Dynamical Properties of the Partially Disordered Crystals of Cs₅H₃(SO₄)₄·xH₂O

Authors: Fedoseev A.I.¹; Lushnikov S.G.¹; Gvasaliya S.N.¹; Ko J.-H.²; Kojima S.²; Shuvalov L.A.³

Source: Ferroelectrics, Volume 285, Number 1, 2003 , pp. 119-132(14)

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Abstract:

This paper presents studies of lattice dynamics of a crystal of Cs₅H₃(SO₄)₄·xH₂O (PCHS) and its deuterated analog Cs₅D₃(SO₄)₄·xD₂O (DPCHS) in wide temperature and frequency ranges by dielectric spectroscopy and modulated temperature differential scanning calorimetry. It is shown that deuteration of PCHS gives rise to an additional structural phase transition at T_c3

250 K. The temperature of the isostrctural phase transition T_c2 (372 K for PCHS and 370 K for DPCHS) has been determined more accurately. It has been found that deuteration does not suppress phase transition at T_c2. The temperature dependence of dielectric response is analyzed.

Keywords: Superprotonic conductivity; dielectric spectroscopy; differential calorimetry

Document Type: Research article

Affiliations: 1: A. F. Ioffe Physical Technical Institute, Russian Academy of Science, 194021 St.Petersburg, Russia 2: Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan 3: Institute of Crystallography, Russian Academy of Science, 117333 Moscow, Russia

Publication date: 2003-01-01