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High-temperature phase transition in RbH2PO4

Dielectric and thermal measurements were carried out for the RbH2PO4 crystal belonging to the tetragonal system at room temperature. The RbH2PO4 crystal, which could be obtained by heating the tetragonal RbH2PO4 crystal above the tetragonal-monoclinic transformation temperature, undergoes successive...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2000, Vol.69 (7), p.2076-2081
Main Authors: KOMUKAE, Masaru, KAWASHIMA, Kazuhiro, OSAKA, Toshio
Format: Article
Language:English
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Summary:Dielectric and thermal measurements were carried out for the RbH2PO4 crystal belonging to the tetragonal system at room temperature. The RbH2PO4 crystal, which could be obtained by heating the tetragonal RbH2PO4 crystal above the tetragonal-monoclinic transformation temperature, undergoes successive phase transitions at 390.1K and 248.8K. The tetragonal-monoclinic transformation is accompanied by a rearrangement of hydrogen bonds, namely, a change from a three-dimensional network of hydrogen bonds in tetragonal RbH2PO4 to a two-dimensional network in monoclinic one. The tetragonal space group {I\bar{4}2d} changes to the monoclinic P21/c by passing through the transformation temperature.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.69.2076