# Phase transitions in rubidium hydrogen sulfate: crystal structures at 293 and 200 K

Nalini, G and Row, Guru TN (2003) Phase transitions in rubidium hydrogen sulfate: crystal structures at 293 and 200 K. In: Phase Transitions: A Multinational Journal, 76 (11). pp. 923-934.

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## Abstract

The crystal structure of the paraelectric phase of rubidium hydrogen sulfate has been redetermined at room temperature to be monoclinic with a = 14.3503(14), b = 4.6187(4), c = 14.3933(14) \AA, \beta = 118.03(1)° (space group $P2_1/n$). Both the sulfate groups are found to be ordered, unlike in previous reports. The crystal structure of the ferroelectric phase at 200 K belongs to the noncentrosymmetric space group Pn with a = 14.2667(12), b = 4.5878(4), c = 14.2924(12) \AA, \beta = 118.01(1)°, with distorted sulfate groups. The change in the Rb coordination is discussed in terms of bond-valence-sum calculations. Variable-temperature powder X-ray diffraction patterns at temperatures above 393 K indicate a possible reduction in symmetry, suggesting a phase transition.

Item Type: Journal Article The Copyright belongs to Taylor & Francis. Single Crystal;X-ray Diffraction;Ferroelectric Phase;Rubidium Bisulfate Division of Chemical Sciences > Solid State & Structural Chemistry Unit 25 Apr 2006 27 Aug 2008 11:55 http://eprints.iisc.ernet.in/id/eprint/6450