Phase transition behavior of BaZrxTi1?xO3 ceramics

BaZrxTi1−xO3 ceramics were prepared for x = 0, 0.05, 0.08, 0.15 and 0.20 using a solid-state reaction technique. The evolution of the Raman spectra with temperature was used to study the variation of the basic phase transition temperatures of BaTiO3 in these compositions. The tetragonal to cubic transition temperature on heating was found to decrease with increasing Zr content. The orthorhombic to tetragonal transition temperature, which increases with initial increase in Zr content, merges with the tetragonal to cubic transition for x ≥ 0.15 compositions. These Raman results are in excellent agreement with those obtained from dielectric measurements.