Polar vibrational modes in Ag3AsS3 crystals

✍ Scribed by N.N. Syrbu; V.Z. Cebotari; M. Bogdanash

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 381 KB
• Volume: 52
• Category: Article
• ISSN: 1386-1425
• DOI: 10.1016/0584-8539(96)01677-7

✦ Synopsis

Reflectivity spectra of Ag3AsS 3 crystals have been investigated in the range from 50 to 4000 cm i for E]lc and E Lc polarizations, and practically all expected vibrational modes of A 1 and E symmetry have been found. Phonon parameters, i.e. frequencies of LO and TO modes, longitudinal-transverse splitting and deilectric constants e~ and go are determined. Effective ionic charges of Ag, As and S ions and their anisotropy are estimated.