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Far infrared transmission and structure of PbGeS semiconducting glasses

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
31
Issue
3
Identifiers
DOI: 10.1016/0022-3093(79)90145-5
Disciplines
  • Physics

Abstract

Abstract Lead sulfide has been found to form stable glasses with GeS 2 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 (GeS 2) 0.70− x (GeS) 0.30 and of the stoichiometric crystalline composition Pb 2GeS 4 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 GeS network seems to appreciably affect the bond bending modes of the GeS 4 molecular unit without significantly disturbing its bond stretching vibrations. The presence of S 3GeGeS 3 molecular units in the amorphous compositions and their absence in Pb 2GeS 4 are indicated.

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