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Current‐limiting action of mixed‐phase BaTiO3 ceramic semiconductors

Ravi, V and Kutty, TRN (1990) Current‐limiting action of mixed‐phase BaTiO3 ceramic semiconductors. In: Journal of Applied Physics, 68 (9). pp. 4891-4893.

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Stable and highly reproducible current‐limiting characteristics are observed for polycrystalline ceramics prepared by sintering mixtures of coarse‐grained, donor‐doped BaTiO3 (tetragonal) as the major phase and ultrafine, undoped cubic perovskite such as BaSnO3, BaZrO 3, SrTiO3, or BaTiO3 (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.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 03 Jan 2012 09:27
Last Modified: 03 Jan 2012 09:27
URI: http://eprints.iisc.ac.in/id/eprint/42999

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