Abstract
A concentration series of (Pb0.67Cd0.33)1 – xMnxF2 + х (0 ≤ x ≤ 0.7) solid solution crystals and Cd0.93Mn0.07F2 crystal have been grown from melt by the vertical directional melt crystallization (Bridgman) method in a fluorinating atmosphere. Single-phase crystals with the fluorite structure are obtained by doping Pb0.67Cd0.33F2 with manganese fluoride up to 5 mol %. At higher MnF2 contents in the crystals, the tetragonal impurity phase, isostructural to the Ba2MF6 (M = Mn, Co, Zn) group of compounds, is precipitated. The optical absorption and luminescence of the Cd0.93Mn0.07F2 and (Pb0.67Cd0.33)0.95Mn0.05F2 crystals have been investigated. The absorption spectra indicate octahedral symmetry of the environment of Mn2+ ions in the ternary crystal (Pb0.67Cd0.33)0.95Mn0.05F2. The wide Mn2+ luminescence band in (Pb0.67Cd0.33)0.95Mn0.05F2, peaking at 605 nm, is observed only at 77 K.
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