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Effect of the crystallinity of BaTiO3 powders prepared using the merker method on the properties of PTCR ceramics

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Abstract

Barium titanate powders differing in particle size (110–740 nm) were prepared by calcining barium titanyl oxalate precipitated by the Merker method. The powders were sintered to produce PTCR ceramics with the composition 100(Ba0.89Ca0.08Pb0.03)TiO3 + 0.8TiO2 + 0.7Y + 0.1Mn + 2.5SiO2 and electrical properties of the ceramics were studied. The results demonstrate that improving the crystallinity of the barium titanate powder suppresses recrystallization of the ceramics and has a significant effect on their resistance ratio and electric strength. We found the optimal range of calcination temperatures (950–1000°C) for barium titanyl oxalate which ensures the highest electric strength of thermistors with a resistance of 31 Ω. The average crystallite size of the parent barium titanate powder is ∼250–320 nm.

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Authors and Affiliations

  1. Institute of Technical Acoustics, Belarussian Academy of Sciencest, pr. Lyudnikova 13, Vitebsk, 210023, Belarus

    V. N. Shut, S. V. Kostomarov & V. L. Trublovsky

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  1. V. N. Shut
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  2. S. V. Kostomarov
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  3. V. L. Trublovsky
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Correspondence to V. N. Shut.

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Original Russian Text © V.N. Shut, S.V. Kostomarov, V.L. Trublovsky, 2012, published in Neorganicheskie Materialy, 2012, Vol. 48, No. 6, pp. 746–752.

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Shut, V.N., Kostomarov, S.V. & Trublovsky, V.L. Effect of the crystallinity of BaTiO3 powders prepared using the merker method on the properties of PTCR ceramics. Inorg Mater 48, 648–654 (2012). https://doi.org/10.1134/S0020168512060179

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  • DOI: https://doi.org/10.1134/S0020168512060179

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