EPR in single crystals of nickel doped ZnSiF6⋅6H2O has been studied at Ku band. The crystal field parameter D was found to vary from (−0.1325±0.0010)cm−1 at 4.2 °K to (−0.64±0.01)cm−1 at 302 °K. The magnitude of ∂D/∂T had a maximum of (0.0027±0.0001)cm−1/°K, decreasing to about 0.0015 cm−1/°K at room temperature. The spin–lattice relaxation rate was determined to vary as T2 from linewidth measurements between 77 and 325 °K. From the expression for the Raman process in the high temperature limit, the Debye temperature was deduced to be of the order of 100 °K.
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Rubins et al. (1977) studied this question.
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