Abstract
A liquid-helium temperature study of Fe 2+ and Mn 2+ ions has been carried out on a single crystal of Fe 2+-doped ZnSiF 6·6H 2O at 5–35 K at 170, 222.4 and 333.2 GHz. The spectra are found to be an overlap of two magnetically inequivalent Fe 2+ ions, as well as that of an Mn 2+ ion. From the simulation of the EPR line positions for the Fe 2+ (d 6, S = 2) ion the spin-Hamiltonian parameters were estimated for the two inequivalent Fe 2+ ions at the various temperatures. From the relative intensities of lines the absolute sign of the fine-structure parameters have been estimated. In addition, the fine-structure and hyperfine-structure spin-Hamiltonian parameters for the Mn 2+ ion, present as impurity at interstitial sites, were estimated from the hyperfine allowed and forbidden line positions. The particular virtues of such a single-crystal study vs. that on powders are noted.
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