Simultaneous changes of nuclear and magnetic structures across the morphotropic phase boundary in (1 -x)BiFe0_3-xPbTi0_3

摘要

We present here the results of a powder neutron diffraction study on the (1-x)BiFeO_3-xPbTiO_3 (BF-xPT) system, which reveal an abrupt change in magnetic structure from a noncollinear antiferromagnetic one to a collinear G-type antiferromagnetic as the nuclear structure of the ferroelectric phase changes from monoclinic in Cc space group for x ≤ 0.27 to tetragonal in P4mm space group for x ≥ 0.31 across the morphotropic phase boundary (MPB). This reflects the multiferroic character of the MPB in the BF-xPT system.