EPR of cadmium ferric voltaite above the ferrimagnetic transition |
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Authors: | A. Nazarian Y.H. Shing D. Walsh G. Donnay |
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Affiliation: | Eaton Electronics Laboratory, McGill University, Montreal, Canada;Department of Geological Sciences, McGill University, Montreal, Canada |
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Abstract: | A single isotropic EPR line of Fe3+ in synthetic cadmium ferric voltaite, (NH4)2Cd5Fe3Al(SO4)12 · 18H2O, was observed in a wide temperature range from 295 to 1.57°K. The ferrimagnetic transition temperature of CdFe voltaite was determined to be ~ 0.7°K using the temperature dependence of the g-factor and the line width. The cubic crystal field parameter, a, for Fe3+ in CdFe voltaite is extracted from the EPR line width measurement using the exchange-narrowed line width model of Anderson and Weiss. The parameter a for Fe3+ in CdFe voltaite at 4.2°K is 157 × 10-4cm-1 which is consistent with the corresponding values for Fe3+ in other cubic structures. |
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