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Vibrational properties and network topology of amorphous AsS systems

1984; Elsevier BV; Volume: 65; Issue: 2-3 Linguagem: Inglês

10.1016/0022-3093(84)90052-8

1873-4812

Tatsuo Mori, Kiyoto Matsuishi, Toshihiro Arai,

Glass properties and applications

We have measured the Raman scattering and the infrared absorption and reflection spectra of a-AsxS1−x (0.1≤x≤0.4) systems and have calculated the vibrational frequencies at the center of Brillouin zone and the intensity of the oscillator strengths of the stretching modes of crystalline As2S3. These results indicate that the IR and Raman modes in a-AsS systems are originated in the AsS network rather than in a pyramidal unit. The calculations of the vibrational frequencies in the S8 ring molecule and the rigid-layer modes of crystalline As2S3 show that the long range interactions between the non-bonded atoms are weak but important.