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A calculation is presented on the evolution of longitudinal and transverse optical phonons as a function of the concentration parameter x in the system Zn x Cd 1-x Se. The calculation is based in an isodisplacement model of the atoms which include interactions to first and second neighbors. The model is fitted to Raman measurements carried out on thin-film samples grown by Close Spaced Vapor Transport (CSVT). Comparison to the experimental data allows to conclude that the x-dependence of these optical modes corresponds to an intermediate-mode behavior.