EPR and luminescence of Mn2+ in distorted tetrahedral symmetry in CaZnF4 crystals

Small crystals of CaZnF4 with scheelite‐type structure, doped with about 1% Mn are obtained from the melt by the Bridgman method with subsequent annealing at 725 °C, 50 K below a reversible phase transformation detected by DTA. Mn2+ exclusively occupies Zn sites as evident from the size of the hyperfine splitting constant. The intrinsic zero field splitting parameter of second order obtained from superposition analysis is in the same range as that for [MnF6]4− units. The luminescence spectra do not serve as a critical test for distinction between four‐ and eightfold coordination.