Enhanced mechanical and ferroelectric properties through Grain size refinement in site specific substituted lead free Na0.5-xKxBi0.5TiO3 (x = 0 – 0.10) ceramics

Karthik, T and Asthana, Saket (2017) Enhanced mechanical and ferroelectric properties through Grain size refinement in site specific substituted lead free Na0.5-xKxBi0.5TiO3 (x = 0 – 0.10) ceramics. Materials Letters, 190. pp. 273-275. ISSN 0167-577X

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Abstract

Site specific substitution of K-ion at Na-site (i.e., Na0.5-xKxBi0.5TiO3-NKBT) by varying its concentration from x = 0 – 10 mol% decreased the grain size significantly from 14 μm (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., 63 kV/cm (x = 0) to 36 kV/cm (x = 10). Vickers hardness also displayed strong grain size dependence and attained a maximum of 10.2 GPa 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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