Abstract
The Mossbauer spectra of Y3Al x Cr X Fe5 − 2x O12 (x = 0.0 to 0.6) measured at 300 K have been fitted with two sextets in the ferrimagnetic state corresponding to Fe3+ at the octahedral (a) and the tetrahedral (d) sites for x ≤ 0.6. The isomer shifts (δ) and quadrupole splitting (ΔEQ) indicate the presence of high spin Fe3+ ions in the tetrahedral (d) and octahedral (a) sites, typical of yttrium of yttrium iron garnet structure. Mossbauer results have shown that Al3+, enters a-sites only but Cr3+ enters both a-and d-sites.
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