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Results of Mossbauer measurements on the intermetallic compounds (Fe1-xCox)2B(0

The effect of aluminium addition on the magnetic moments of the constituent atoms of binary BCC Fe-Co, Fe-Cr and FCC Ni-Fe alloys was investigated by comparing the results of Mossbauer and average magnetization measurements. It was found that the Al neighbours do not perturb the moment of Fe atoms in the Fe-Co and Ni-Fe alloys whereas there is a decrease in the Co and Ni moments. This different behaviour of Fe, Co and Ni towards the Al diluent is explained in terms of a simple local model. The simple model does not, however, explain the effects produced by Al in the BCC Fe-Cr alloys.

Measurements are presented of the nuclear resonance frequency of 59Co in (Fe1-xCox)2B ferromagnetic borides at 4.2K for 0.1

Paramagnetic susceptibility, high field magnetization and Mossbauer measurements are reported for the BexFe1-x intermetallic compounds (x=0.671 to 0.774) which have the Be2Fe crystal structure, the excess Be atoms occupy the Fe sites. The data show a rather strong decrease in the iron magnetic moments for the Be substitution which is localized around the excess Be atoms and it is attributed to the decrease in the magnetic splitting of the iron 3d bands while the electron density at the iron sites remains substantially unchanged.

For original paper see ibid., vol.13, p.183 (1983). It is shown that, contrary to the supposition of Takacs and Hargitai, there is no conclusive experimental evidence for a substantially reduced atomic magnetic moment in amorphous iron.

Results of Mossbauer measurements on dilute Fe based alloys with all soluble transition impurities are given; the spectra are analysed to obtain hyperfine field and isomer shift changes at first, second and average further neighbour shells. The hyperfine field changes are shown to be consistent with a model in which the conduction electron polarization has a linear response to the d moment changes induced by the impurity. The isomer shift changes are ascribed primarily to variations in the d spin up density at the Fe neighbour sites.