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 |
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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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