Kapustnik O. Influence of composition on physical properties of the group of AIIBVI:Cr2+,Fe2+ laser single crystals.

Current thesis is devoted to the research of the influence of the cation composition of semiconductor crystals of Zn1-xMgxSe:Cr2+ substitution solid solutions and Cd1-xMnxTe:Fe2+ doped with divalent transition metal ions (Cr2+, Fe2+) on their physical properties. The influence of the Ag+ acceptor impurity on the value of optical transparency of CdSe:(Cr2+, Ag+) crystals in the IR range of Cr2+ ion luminescence was determined. The mechanical properties of Cd1-xMnTe:Fe2+ and Zn1-xMgxSe:Cr2+ crystals were studied, and the effect of chromium doping on the microhardness of Zn1-xMgxSe crystals was determined. The concentration and temperature (300-550K) dependencies of thermophysical characteristics were obtained and the specific heat capacity and thermal conductivity coefficients of Zn1-xMgxSe crystals were determined. The physical mechanism of the spectral bands shift of IR absorption and luminescence of active chromium or iron ions depending on the cation composition of the ternary compounds Zn1-xMgxSe:Cr2+ and Cd1-xMnxTe:Fe2+ has been established. The generation properties of Zn1-xMgxSe:Cr2+ (0.2 <x <0.3) elements, Cd1-xMnxTe: Fe2+ ( x=0.1, 0.76) elements and CdSe:(Cr2+, Ag+) crystals were investigated. Key words: AIIBVI semiconductor single crystals, CdSe:Cr2+ binary compound, Zn1-xMgxSe:Cr2+ and Cd1-xMnxTe:Fe2+ crystals, solid substitution solution, doping, TM2+ ion luminescence, average IR range, middle IR range.