# The Microstructural, Dielectric, Pyroelectric and Ferroelectric Properties of $SrBi_{2}(Nb_{1-x}V_{x})_{2}O_{9}(0 \leq x \leq 0.3)$ Ceramics

Venkataraman, Harihara B and Varma, KBR (2005) The Microstructural, Dielectric, Pyroelectric and Ferroelectric Properties of $SrBi_{2}(Nb_{1-x}V_{x})_{2}O_{9}(0 \leq x \leq 0.3)$ Ceramics. In: Ferroelectrics, 315 . pp. 45-60.

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## Abstract

Layered $SrBi_{2}(Nb_{1-x}V_{x})_{2}O_{9}$ (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 $V_{2}O_{5}$ content increased from 3-30 mol%. The average grain size of the SBN ceramic containing $V_{2}O_{5}$ was found to increase with increase in $V_{2}O_{5}$ content. The dielectric constant $(\epsilon_{r})$ as well as the dielectric loss (D) increased with increase in grain size(6 \mu m-17 \mu m). 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 $SrBi_{2}(Nb_{1-x}V_{x})_{2}O_{9}$(x = 0.3) ceramics with a grain size of 17 \mu m exhibited higher remnant polarization $(P_{r})$ and lower coercive field $(E_{c})$ than those with grains of 7 \mu m. The Curie-Weiss constant that was obtained for these ceramics was in line with that of displacive type ferroelectrics.

Item Type: Journal Article Copyright for this article belongs to Taylor & Francis Ltd. Division of Chemical Sciences > Materials Research Centre B.S Priyanka 18 Aug 2005 08 Feb 2012 05:19 http://eprints.iisc.ac.in/id/eprint/3527