X-ray photon correlation spectroscopy of structural fluctuations in relaxor ferroelectrics PZN-9%PT

Abstract

We have performed an x-ray photon correlation spectroscopy measurement of 91%Pb(Zn1/3Nb2/3)O3-9%PbTiO3 and found a slow structural fluctuation in time near TC. The slow fluctuation consists of long-term and short-term fluctuations. We have derived the short-term fluctuation from the intensity fluctuations and found out the relaxation time to be an order of 10 s. It is suggested that the slow fluctuation is owing to the competition between macroscopic tetragonal symmetry and the microscopic orthorhombic symmetry. The competition should be a main reason for the low-frequency dielectric permittivity. ©2011 Published under licence by IOP Publishing Ltd.