Abstract
The morphotropic composition of lead zirconate titanate sPZTd, PbZr0.52Ti0.48O3, was studied as a function of temperature s47–310 Kd and hydrostatic pressure sfrom 0.1 MPa to 7.6 GPad by neutron powder diffraction. Series of monoclinic sspace groups Cm and Ccd and triclinic phases sspace groups F1 and F1¯d were observed at various points in the P-T phase diagram of PbZr0.52Ti0.48O3. The high-pressure behavior is characterized by two mechanisms, a rotation and reduction of the spontaneous polarization and the onset of octahedral tilting leading to unit cell doubling. The results show that pressure, as in the case of temperature and external electric fields, can induce polarization rotation.