The phase transition sequence in the relaxor ferroelectric PZN 8% PT

Crystal structures and phase transitions in the giant piezoelectric effect material lead zinc niobate-8% lead titanate (PZN-8% PT) between 4.2 and 455 K have been determined using very high resolution powder neutron diffraction. The structure at 4.2 K is monoclinic (Cm). On heating, the monoclinic phase transforms first into tetragonal (P4mm) and then cubic (Pm3m) structures via first-order transitions with wide two-phase regions.