ESR Study of a Cr5+ Centre in Ferroelectric Ammonium Sulphate

Manjunath, CV and Srinivasan, R (1978) ESR Study of a Cr5+ Centre in Ferroelectric Ammonium Sulphate. In: Physica Status Solidi B, 87 (1). pp. 395-400.

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Abstract

X-band electron spin resonance (ESR) studies of (CrO4)2- doped, X-irradiated single crystals of ferroelectric ammonium sulphate ((NH4)2SO4, TC = 223 K) at 300 and 208 K are reported. The paramagnetic centre responsible for the ESR spectrum is identified to be Cr5+. Superhyperfine interaction of the unpaired electron with two equivalent protons is observed. The spin-Hamiltonian parameters which are nearly axial at 300 K, with g < g indicating a dx2-y2 orbital ground state, acquired rhombic character below TC indicating a distortion of the sulphate tetrahedron. An increase in the value of the proton superhyperfine constant in the ferroelectric phase is indicative of stronger hydrogen bonding.

Item Type:	Journal Article
Publication:	Physica Status Solidi B
Publisher:	John Wiley and Sons.
Additional Information:	Copyright of this article belongs to John Wiley and Sons.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	16 Dec 2009 11:02
Last Modified:	19 Sep 2010 05:52
URI:	http://eprints.iisc.ac.in/id/eprint/24936

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