Crystallographic studies of some mixed thiogallate semiconductors

Kshirsagar, S. T. ; Sinha, A. P. B. (1977) Crystallographic studies of some mixed thiogallate semiconductors Journal of Materials Science, 12 (12). pp. 2441-2446. ISSN 0022-2461

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A crystallographic study has been made of solid solutions of the tetragonal defect chalcopyrites (14), CdGa2S4 and CdGa2Se4. The compositions may be represented by CdGa2S4(1-x)Se4x where x=0.0, 0.25, 0.50, 0.75 and 1.0. A complete solid solubility was observed between these two compounds. The a-axis values varied linearly with composition, whilstc-axis values initially showed a slower rise for x<0.5 and then a marked rapid rise with increasing selenium content. Single crystals were grown of these compositions by the chemical transport method. Optimum conditions required for the growth of the crystals have been established. The crystals of CdGa2S4 and CdGa2S3Se had the biggest face parallel to (001) plane whereas crystals of compounds CdGa2S2Se2, CdGa2SSe3 and CdGa2Se4 were triangular prisms with a face parallel to (112) plane and lang110rang as the growth axis. The parameters x, y andz for selenium position in CdGa2Se4 were obtained by comparing the calculated values of F2 factors with those obtained from observed intensities. The best match was found forx=y=0.25 andz=0.15.

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