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Effect of vapor thermolysis on microstructure development of sol–gel-derived lead zirconate–titanate (PZT) and PZT-Sr(K0.25Nb0.75)O3 solid solutions

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Abstract

Ceramic granules of PZT (Pb(Zr53,Ti47)O3) and fibers of SKN-doped PZT (1 Mol-% Sr(K0.25Nb0.75)O3 substitution in PZT) were fabricated from sol–gel precursors. The transformation of the metal–organic gel to the oxide and its crystallization behavior was investigated by thermogravitmetry, and XRD. The formation of pyrochlore or perovskite phase was sensitive to the preceeding heat treatment conditions in moist atmosphere (termed vapor thermolysis). Lower thermolysis temperatures resulted in the preferred formation of metastable pyrochlore phase. Higher thermolysis temperatures favored the formation of perovskite. Investigation of sintered materials revealed a superior sintering activity for samples with pronounced intermediate pyrochlore content whereas low-pyrochlore samples remained highly porous after sintering. For constant chemical precursors the vapour thermolysis conditions (220–280 °C) siginificantly affected crystallization and sintering behavior of the PZT and SKN-PZT material.

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Acknowledgments

The authors are obliged to Silke Stöckl for performing experiments with the PZT granules and Oliver Schüßler for synthesis of the sol–gel precursors.

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Authors and Affiliations

  1. Department of Functional Materials in Medicine and Dentistry, Universitätsklinikum Würzburg, Würzburg, Germany

    Reinhard Krüger

  2. Westfälische Wilhelms-Universität Münster, Institute for Inorganic and Analytic Chemistry, Münster, Germany

    Kerstin Schmale

  3. Fraunhofer Institute for Silicate Research, Würzburg, Germany

    Reinhard Krüger & Kerstin Schmale

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  1. Reinhard Krüger
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  2. Kerstin Schmale
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Correspondence to Reinhard Krüger.

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Krüger, R., Schmale, K. Effect of vapor thermolysis on microstructure development of sol–gel-derived lead zirconate–titanate (PZT) and PZT-Sr(K0.25Nb0.75)O3 solid solutions. J Sol-Gel Sci Technol 55, 66–72 (2010). https://doi.org/10.1007/s10971-010-2216-7

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  • DOI: https://doi.org/10.1007/s10971-010-2216-7

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