Abstract
Layered SrBi2(Nb1−x V x )2O9 (SBVN) ceramics with x ranging from 0 to 0.3 (30 mol%) were fabricated via the conventional sintering technique. A remarkable transformation in the microstructure of SBN ceramic was encountered as the V2O5 content increased from 3–30 mol%. The average grain size of the SBN ceramic containing V2O5 was found to increase with increase in V2O5 content. The dielectric constant (ϵ r ) as well as the dielectric loss (D) increased with increase in grain size (6 μm–17 μm). The ferroelectric to paraelectric transition temperature (T c ) shifted to higher temperature with increasing grain size. The pyroelectric coefficient was positive at 300 K and increased with increasing grain size. Interestingly, the SrBi2(Nb0.7V0.3)2O9 (x = 0.3) ceramics with a grain size of 17 μm exhibited higher remnant polarization (P r ) and lower coercive field (E c ) than those with grains of 7 μm. The Curie-Weiss constant that was obtained for these ceramics was in line with that of displacive type ferroelectrics.
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