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PZT Aerogels: Sol-Gel Derived Piezoelectric 3-3 Composites

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Abstract

Ultrasonic transducers with low acoustic impedances are required for applications in gaseous media. In porous piezoelectrics the pore volume acts as a second medium of a solid-gas composite and thus lowers the overall acoustic impedance. Lead zirconate titanate (PbZr.53Ti.47O3, PZT) aerogels were prepared by sol-gel processing and supercritical drying in isopropanol. Prefiring at 400°C in air and subsequent thermal treatment in saturated PbO-atmosphere results in phase transformation to PZT (perovskite phase), grain growth and aerogel densification. In this paper the densification of this new class of piezoelectric material at temperatures above 600°C is described. Porosities were measured as a function of sintering time and temperature. Changes in the microstructure were characterized by scanning electron microscopy. Dielectric measurements are presented.

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Authors and Affiliations

  1. Fraunhofer Institut für Silicatforschung, Neunerplatz 2, D-97082, Würzburg, Germany

    Peer Löbmann & Walther Glaubitt

  2. Physikalisches Institut der Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany

    Stefan Geis

Authors
  1. Peer Löbmann
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  2. Walther Glaubitt
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  3. Stefan Geis
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Löbmann, P., Glaubitt, W. & Geis, S. PZT Aerogels: Sol-Gel Derived Piezoelectric 3-3 Composites. Journal of Sol-Gel Science and Technology 19, 145–148 (2000). https://doi.org/10.1023/A:1008755414899

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  • DOI: https://doi.org/10.1023/A:1008755414899

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