Orientational Order of Guest H2S Molecules in β-Quinol Clathrate

Shoji Hirokawa, Tomoko Imasaka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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
Volume57
Issue number11
DOIs
Publication statusPublished - 1988

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clathrates
statistical mechanics
molecules
dipole moments
infrared spectra
phase diagrams
specific heat
temperature dependence
interactions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Orientational Order of Guest H2S Molecules in β-Quinol Clathrate. / Hirokawa, Shoji; Imasaka, Tomoko.

In: Journal of the Physical Society of Japan, Vol. 57, No. 11, 1988, p. 3843-3850.

Research output: Contribution to journalArticle

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