Abstract
Site specific substitution of K-ion at Na-site (i.e., Na0.5−xKxBi0.5TiO3-NKBT) by varying its concentration from x=0–10mol% decreased the grain size significantly from 14μm (x=0) to 1.1μm (x=10). The substituted K-ion acts as a grain growth inhibitor to attain fine grained ceramics. Coercive field (EC) showed a strong grain size dependence and observed a maximum softening of 43% in EC i.e., 63kV/cm (x=0) to 36kV/cm (x=10). Vickers hardness also displayed strong grain size dependence and attained a maximum of 10.2GPa for NKBT-10 ceramics, which is double than parent NBT and other commercial lead based piezo-ceramics such as PZT and PLZT.
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