Synthesis and Characterisation of 0.45Ba(Zr0.2Ti0.8) O3-0.55(Ba0.7Ca0.3) TiO3 (BZT-BCT) Lead Free

Abstract

The lead free polycrystalline ferroelectric samples of 0.45Ba(Zr0.2Ti0.8) O3-0.55(Ba0.7 Ca0.3)TiO3 have been synthesized using auto combustion technique. The room temperature XRD pattern reveals the formation of single phase compound. The sample shows a saturated ferroelectric behaviour for both poled and unpoled case. From P-E hysteresis loop, the remnant polarisation (2Pr0) and coercive field (Ec0) are found to be 5.39μC/cm2, 4.672 kV/cm (poled sample ) and 3.44 μC/cm2, 3.893 kV/cm (unpoled sample ) respectively. The I-V characteristic shows a symmetric behaviour for both positive and negative applied electric field. The temperature dependent dielectric measurement for both poled and unpoled sample has been carried out. The temperature dependent dielectric properties shows a high dielectric constant (ɛr) value of 5880 around Tc =950C (for poled) and 5869 around Tc =890C ( for unpoled) sample.