Karthik, C and Varma, KBR (2006) Influence of vanadium doping on the processing temperature and dielectric properties of barium bismuth niobate ceramics. In: Materials Science and Engineering: B, 129 (1-3). pp. 245-250.
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Abstract
Barium bismuth vanadium niobate, $BaBi_2(Nb_1_-_xV_x)_2O_9 (0 \leq x \leq 0.1)$ ceramics were fabricated from the powders prepared via solid state reaction route. The single phase layered perovskite structure was preserved up to 5 at% (x = 0.05) of vanadium. The addition of $V_2O_5$ substantially improved the sinterability associated with high density (96%) which was otherwise difficult in the case of pure $BaBi_2Nb_2O_9$ (BBN). The sintering temperature was significantly reduced from 1100 to 900 °C. The scanning electron microscopic (SEM) studies revealed the transformation of a porous microstructure to a well-packed platy grained with negligible inter-granular porosity. The dielectric constant of BBN ceramics at both room temperature and in the vicinity of the temperature of dielectric maximum $(T_m)$ has increased significantly with increase in vanadium content and the loss remained almost constant. The$T_m$ increased with increase in $V_2O_5$. For instance, there was an upward shift of about 25 °C in $T_m$ for 5 at% (x = 0.05) vanadium-doped BBN. Interestingly, the diffuseness $(\gamma)$ in the phase transition was found to decrease with increase in vanadium doping level.
Item Type: | Journal Article |
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Publication: | Materials Science and Engineering: B |
Publisher: | Elsevier |
Additional Information: | Copyright of this article belongs to Elsevier. |
Keywords: | Aurivillius oxides;Doping effects;Sintering;Vanadium;Relaxor ferroelectrics |
Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
Date Deposited: | 16 May 2006 |
Last Modified: | 19 Sep 2010 04:26 |
URI: | http://eprints.iisc.ac.in/id/eprint/6684 |
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