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DF: Dielektrische Festkörper

DF 9: Phase Transitions

DF 9.4: Vortrag

Donnerstag, 30. März 2006, 11:10–11:30, M{\"U}L Elch

Poling Effect on the Ferroelectric and Transport Properties of Soft Piezoelectric PZT — •T.M. Kamel, F. X. N. M. Kools, and G. de With — Laboratory of Materials and Interface Chemistry, Eindhoven University of Technology, 5600 MB Eindhoven, the Netherlands

The properties of the piezoelectric ceramic materials are strongly dependent on the degree of polarization as set by the poling process. In the present work a soft piezoceramic PZT material was polarized at different poling conditions. Three different methods were used to evaluate the polarization state in the material. These are the polarization current, pyroelectric coefficient and the hysteresis loop measurements. The polarization current was monitored during the poling process at different applied electric fields, poling time and temperature. The pyroelectric coefficient and hence the polarization was calculated form the pyroelectric current vs. temperature. The hysteresis loop was displayed using a home-made computerized Sawyer-Tower circuit. The dielectric, ferroelectric and piezoelectric properties were measured as a function of temperature and frequency after different poling conditions. The effects of the various poling conditions on the functional and physical properties of the soft PZT are presently discussed.