Mössbauer Studies of BiFeO3-PbTiO3 Perovskite-Type Solid Solutions

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Abstract
The Mössbauer spectra of the ferroelectric solid solutions (BiFeO3)x(PbTiO3)1−x have been studied as a function of temperature, mainly between room temperature and 600°C, using 57Fe in the solutions as an absorber. The quadrupole splitting increased and the isomer shift decreased between x=0.05 and x=0.70, a range in which the solutions are tetragonal and paramagnetic, and in which the unit cell volume increases with increasing x. The isomer shift, in particular, was primarily determined by the unit cell volume. Data are presented on the internal magnetic field of the antiferromagnetic solutions in the rhombohedral phase between x=0.7 and x=1.0. The results demonstrate the similarity and continuity in internal structure between the ferroelectrics PbTiO3 and BiFeO3.