Behaviour of thermal expansion of (1-x)Pb(Ni1/3Nb2/3)O3 –xPbTiO3 solid solutions

Abstract

The features of the dependence of the bulk coefficient of thermal expansion of the (1-x) Pb(Ni1/3Nb2/3)O3-xPbTiO3 solid solution studied in series of x = 0 – 0.8 in the range from 100 to 750 K are reported. The obtained data and observed anomalies of thermal expansion are compared with dielectric properties, heat capacity and the phase diagram of concentration. The anomalous and lattice constituents of deformation and of the coefficient of thermal expansion are analysed the data on deformation being used to estimate the Burns’ temperature and the mean-square polarisation of the samples found to decrease with the decrease of PbTiO3 concentration.