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Sol–gel combustion synthesis of BNBT powders

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Abstract

Ba-modified bismuth sodium titanate with composition 0.94[(Bi0.5Na0.5)TiO3]-0.06BaTiO3 (BNBT) was prepared by a citrate nitrate sol–gel combustion method. The sol was obtained using barium acetate, bismuth nitrate, sodium nitrate and a peroxo-citrate complex of titanium isopropoxide as starting precursors. Various molar ratios of citrate/nitrate (C/N) were considered for the sol production. The corresponding gels were fired at different temperatures (300, 400, 500 °C) in order to evaluate the conditions necessary to obtain the decomposition of the precursors and the formation of the pure BNBT perovskitic phase in a single step. The best conditions to obtain the desired phase are: (C/N) = 0.2, and combustion temperature of 500 °C. Ball milled powders were densified at a temperature 100 °C lower than the one generally used for powder produced with the conventional mixed oxide route. The electrical properties are comparable to those reported for conventionally prepared materials.

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Authors and Affiliations

  1. CNR-ISTEC, Institute of Science and Technology for Ceramics, National Research Council, via Granarolo 64, Faenza, Italy

    Elisa Mercadelli, Carmen Galassi, Anna Luisa Costa, Stefania Albonetti & Alessandra Sanson

  2. Department of Industrial Chemistry and Materials, Bologna University, Viale Risorgimento 4, Bologna, 40126, Italy

    Elisa Mercadelli & Stefania Albonetti

Authors
  1. Elisa Mercadelli
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  2. Carmen Galassi
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  3. Anna Luisa Costa
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  4. Stefania Albonetti
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  5. Alessandra Sanson
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Correspondence to Carmen Galassi.

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Mercadelli, E., Galassi, C., Costa, A.L. et al. Sol–gel combustion synthesis of BNBT powders. J Sol-Gel Sci Technol 46, 39–45 (2008). https://doi.org/10.1007/s10971-008-1693-4

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  • DOI: https://doi.org/10.1007/s10971-008-1693-4

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