Single crystal raman studies of pyrite-type RuS2, RuSe2, OsS2, OsSe2, PtP2, and PtAs2

✍ Scribed by B. Müller; H. D. Lutz

• Book ID: 104661578
• Publisher: Springer-Verlag
• Year: 1991
• Tongue: English
• Weight: 315 KB
• Volume: 17
• Category: Article
• ISSN: 0342-1791
• DOI: 10.1007/bf00202242

✦ Synopsis

Single crystal Raman spectra of pyrite-type RuS2, RuS%, OsS2, OsSe2, PtP2, and PtAs2 are presented and discussed with reference to the energies of the X-X stretching modes Vx-x (Ag, Fg) and the X2 librations Rx2 (Eg, 2Fg). The main results obtained are (i) strong Raman resonance effects, (ii) different sequences for Vx_ x (Ag) and Rx~ (Eg), i.e., Vx-x>Rx~ for PtP2 and PtAs2 and Vx-x<Rx~ for OsS2, owing to the interplay of intraionic and interionic lattice forces, (iii) greater strengths for the intraionic P-P and As -As bonds compared to the S-S and Se-Se bonds, respectively, and (iv) a strong influence of the metal ions on the strength of the X-X bonds.