Transition of a one-mode to a two-mode behavior in the quasi-one-dimensional and quasi-two-dimensional solid solutionsZrS3−xSex

Infrared reflectivity of the fibrous solid solution $\mathrm{Zr}{\mathrm{S}}_{3-x}{\mathrm{Se}}_x$ is studied. As predicted by the coherent-potential approximation and rescaling method, a switching from a one-mode-type to a two-mode-type phonon behavior is observed. Such behavior could also be the result of the transition from a quasi-one-dimensional to a quasi-two-dimensional system.