Heat capacity and thermal expansion study of relaxor-ferroelectric Ba_0.92Ca_0.08Ti_0.76Zr_0.24O₃

Abstract

Heat capacity and thermal expansion of the Ba0.92Ca0.08Ti0.76Zr0.24O3 compound is measured using the methods of adiabatic calorimetry and optic-mechanical dilatometry in the temperature range 100–370 K. Three blurred anomalies on the Cp(T) and α(T) dependencies are observed in the temperature range 200–360 K. The results of the studies are discussed together with data on the structure and dielectric properties in the framework of spherical random bond–random field model.