Abstract
Neutron powder diffraction of particulates of 0.7BiFeO 3–0.3PbTiO 3 in the tetragonal P4mm phase has been used to determine the type of antiferromagnetic order that occurs below 220 K. It is shown that G-type antiferromagnetic ordering occurs, with magnetic propagation along the 1 2 1 2 1 2 direction. Unlike the rhombohedral R3c phase the direction of antiferromagnetic propagation and the ferroelectric order parameter are not parallel in the tetragonal phase, but at an angle of 49.9°. The ground state (at 4 K) magnetic moment is 4.1 μ B.
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