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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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|
|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|
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