Abstract
A powder neutron diffraction study was carried out on 0.8BiFeO3-0.2PbTiO3 in the temperature range 27–1000°C. The system exhibits magnetic transition at ∼300°C and a rhombohedral (R3c)-cubic (Pm3m) ferroelectric phase transition at ∼650°C. Anomalous variation in the lattice parameters and the octahedral tilt angle is observed across the magnetic transition temperature. In the magnetic phase, the c parameter is contracted and the octahedral tilt angle is slightly increased. The results suggest coupling between the spin, lattice and structural degrees of freedom.
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