Abstract
The Mössbauer effect was used in a study of BiFeO 3 with an excess of Bi 2O 3, and of stoichiometric BiFeO 3PbZrO 3 solid solutions. Mössbauer spectra of BiFeO 3 were taken over the temperature range of 78–770°K. The internal field was found to follow a Brillouin curve of S = 5 2 with Neel temperature = 640 ± 5°K and H eff(0°K) = 555 ± 10 k-G. The quadrupole splitting shows irregular changes at 400 and 500°K, corresponding to crystallographic phase transitions; these results are supported by centershift measurements. Discrepancies with regard to quadrupole splitting above the Neel temperature are attributable to the presence of phases other than BiFeO 3. Measurements on (BiFeO 3) x , (PbZrO 3) 1− x systems over a range of compositions ( x = 0·2, 0·3, 0·4, 0·5) showed no magnetic ordering at room temperature down to 78°K, although it was reported for similar compositions of BiFeO 3PbTiO 3; this can be explained by changes in the conditions for exchange interaction in the FeOFe line. An increase of the QS of BiFeO 3PbZrO 3 with the mole percentage of BiFeO 3 was observed and interpreted in terms of the electric field gradient due to the induced dipole moment at the Fe +3 site; a correlation also exists between the cell volume and the QS increase with the mole percentage. By contrast, the center shift does not change significantly with the composition.
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