Far infrared transmission and structure of PbGeS semiconducting glasses |
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Authors: | KL Bhatia SC Katyal S Venugopalan |
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Institution: | Department of Physics, Maharshi Dayanand University, Rohtak, India;Raman Research Institute, Bangalore, India |
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Abstract: | Lead sulfide has been found to form stable glasses with GeS2 in the presence of GeS. Far-infrared transmission spectra of the glassy compositions x = 0.46, 0.23 and 0.115 in the pseudoternary (PbS)x (GeS2)0.70?x (GeS)0.30 and of the stoichiometric crystalline composition Pb2GeS4 have been observed for the first time. The results indicate a two optical mode behaviour of the compounds. The presence of the heavy lead atom in the GeS network seems to appreciably affect the bond bending modes of the GeS4 molecular unit without significantly disturbing its bond stretching vibrations. The presence of S3GeGeS3 molecular units in the amorphous compositions and their absence in Pb2GeS4 are indicated. |
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