Crystallographic features of the approximant H (Mn7Si2V) phase in the Mn–Si–V alloy system

Kei Nakayama, Takumi Komatsuzaki, Yasumasa Koyama

    Research output: Contribution to journalArticle

    Abstract

    The intermetallic compound H (Mn7Si2V) phase in the Mn–Si–V alloy system can be regarded as an approximant phase of the dodecagonal quasicrystal as one of the two-dimensional quasicrystals. To understand the features of the approximant H phase, in this study, the crystallographic features of both the H phase and the (σ → H) reaction in Mn–Si–V alloy samples were investigated, mainly by transmission electron microscopy. It was found that, in the H phase, there were characteristic structural disorders with respect to an array of a dodecagonal structural unit consisting of 19 dodecagonal atomic columns. Concretely, penetrated structural units consisting of two dodecagonal structural units were presumed to be typical of such disorders. An interesting feature of the (σ → H) reaction was that regions with a rectangular arrangement of penetrated structural units (RAPU) first appeared in the σ matrix as the initial state, and H regions were then nucleated in contact with RAPU regions. The subsequent conversion of RAPU regions into H regions eventually resulted in the formation of the approximant H state as the final state. Furthermore, atomic positions in both the H structure and the dodecagonal quasicrystal were examined using a simple plane-wave model with 12 plane waves.

    Original languageEnglish
    Pages (from-to)1823-1847
    Number of pages25
    JournalPhilosophical Magazine
    Volume98
    Issue number20
    DOIs
    Publication statusPublished - 2018 Jul 13

    Fingerprint

    plane waves
    disorders
    intermetallics
    transmission electron microscopy
    matrices

    Keywords

    • approximants
    • Intermetallic compounds
    • quasicrystals
    • transmission electron microscopy

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Crystallographic features of the approximant H (Mn7Si2V) phase in the Mn–Si–V alloy system. / Nakayama, Kei; Komatsuzaki, Takumi; Koyama, Yasumasa.

    In: Philosophical Magazine, Vol. 98, No. 20, 13.07.2018, p. 1823-1847.

    Research output: Contribution to journalArticle

    @article{e671b0fa7f154dc7bc1ac2cc030adab8,
    title = "Crystallographic features of the approximant H (Mn7Si2V) phase in the Mn–Si–V alloy system",
    abstract = "The intermetallic compound H (Mn7Si2V) phase in the Mn–Si–V alloy system can be regarded as an approximant phase of the dodecagonal quasicrystal as one of the two-dimensional quasicrystals. To understand the features of the approximant H phase, in this study, the crystallographic features of both the H phase and the (σ → H) reaction in Mn–Si–V alloy samples were investigated, mainly by transmission electron microscopy. It was found that, in the H phase, there were characteristic structural disorders with respect to an array of a dodecagonal structural unit consisting of 19 dodecagonal atomic columns. Concretely, penetrated structural units consisting of two dodecagonal structural units were presumed to be typical of such disorders. An interesting feature of the (σ → H) reaction was that regions with a rectangular arrangement of penetrated structural units (RAPU) first appeared in the σ matrix as the initial state, and H regions were then nucleated in contact with RAPU regions. The subsequent conversion of RAPU regions into H regions eventually resulted in the formation of the approximant H state as the final state. Furthermore, atomic positions in both the H structure and the dodecagonal quasicrystal were examined using a simple plane-wave model with 12 plane waves.",
    keywords = "approximants, Intermetallic compounds, quasicrystals, transmission electron microscopy",
    author = "Kei Nakayama and Takumi Komatsuzaki and Yasumasa Koyama",
    year = "2018",
    month = "7",
    day = "13",
    doi = "10.1080/14786435.2018.1459058",
    language = "English",
    volume = "98",
    pages = "1823--1847",
    journal = "Philosophical Magazine",
    issn = "1478-6435",
    publisher = "Taylor and Francis Ltd.",
    number = "20",

    }

    TY - JOUR

    T1 - Crystallographic features of the approximant H (Mn7Si2V) phase in the Mn–Si–V alloy system

    AU - Nakayama, Kei

    AU - Komatsuzaki, Takumi

    AU - Koyama, Yasumasa

    PY - 2018/7/13

    Y1 - 2018/7/13

    N2 - The intermetallic compound H (Mn7Si2V) phase in the Mn–Si–V alloy system can be regarded as an approximant phase of the dodecagonal quasicrystal as one of the two-dimensional quasicrystals. To understand the features of the approximant H phase, in this study, the crystallographic features of both the H phase and the (σ → H) reaction in Mn–Si–V alloy samples were investigated, mainly by transmission electron microscopy. It was found that, in the H phase, there were characteristic structural disorders with respect to an array of a dodecagonal structural unit consisting of 19 dodecagonal atomic columns. Concretely, penetrated structural units consisting of two dodecagonal structural units were presumed to be typical of such disorders. An interesting feature of the (σ → H) reaction was that regions with a rectangular arrangement of penetrated structural units (RAPU) first appeared in the σ matrix as the initial state, and H regions were then nucleated in contact with RAPU regions. The subsequent conversion of RAPU regions into H regions eventually resulted in the formation of the approximant H state as the final state. Furthermore, atomic positions in both the H structure and the dodecagonal quasicrystal were examined using a simple plane-wave model with 12 plane waves.

    AB - The intermetallic compound H (Mn7Si2V) phase in the Mn–Si–V alloy system can be regarded as an approximant phase of the dodecagonal quasicrystal as one of the two-dimensional quasicrystals. To understand the features of the approximant H phase, in this study, the crystallographic features of both the H phase and the (σ → H) reaction in Mn–Si–V alloy samples were investigated, mainly by transmission electron microscopy. It was found that, in the H phase, there were characteristic structural disorders with respect to an array of a dodecagonal structural unit consisting of 19 dodecagonal atomic columns. Concretely, penetrated structural units consisting of two dodecagonal structural units were presumed to be typical of such disorders. An interesting feature of the (σ → H) reaction was that regions with a rectangular arrangement of penetrated structural units (RAPU) first appeared in the σ matrix as the initial state, and H regions were then nucleated in contact with RAPU regions. The subsequent conversion of RAPU regions into H regions eventually resulted in the formation of the approximant H state as the final state. Furthermore, atomic positions in both the H structure and the dodecagonal quasicrystal were examined using a simple plane-wave model with 12 plane waves.

    KW - approximants

    KW - Intermetallic compounds

    KW - quasicrystals

    KW - transmission electron microscopy

    UR - http://www.scopus.com/inward/record.url?scp=85045770362&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85045770362&partnerID=8YFLogxK

    U2 - 10.1080/14786435.2018.1459058

    DO - 10.1080/14786435.2018.1459058

    M3 - Article

    VL - 98

    SP - 1823

    EP - 1847

    JO - Philosophical Magazine

    JF - Philosophical Magazine

    SN - 1478-6435

    IS - 20

    ER -