Abstract
Mixed hydroxide, 3Er(OH) 3+5Fe(OH) 3, was prepared by chemical coprecipitation. X-Ray diffraction showed that the samples obtained by heating the mixed hydroxide at 650°C were amorphous, and contained Er 2O 3, α-Fe 2O 3, ErFeO 3 and Er 3Fe 5O 12 (ErIG) at 750°C. The changes in phase composition of the samples were also monitored by FT-IR spectroscopy. The Mössbauer spectrum of mixed hydroxide, 3Er(OH) 3+5Fe(OH) 3, at RT was characterized with a quadrupole doublet ( δ Fe=0.38, Δ=0.80, and Γ=0.50 mms −1). After heating the starting material up to 650°C, the superposition of two quadrupole doublets and of a sextet of very small intensity with H=506 kOe was observed. This result indicated that the amorphous fraction, as detected by XRD, actually contained additional Fe-bearing oxide phase of very fine particles and probably of poor crystallinity. The sample obtained at 1300°C was characterized by two hyperfine magnetic fields at RT with H d=394 and H a=489 kOe corresponding to ErIG. The results of magnetometric measurements of selected samples were discussed.
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