Current-limiting action of mixed-phase $BaTiO_3$ ceramic semiconductors

Ravi, V and Kutty, TRN (1990) Current-limiting action of mixed-phase $BaTiO_3$ ceramic semiconductors. In: Journal of Applied Physics, 68 (9). pp. 4891-4893.

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Abstract

Stable and highly reproducible current-limiting characteristics are observed for polycrystalline ceramics prepared by sintering mixtures of coarse-grained, donor-doped $BaTiO_3$ (tetragonal) as the major phase and ultrafine, undoped cubic perovskite such as $BaSnO_3 , BaZrO_3, SrTiO_3, or BaTiO_3$ (cubic). The linear current-voltage (I-V) relation changes over to current limiting as the field strength increases, when thermal equilibrium is attained. The grain-boundary layers with low donor and high Sn, Zr, or Sr have depleted charge carrier density as compared to that in the grain bulk. The voltage drop at the grain-boundary layers diminishes the temperature gradient between the interior and surface regions.

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics
Keywords:	ceramic semiconductors
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	03 Jan 2008
Last Modified:	19 Sep 2010 04:41
URI:	http://eprints.iisc.ac.in/id/eprint/12605

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