Abstract
The lattice vibrations in Cd x Zn 1- x Cr 2 Se 4 crystals have been studied by measuring the reflection at normal incidence in the region of wave number above 30 cm -1 . Four reststrahlen bands were observed over all composition range, and the positions and the intensities of these bands vary with the composition. The behaviours of these variations show a characteristic of one-mode type. The transverse mode frequencies are calculated from the classical dispersion theory. The composition dependences of those transverse mode frequencies can be explained with a virtual crystal model which includes two kinds of units: a mass and force constants are varied monotonically with the fractional amount of Cd ion in the mixed crystal. The frequencies of the longitudinal modes are also calculated. The condition for the appearance of the one-mode or two-mode type is shortly discussed.
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