Variation of second-order Doppler (SOD) shift, recoil-free fraction (f), and hyperfine field (H) are studied for disordered Co49Fe51 and Ni48Fe52 alloys in the temperature range 4.2 to 1000 K. The SOD shift and f-factor are analysed in terms of the Debye approximation. The average reduced field for Ni48Fe52 is fitted to a modified Brillouin function. The average reduced field for Co49Fe51 alloy shows a kink around 823 K similar to magnetisation data.
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Chandra et al. (1976) studied this question.
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