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Microstructure and ferroelectric properties of soft-doped sol–gel derived PZT/SKN fibers

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Abstract

Sol–gel derived PZT/SKN fibers with a final composition of 0.98(PbO)1+z (Zr0.53Ti0.47)O2-0.02Sr(K0.25Nb0.75)O3 and a PbO content of z = +0.04 and +0.14 in the spinning sol were sintered at different temperatures. Fiber stoichiometry, phase content and microstructure as well as the physical properties of the fibers were investigated. A fully densified microstructure independent from the initial PbO content was obtained for fibers sintered at 950 °C or higher. Enhanced porosity was found only for fibers sintered at 900 °C. The densification of the fiber batches at the lower temperatures is dominated by solid state sintering, while liquid phase sintering is promoted by sintering at temperatures above 900 °C. TEM investigations confirmed the homogeneous nature of the PZT/SKN fibers devoid of compositional gradients. Typical dielectric permittivity is in the range of 650–1000. The ferroelectric hysteresis loops are well pronounced showing typical soft-doped behavior with remanent polarization values in the range of 15 and 34 μC/cm2 and coercivities of about 1.9 V/μm.

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Acknowledgements

This research has been supported by the Deutsche Forschungsgemeinschaft (DFG), SPP 734 through grants Br 923/4 and Mu 720/16. The stimulating discussions with the mentors of SPP 734, Prof. Thomann and Prof. Härdtl as well as B. Hildmann, DLR, are gratefully acknowledged. The authors appreciate the TEM preparation work performed by G. Paul, DLR.

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Authors and Affiliations

  1. Landeskriminalamt NRW, SG51.1, Völklingerstrasse 49, 40221, Dusseldorf, Germany

    Ralf Hansch

  2. Materials Research Institute, German Aerospace Center (DLR), 51147, Cologne, Germany

    Wolfgang Braue

  3. Ludwig-Thoma-Str., Wertingen, Germany

    Susanne Seifert

  4. Fraunhofer-Institut für Silicatforschung, Neunerplatz 2, 97082, Wuerzburg, Germany

    Dieter Sporn & Gerd Müller

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  1. Ralf Hansch
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  2. Wolfgang Braue
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  3. Susanne Seifert
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  4. Dieter Sporn
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  5. Gerd Müller
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Correspondence to Ralf Hansch.

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Hansch, R., Braue, W., Seifert, S. et al. Microstructure and ferroelectric properties of soft-doped sol–gel derived PZT/SKN fibers. J Mater Sci 42, 7316–7323 (2007). https://doi.org/10.1007/s10853-006-1168-3

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  • DOI: https://doi.org/10.1007/s10853-006-1168-3

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