Mossbauer study of Eu_1-xGd_xFeO₃

Europium gadolinium ferrites Eu_1-xGd_xFeO₃ (x=0, 0.2, 0.4, 0.6 and 0.8) were synthesized under constant pressure, high temperature and high pressure, high temperature respectively. A Rigaku X ray diffractometer with copper rotating target was used to analyse the structures of these compounds, and the results show that all compounds possess a perovskite structure. Both the ¹⁵¹Eu and ⁵⁷Fe Mossbauer spectra were measured using OXFORD MS-500 Mossbauer spectrometer. For ¹⁵¹Eu the pure quadrupole spectra are obtained, meanwhile both ismer shift and quadrupole splitting vary with x. The hyperfine field of the ⁵⁷Fe Mossbauer spectrum depends linearly on the unit-cell volume. The ⁵⁷Fe spectra of the samples synthesized under high temperature and high pressure, show a partial paramagnetic structure.