Far Infrared and Raman Spectra in (As2S3)1-x(Sb2S3)x Glasses

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Abstract
The far infrared reflection and Raman spectra of (As2S3)1-x (Sb2S3) x glasses (0≤x≤0.6) were measured in the spectral region 60∼600 cm-1 at room temperature. Two-mode type behaviors of the dominant modes originating from the local vibrations of AsS3 and SbS3 pyramidal units were observed. The infrared and Raman dominant mode frequencies of g-Sb2S3 are 270 cm-1 and 297 cm-1, respectively. The optical constants were calculated by Kramers-Kronig analysis, and were also analyzed by the classical oscillators model. The effective charges of the AsS3 and SbS3 pyramidal units were calculated. The force constants were calculated using Gordy's model, Somayajulu's model and also by the general valence force field method. The dependence of the infrared and Raman dominant modes on the composition x shows that hetero-bondings (chemical ordering) and therefore pyramidal units are predominant in this system.