Current‐limiting action of mixed‐phase BaTiO3ceramic semiconductors
作者:
V. Ravi,
T. R. N. Kutty,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 68,
issue 9
页码: 4891-4893
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.347161
出版商: AIP
数据来源: AIP
摘要:
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,BaZrO3, 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.
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