A study of rhodium iron and molybdenum iron alloys using the Mossbauer effect

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Abstract
The mossbauer spectra of 57Fe in rhodium iron (1-25%) and some molybdenum iron alloys have been obtained at 300 K, 4.2 K and 1.4 K, and the magnetic ordering temperatures have been observed as a function of iron concentration. The 300 K and the 4.2 K results show that the iron impurities are well screened, and from the low temperature results the saturation hyperfine fields for iron in rhodium (176+or-3 kOe) and iron in molybdenum (116+or-5 kOe) have been obtained. The behaviour of the spectra of dilute samples in an applied field of 29 kOe at 4.2 K and 1.4 K have been interpreted using these saturation hyperfine fields to obtain distribution curves of effective moment. Effects attributable to interactions between moments, and to the Kondo effect have been observed. The plot of ordering temperature against concentration for iron in rhodium appears not to pass through the origin, presumably due to the compensation of the magnetic moment.