Abstract
Hyperfine interactions of iron — yttrium oxide systems have been investigated by Mossbauer spectroscopy and magnetic measurements. The mixed oxides having varying ratios were prepared by heating the coprecipitated oxyhydroxides to about 1000°C in air. The room temperature Mossbauer spectra are complex in nature and some of them exhibit as may as 10 well resolved peaks consisting of two sets of magnetically split hyperfine six line patterns, indicating existence of two different environments around Fe. The values of specific magnetic susceptibility change with increasing amount of yttrium is maximum for 1:1 (Y:Fe) and then falls continuously. The observed Hn values are less than the reported values for α-Fe2O3. From the observed data it appears that a transition for the composition of 1:1 definitely takes place and probably two species are formed. Some of the mixed oxides behave like iron filings in a magnetic field.
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