Copper(II)-doped Pb[Zr0.54Ti0.46]O-3 (PZT) ferroelectrics with a dopant
concentration of 0.25 mol% were investigated at high magnetic fields,
enabling an enhanced resolution of the structural distortion at the
dopant site. The results obtained suggest that Cu2+ stop substitutes as
an acceptor centre for [Zr,Ti](4+) in oxygen octahedra with tetragonal,
monoclinic and rhombohedral distortion, confirming the model of
mesoscopic mixing at the morphotropic phase boundary.