Al-Si ordering in the framework of leucite and Cs-exchanged leucite

Tetsuo Takaishi, Satoshi Yamazaki, Atsushi Yamazaki

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Ordered distributions of Al atoms in the frameworks of leucite and Cs-exchanged leucite (pollucite) are determined, under the restriction of the Al-O-Al avoidance rule. The observed 29Si MAS NMR spectra of pseudo-tetragonal leucite and Cs-exchanged leucite cannot be explained by an Al-configuration of tetragonal symmetry, but are consistently explained by one of P1121/a symmetry. On the other hand, an XRD pattern of a single crystal of leucite supports pseudo-tetragonal symmetry. This discrepancy is interpreted by the pseudo-tetragonal crystal consisting of twins of monoclinic microcrystallites. A detailed analysis of the 29Si MAS NMR spectrum of Cs-exchanged leucite of the high temperature phase (pseudo-cubic) shows that the domain size of the monoclinic phase is only several unit cells. The origin of an abnormal twist of the framework of tetragonal leucite and a driving force to transform it to the pseudo-cubic phase at higher temperature are discussed. The degree of the long-range order, S, is newly defined for this system, and estimated from 29Si MAS NMR data as S = ca. 0.8.

    Original languageEnglish
    Pages (from-to)3078-3084
    Number of pages7
    JournalPhysical Chemistry Chemical Physics
    Volume4
    Issue number13
    DOIs
    Publication statusPublished - 2002

    Fingerprint

    nuclear magnetic resonance
    symmetry
    avoidance
    Nuclear magnetic resonance
    constrictions
    single crystals
    configurations
    cells
    Crystal symmetry
    crystals
    atoms
    leucite
    Single crystals
    Atoms
    Temperature
    Crystals

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Atomic and Molecular Physics, and Optics

    Cite this

    Al-Si ordering in the framework of leucite and Cs-exchanged leucite. / Takaishi, Tetsuo; Yamazaki, Satoshi; Yamazaki, Atsushi.

    In: Physical Chemistry Chemical Physics, Vol. 4, No. 13, 2002, p. 3078-3084.

    Research output: Contribution to journalArticle

    Takaishi, Tetsuo ; Yamazaki, Satoshi ; Yamazaki, Atsushi. / Al-Si ordering in the framework of leucite and Cs-exchanged leucite. In: Physical Chemistry Chemical Physics. 2002 ; Vol. 4, No. 13. pp. 3078-3084.
    @article{a5a856dcabfe40d7b29ce2bc92bfaa45,
    title = "Al-Si ordering in the framework of leucite and Cs-exchanged leucite",
    abstract = "Ordered distributions of Al atoms in the frameworks of leucite and Cs-exchanged leucite (pollucite) are determined, under the restriction of the Al-O-Al avoidance rule. The observed 29Si MAS NMR spectra of pseudo-tetragonal leucite and Cs-exchanged leucite cannot be explained by an Al-configuration of tetragonal symmetry, but are consistently explained by one of P1121/a symmetry. On the other hand, an XRD pattern of a single crystal of leucite supports pseudo-tetragonal symmetry. This discrepancy is interpreted by the pseudo-tetragonal crystal consisting of twins of monoclinic microcrystallites. A detailed analysis of the 29Si MAS NMR spectrum of Cs-exchanged leucite of the high temperature phase (pseudo-cubic) shows that the domain size of the monoclinic phase is only several unit cells. The origin of an abnormal twist of the framework of tetragonal leucite and a driving force to transform it to the pseudo-cubic phase at higher temperature are discussed. The degree of the long-range order, S, is newly defined for this system, and estimated from 29Si MAS NMR data as S = ca. 0.8.",
    author = "Tetsuo Takaishi and Satoshi Yamazaki and Atsushi Yamazaki",
    year = "2002",
    doi = "10.1039/b111447f",
    language = "English",
    volume = "4",
    pages = "3078--3084",
    journal = "Physical Chemistry Chemical Physics",
    issn = "1463-9076",
    publisher = "Royal Society of Chemistry",
    number = "13",

    }

    TY - JOUR

    T1 - Al-Si ordering in the framework of leucite and Cs-exchanged leucite

    AU - Takaishi, Tetsuo

    AU - Yamazaki, Satoshi

    AU - Yamazaki, Atsushi

    PY - 2002

    Y1 - 2002

    N2 - Ordered distributions of Al atoms in the frameworks of leucite and Cs-exchanged leucite (pollucite) are determined, under the restriction of the Al-O-Al avoidance rule. The observed 29Si MAS NMR spectra of pseudo-tetragonal leucite and Cs-exchanged leucite cannot be explained by an Al-configuration of tetragonal symmetry, but are consistently explained by one of P1121/a symmetry. On the other hand, an XRD pattern of a single crystal of leucite supports pseudo-tetragonal symmetry. This discrepancy is interpreted by the pseudo-tetragonal crystal consisting of twins of monoclinic microcrystallites. A detailed analysis of the 29Si MAS NMR spectrum of Cs-exchanged leucite of the high temperature phase (pseudo-cubic) shows that the domain size of the monoclinic phase is only several unit cells. The origin of an abnormal twist of the framework of tetragonal leucite and a driving force to transform it to the pseudo-cubic phase at higher temperature are discussed. The degree of the long-range order, S, is newly defined for this system, and estimated from 29Si MAS NMR data as S = ca. 0.8.

    AB - Ordered distributions of Al atoms in the frameworks of leucite and Cs-exchanged leucite (pollucite) are determined, under the restriction of the Al-O-Al avoidance rule. The observed 29Si MAS NMR spectra of pseudo-tetragonal leucite and Cs-exchanged leucite cannot be explained by an Al-configuration of tetragonal symmetry, but are consistently explained by one of P1121/a symmetry. On the other hand, an XRD pattern of a single crystal of leucite supports pseudo-tetragonal symmetry. This discrepancy is interpreted by the pseudo-tetragonal crystal consisting of twins of monoclinic microcrystallites. A detailed analysis of the 29Si MAS NMR spectrum of Cs-exchanged leucite of the high temperature phase (pseudo-cubic) shows that the domain size of the monoclinic phase is only several unit cells. The origin of an abnormal twist of the framework of tetragonal leucite and a driving force to transform it to the pseudo-cubic phase at higher temperature are discussed. The degree of the long-range order, S, is newly defined for this system, and estimated from 29Si MAS NMR data as S = ca. 0.8.

    UR - http://www.scopus.com/inward/record.url?scp=0036088669&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0036088669&partnerID=8YFLogxK

    U2 - 10.1039/b111447f

    DO - 10.1039/b111447f

    M3 - Article

    AN - SCOPUS:0036088669

    VL - 4

    SP - 3078

    EP - 3084

    JO - Physical Chemistry Chemical Physics

    JF - Physical Chemistry Chemical Physics

    SN - 1463-9076

    IS - 13

    ER -