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Fabrication of dense (Bi1/2K1/2)TiO3 ceramics using hydrothermally derived fine powders

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Abstract

(Bi1/2K1/2)TiO3 (BKT) powders were synthesized by a hydrothermal reaction using anatase TiO2 and Bi(OH)3 under a strong alkaline condition of [KOH] = 12 M. The reaction at 200 °C for 3 h provided a mixture of BKT and Ti-rich fibrous amorphous phases. The single-phase BKT powder with a particle size of 200 nm was successfully obtained by applying a two-step temperature profile for the reaction, which consists of temperature rising up to 160 °C and subsequent holing at 110 °C for 6 h. It was found that washing treatment of the hydrothermal BKT powder with deionized water caused leaching of K+ ions, resulting in the thermal decomposition of the powder during high-temperature heat treatment. It was a key to use ethanol for the washing treatment for preventing the K+ ion leaching. The ceramic sample fabricated by the ordinary firing of the hydrothermal BKT powder at 1060 °C for 2 h had a high density of 94.5 % and showed superior dielectric, ferroelectric, and piezoelectric properties.

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Acknowledgements

This work was supported by a Grant-in-Aid for Research Activity Start-up (No. 25889049) from the Japan Society for the Promotion of Science (JSPS).

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan

    Manabu Hagiwara & Shinobu Fujihara

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  1. Manabu Hagiwara
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  2. Shinobu Fujihara
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Correspondence to Manabu Hagiwara.

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Hagiwara, M., Fujihara, S. Fabrication of dense (Bi1/2K1/2)TiO3 ceramics using hydrothermally derived fine powders. J Mater Sci 50, 5970–5977 (2015). https://doi.org/10.1007/s10853-015-9144-4

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  • DOI: https://doi.org/10.1007/s10853-015-9144-4

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