Investigation of orthorhombic-to-tetragonal structural phase transition in(Ba1-xCax)(Zr0.05Ti0.95)O3 ferroelectric ceramics using micro-Raman scattering
ABSTRACT Ferroelectric phase transition from orthorhombic-to-tetragonal phase was investigated in (Ba1-xCax)(Zr0.05Ti0.95)O3 ceramics [x=0.05, 0.08, 0.10] by micro-Raman scattering. The room temperature Raman scattering reveals the presence of orthorhombic-tetragonal phase co-existence by emergence of tetragonal phase with increase in calcium content. The temperature dependent Raman spectra also show similar cross-over with hardening of A(TO2) mode and disappearance of A(LO1) mode as system moves from orthorhombic-to-tetragonal phase. A thermal hysteresis of ~10K was observed in orthorhombic-to-tetragonal transition.