Behaviour of thermal expansion of (1-x)Pb(Ni^sub 1/3^Nb^sub 2/3^)O^sub 3^–xPbTiO^sub 3^ solid solutions

Received 26 April 2017, revised 8 July 2017, accepted 13 July 2017, available online 26 October 2017 © 2017 Authors. This is an Open Access article distributed under the terms and conditions of the Creative Commons AttributionNonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/). 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 the series of x = 0-0.8 in the temperature 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 and the data on deformation are used to estimate the Burns temperature and the mean square polarization of the samples found to decrease with the decrease of the PbTiO3 concentration.