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- W2028233786 abstract "The influence of stoichiometry, i.e., Ba/Ti ratio, on the microstructure and positive temperature coefficient of resistivity (PTCR) characteristics of BaTiO3 was investigated. Fine-grain microstructures are obtained for Ba-rich, stoichiometric, low-temperature-sintered, Ti-rich materials. The room-temperature resistivities (ρRT) of the fine-grain Ti-rich samples are large (>108Ω·cm). Excess Ba2+ ions can decrease the ρRT, by more than 2 orders of magnitude, because of the compensation of barium vacancies near the grain-boundary regions. Rapid cooling after sintering can also decrease ρRT (⋍100×) and is ascribed to the suppression of reoxidation. Large-grain microstructures and low ρRT, on the other hand, are generally observed for Ti-rich and Al2O3-SiO2-TiO2-added samples after sintering at a temperature higher than the corresponding eutectic point." @default.
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- W2028233786 date "1990-03-01" @default.
- W2028233786 modified "2023-09-27" @default.
- W2028233786 title "Influence of Stoichiometry on the Microstructure and Positive Temperature Coefficient of Resistivity of Semiconducting Barium Titanate Ceramics" @default.
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- W2028233786 doi "https://doi.org/10.1111/j.1151-2916.1990.tb06549.x" @default.
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