Dresden 2006 – wissenschaftliches Programm
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DF: Dielektrische Festkörper
DF 4: Internal Symposium “Ferroelectric Materials for Smart Structures”
DF 4.4: Vortrag
Dienstag, 28. März 2006, 10:50–11:10, K{\"O}N Farb
Templated grain growth of lead zirconate titanate — •Thomas Richter1, Morgane Radanielina1, Carsten Schuh1, Reinhard Krüger2, Dieter Sporn2, Christoph Pientschke3, Horst Beige3, Gennadij Lissatschenko4, and Hugo Schlich4 — 1Siemens AG; Corporate Technology, Ceramics Department; Otto-Hahn-Ring 6; 81739 Munich, Germany — 2Fraunhofer Institut Silicatforschung — 3Universität Halle-Wittenberg — 4MaTecK GmbH
For maximising the piezoelectric performance of lead zirconate titanate (PZT) textured polycrystalline ceramics or even single crystals would be advantageous. However, PZT single-crystal growth from melt is impossible due to the incongruent melting behaviour. So, the PZT is to be texturised by secondary recrystallisation of introduced seeds in a fine-grained matrix. By the texturising of electrical ceramics the dielectric and the piezoelectric characteristics can be increased up to 80% of those of single crystals. In the present work growth ability was first studied by very coarse-grained PZT fibres in a fine-grained PZT matrix. The sintering took place both statically in a chamber furnace and dynamically in a temperature gradient furnace. The aim of these results is to develop an understanding for the growth of those seeds. The maximum in growth distance between the original fibre boundary and the boundary between the grown region and the matrix (average grain size about 6 micrometer) was measured at 45 micrometer. The most important parameters for recrystallisation were the temperature gradient of the temperature gradient furnace and the PbO excess of the samples.