RAMAN-SPECTRA OF THE MIXED-CRYSTALS RUSXSE2-X

Abstract

The Raman spectra of the mixed RuSxSe2-x crystal systems have been measured for the first time. As the composition parameter x becomes 1.8 and 0.6, both the E(g) and the A(g) modes of pure crystals merge into the RuS2-like and the RuSe2-like-modes, respectively, in the mixed pyrite. The broadenings and shifts are significant for x range between 0.6 and 1.8. These unique features are different from the so called "one-mode" and "two-mode" behaviours of some II-VI, III-V compound alloys. Our results are interpreted in terms of the spatial correlation model.