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PACS 75.50.Cc An extension of a mean-field approximation (MFA) developed within standard basis operators (SBO) is used to study magnetism in magnetic -nonmagnetic binary alloys. The Curie temperature is calculated from the free energy within the framework of the present approach. The calculated results are in fair agreement with the theoretical results of other research groups for the same problem but utilizing other methods. Finally, the case of NiPt alloys is briefly examined as an example test for the comparison with experiment.