Electron paramagnetic resonance in nickel fluosilicate

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Abstract
EPR data for NiSiF6⋅6H2O at Ku band and Ka band between 77 and 298 °K were fitted to an isotropic g value of approximately 2.25 with ‖D‖ varying from (0.166±0.005) cm−1 at 77 °K to (0.51±0.01) cm−1 at 298 °K. The values g∥=2.26±0.01 and ‖D‖= (0.125±0.005) cm−1 were obtained from a Ku band measurement at 4.2 °K. The magnitude of the temperature gradient ∂D/∂T had a broad maximum of about 1.8×10−3 cm−1/ °K near 200 °K, decreasing to about 1.5×10−3 cm−1/ °K near room temperature. The spin–lattice relaxation rate was determined from linewidth measurements to vary as T2 above 200 °K. From an expression for the Raman process in the high temperature limit, the Debye Temperature ϑD was deduced to be approximately 107 °K.