Orientational Order of Guest H2S Molecules in β-Quinol Clathrate

Shoji Hirokawa, Tomoko Imasaka

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    The orientational ordering of guest H2S molecules is studied using a mean-field theory on the basis of quantum statistical mechanics; it is assumed that the guest system is a quenched one consisting of a normal mixture of ortho and para H2S, and that the guest molecules which are influenced by a crystalline field, of which strength is estimated from far-infrared spectra, couple with one another via dipolar interactions. A phase diagram based on an effective dipole moment p is obtained. It shows: If p = 0.800D, a second-order transition between a partially disordered and a disordered phase occurs at T = 15.2 K, and the temperature dependence of the heat capacity well coincides with experiment; if p < 0.778D, no cooperative order is expected.

    Original languageEnglish
    Pages (from-to)3843-3850
    Number of pages8
    Journaljournal of the physical society of japan
    Issue number11
    Publication statusPublished - Jan 1 1988

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)


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