Esr study of (SO4)2- dynamics in relation to the ferroelectric phase transition in ammonium sulfate

Bhat, SV and Mishra, NC and Srinivasan, R (1982) Esr study of (SO4)2- dynamics in relation to the ferroelectric phase transition in ammonium sulfate. In: Journal of Physics and Chemistry of Solids, 43 (12). pp. 1157-1164.

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Abstract

Ferroelectric phase transition in ammonium sulfate has been studied by ESR of CrO43- radical substituting for SO42- ion in (NH4)2SO4. In addition to discontinuous changes at Tc, certain continuous changes are observed in ESR parameters of this probe below Tc, which reflect the role of the sulfate ion in the phase transition. A microscopic mechanism of the phase transition is proposed and discussed in terms of the change of orientation of the sulfate tetrahedron through a finite angle. The degree of the change of orientation below Tc is thought to be the possible order parameter of the phase transition.

Item Type:	Journal Article
Publication:	Journal of Physics and Chemistry of Solids
Publisher:	Elsevier Science.
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Jul 2009 08:52
Last Modified:	19 Sep 2010 05:37
URI:	http://eprints.iisc.ac.in/id/eprint/21523

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