The Raman scattering in a II-VI quaternary compound (Cd 1-x-y Zn x Mn y Te) exhibits zone-center optical phonons whose frequencies vary with composition in a manner amenable to an extension of the modified random-element isodisplacement model. As a member of diluted magnetic semiconductors, Cd 1-x-y Zn x Mn y Te exhibits the characteristic large magnetic-field-dependent redshift of the excitonic photoluminescence, the Raman-electron paramagnetic resonance of Mn 2+ , and an evidence of the Raman-antiferromagnetic resonance