Abstract
Neutron diffraction data were collected from sintered polycrystalline 0.9BiFeO3–0.1PbTiO3 at temperatures between 293 and 793 K and the crystal and magnetic structures refined by the Rietveld method. An antiferromagnetic Néel temperature of 592 K was determined from a Brillouin fit to the refined magnetic moments with a ground state of 4.34μB, showing no loss of moment per Fe site compared to BiFeO3. Some magnetic order was observed to persist above the Néel temperature. A maximum in the spontaneous rhombohedral strain was observed close to the Néel temperature, in a significant departure from typical Landau behavior for a ferroelectric and suggesting a coupling between the magnetic and nuclear structures.
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