CRYSTAL-GROWTH AND CHARACTERIZATION OF THE SOLID-SOLUTION (ZNSE)(1-X)(CUMSE(2))(2) (M=AL, GA, OR IN)

Single crystals of (ZnSe)(1-x)(CuMSe(2))(x) (M=Al, Ga, or In) were gro wn by chemical vapor transport technique. Powdered polycrystalline sam ples of (ZnSe)(1-x)(CuMSe(2))(x) (M=Al, Ga, or In) were also prepared by the direct combination of the elements. The chemical composition of these single crystals was determined by comparing their lattice param eters with those of the standard polycrystalline samples. The IR trans mission range of single crystals of (ZnSe)(1-x)(CuMSe(2))(x) (M=Al, Ga , or In) is sightly narrower than that observed for pure ZnSe. However , these materials still show good transmission in the long-wavelength IR range. The addition of small amounts of CuMSe(2) (M=Al, Ga, or In) considerably increases the hardness of ZnSe.