and N(010)¯ // N(0110 )H between the ¯ and H structures. In addition, H-structure regions have an antiphase boundary with a 3 phase shift along a column axis as a structural defect. A notable feature of the antiphase boundary is that it consists of decagonal columns, not dodecagonal columns present in the H structure, where both 11 dodecagonal columns and eight decagonal columns form one dodecagonal unit in the ¯ structure. The ¯ structure can thus be produced in the following two steps. First, eight outer dodecagonal columns in each dodecagonal unit in the H structure are replaced by eight decagonal columns. The second step is the periodic introduction of antiphase boundaries, consisting of decagonal columns present in the replacement.

    Original languageEnglish
    Pages (from-to)1051-1056
    Number of pages6
    JournalMaterials Transactions
    Issue number7
    Publication statusPublished - 2018 Jan 1


    • Intermetallic compounds
    • Manganese-silicon-vanadium alloy system
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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