SYNTHESIS OF CUGAS2 BY MEANS OF HOMOGENEO US PRECIPITATION REACTION AND APPLICATION FOR PHOTOLUMINESCENCE

Powdery CuGaS2 has been synthesized by the homogeneous precipitation i n an aqueous solution containing prescribed amounts of Cu2+, Ga3+, S2O 3(2-) and acetic acid at 85-degrees-C for 1h followed by thermal treat ment at 800-degrees-C for 1h and then immersing in 10% KCN solution fo r 300s. The analytical values for the sample thus obtained are Cu 1.01 : Ga 1.00 : S 2.05 in fair agreement with stoichiometric ratio. The f inal product with bright yellow in color was obtained in 71% yield. By use of this product, it is possible to grow the single crystal for th e use in optical devices by chemical transport. As-grown crystal of ch alcopyrite with well developed (112) plane showed the sharp photolumin escence in green and red zones under laser beam excitation.