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EPR Investigations of Phase Transitions in Lithium Potassium Sulfate: $LiKSO_4$

Murthy, Kumari and Ramesh, Usha and Bhat, SV (1986) EPR Investigations of Phase Transitions in Lithium Potassium Sulfate: $LiKSO_4$. In: Journal of Physics and Chemistry of Solids, 47 (9). pp. 927-931.

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Abstract

Single crystal EPR studies of $NH^+_3$ doped in the $K^+$ sites of lithium potassium sulfate (LKS) have been carried out from room temperature down to −150°C. The spin Hamiltonian parameters have been evaluated for the three phases which occur in this temperature range, P I (room temperature) $(A_N)_{XX}$ = $(A_N)_{YY}$ = 23.2 G and $(A_N)_{ZZ}$ = 10.4 G; P II (below −69°C) $(A_N)_{XX}$ = $(A_N)_{XX}$ = 22.3 G and $(A_N)_{ZZ}$ = 11.7 G; P III (below −83°C) $(A_N)_{XX}$ = 8.9 G, $(A_N)_{YY}$ = 20.8 G and $(A_N)_{ZZ}$ = 25.9 G. The P I–P II transition at −69° C is rather sluggish and shows a mixed phase for 2.5–3 h. In P III the principal component $(A_N)_{ZZ}$ moves out by an angle of 1.4° from the b-axis. The space group of this phase is most probably not $Cmc2_1$.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science Ltd.
Keywords: EPR;LiKSO4;NH+3 impurity;low temperature phase transitions
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 14 Mar 2008
Last Modified: 19 Sep 2010 04:43
URI: http://eprints.iisc.ernet.in/id/eprint/13395

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