||Anomalous thermal hysteresis of two first order phase transitions in relaxor ferroelectric 0.945 Pb(Zn1/3Nb2/3)O3-0.055PbTiO3 crystals studied by Brillouin scattering
Islam, Md. Saidul ,
Tsukada, ShinyaKojima, Seiji
Journal of applied physics
, p.094106 , 2016-03 , American Institute of Physics
The thermal hysteresis has been studied by Brillouin scattering in the relaxor ferroelectric (1 − x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 with x = 0.055 (i.e., below the morphotropic phase boundary composition x ∼ 0.08). On heating from room temperature, the first order rhombohedral to tetragonal phase transition occurs at TR-T = 397 K, then the first order tetragonal to cubic transition occurs at TT-C = 425 K. However, on cooling from high temperature, only the diffusive phase transition was observed around TC-R = 401 K. Such anomalous thermal hysteresis is attributed to the metastable non-equilibrium states induced by supercooling due to quenching of nano-domains by the random electric fields of the B-site charge disorder.