The microhardness of eleven AIBIIICVI2 semiconducting compounds and thatof their CuGaS2xSe2(1−x), CuInS2xSe2(1−x), CuGaxIn1−xS2, CuGaxIn1−xSe2, and AgGaxIn1−xS2 solid solutions is experimentally studied in the plane (112). The functional dependences of the microhardness on the molar mass and the melting temperature are determined for the starting compounds in terms of which the microhardness values for all the AIBIIICVI2 compounds are estimated. The Debye temperatures of the AIBIIICVI2 compounds are calculated using the Madelung‐Einstein and Linde‐mann relations taking into account the microhardness and melting temperatures, respectively. It is established that the increasing metallicity of the compounds results in the decrease of their mechanical strength and thermal stability. The functional dependence of microhardness on composition is found for the solid solutions. It is established that the microhardness maximum is observed for the composition determined by the ratio of the molar masses of the starting compounds with \documentclass{article}\pagestyle{empty}\begin{document}$ x_{\max} = 1 - 2\frac{{\mu _1 - \mu _2}}{{\mu _1 + \mu _2}}. $\end{document}. The values of xmax and the maximum value of micrhardness for a number of solid solutions with one component substitution (anionic and cationic) are calculated on the basis of the AIBIIICVI2 ternary compounds.

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The phonon modes of the ternary compounds CuGaS,, CuGaSe,, and the CuGaS,,Se,(l -x) solid solution are investigated by means of IR and Raman spectroscopy. The dependence of the frequences on the composition of the solid solutions is obtained. It is shown that the lattice vibrations of the solid solutions display mixed type behaviour. npHB0nBTCX pe3yJIbTaTbI UCCJIeHOBaAHl KOJIe6aTeJIbHbIX CIIeKTpOB CuGaS,, CuGaSe, U TBepHbIx PaCTBOpOB CuGaS,,Se,~, -, ) C IIOMOI4bIO CIEKTpOB klK OTpaweHun U KOM6UHalPiOHHOTO pa~XE&iR CBWa. kI3yWH XapaKTep KOHIIeHTpaWfOHHO% lIepeCrpO%KU KOJIe6aTeJIbHbIX IIOJIOC B CuGaS,,Se, (1 -,J. TBepAbIe PaCTBOpbI IIpOBBJIRIOT CMerUaHHhdi XapaKTep IIOBeAeHHR.

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