Abstract
BaBi2Ta2O9 (BBT) based ferroelectric glass-ceramics (GCs) with different zirconium oxide (ZrO2) content used as nucleating agent are synthesized via glass melt-quenching technique followed by temperature controlled crystallization. The effect of ZrO2 as a nucleating agent on the crystallization mechanism, microstructure and dielectric properties of BBT based GCs has been studied for the first time. Crystallization kinetics studies facilitated successful controlled crystallization of ZrO2 doped BBT based GCs around the exothermic peak temperature using double stage and single-stage heat-treatments, which was otherwise difficult in the undoped glass. The dielectric constant increased while the loss and dissipation factors decreased with increase in zirconia content in the GCs. The dielectric properties obtained from single-stage and double-stage heat-treated GCs have been compared and correlated to the corresponding microstructures of the GCs. With 5 mol % ZrO2, dielectric constant of 181 with loss of 0.04 has been obtained for the sample fabricated by single-stage ceramization around the 2nd crystallization peak temperature.
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