Abstract
The Raman scattering technique was used to follow the optical phonons in mechanical alloyed Zn 50Se 50 mixture. The as-milled Zn 50Se 50, the aged and heat treated Zn 50Se 50 samples were examined to evaluate the influence of the processing method and aging effects on their vibrational properties. The most important changes in the Raman parameters of the Se n chain phonons of non-reacted Se phase and the longitudinal and transversal optical phonons (LO and TO) of the ZnSe phase with aging were associated with the growing of the crystalline Se phase and with both stress rising and the reduction of the bonds effective-charge of the ZnSe phase. The thermal treatment of the aged Zn 50Se 50 sample induced the separation of the non-reacted Se and an improvement in the cristallinity of the ZnSe phase, which recovered its Raman parameters. In addition, it was also seen a huge increase of TO phonon intensity.
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