Abstract
The temperature dependence of the magnetic hyperfine field of neodymium-iron mixed oxides has been studied by 57Fe Mössbauer spectroscopy. Mixed oxides of Nd and Fe in atomic ratios of 1:3, 1:2, 1:1, 2:1 and 3:1 were annealed at 850, 1000 and 1250°C. Mössbauer spectra were recorded between 4.2 and 300 K. For a sample of 1:1 composition (1000°C annealed) Mössbauer spectra were also recorded at high temperatures leading to t n ⋍ 660 K . The variation of internal magnetic field with temperature (1:1 composition, 1000°C) closely matches with that of NdFeO 3 (perovskite) phase. All samples of 1:1 composition show single six-line spectra, indicating one crystallographic site of iron ion. For iron-rich samples, the Mössbauer spectra showed two sextets which correspond to NdFeO 3 and α-Fe 2O 3 phases. These results agree with our X-ray and magnetic susceptibility studies.
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