Infrared phonons ofZrS3−xSex

Infrared transmission spectra of the pseudo-one-dimensional Zr${\mathrm{S}}_3$-Zr${\mathrm{Se}}_3$ solid solutions are reported. A mixed- (one-, two-, and three-) mode behavior is observed and a correspondence with the Raman phonons is established. It is shown that the conjugate-pair Raman and infrared phonons have the same type evolution in the mixed samples. It is also observed that the one-dimensional character is more important in Zr${\mathrm{S}}_3$ than in Zr${\mathrm{Se}}_3$.