Abstract
Mn 2+-doped Fe(CIO 4) 2·6H 2O, Co(ClO 4) 2·6H 2O, and Ni(ClO 4) 2·6H 2O have been studied by EPR from room temperature to liquid nitrogen temperature. Mn 2+ replaces the metal ions at sites of trigonal symmetry. The EPR lines are broad and the D parameters are small; thus, there is considerable overlap in the spectra. The spectra are nearly axially symmetric. The temperature variation study shows phase transitions at 237 ± 5, 154.5 ± 6.5, and 223 ± 5 K in iron, cobalt, and nickel perchlorate hexahydrates, respectively.
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