Abstract
In order to study the local environment effect, measurements of the Mossbauer effect of Fe 57 were made for Ni 79.5 Fe 20.5 , Ni 75.4 Fe 24.6 and Ni 69.7 Fe 30.3 alloys with various degrees of long range order. We have analysed the Mossbauer pattern with 7 or 8 configurations without any assumption of the functional relation between the hyperfine field and the number of Fe atoms in the nearest neighbor shell and determined the value of the hyperfine field for each environment from which the values of the magnetic moment on Fe atoms could be deduced in a self-consistent way. The results show that the variations of the hyperfine field and the magnetic moment are not linear, especially for highly ordered alloys. This behavior is discussed in terms of the cluster CPA theory.
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