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DF: Fachverband Dielektrische Festkörper
DF 14: Dielectric composites and functionally graded materials; ceramics
DF 14.2: Talk
Thursday, March 17, 2011, 11:40–12:00, MÜL Elch
Piezoelectric characterisation of single ceramic fibres — •Sabine Kern, Ralf Steinhausen, Christoph Pientschke, and Horst Beige — Martin-Luther-University Halle-Wittenberg, Physics Department, PFM, 06099 Halle, Germany
Ceramic-polymer composites containing embedded piezoelectric ceramic fibres in a polymer matrix are favourable for application as ultrasonic transducers due to their low acoustic impedance, the high electromechanical coupling coefficient, as well as the high aspect ratio of the ceramic part. To optimise the composite’s properties, knowledge of the electromechanical properties of the fibre itself is advantageous. A method to measure the piezoelectric strain loops for single ceramic fibres was developed. Using a capacitive displacement sensor, the present measurement method also allows the determination of the low-voltage piezoelectric coefficient d33 due to its high sensitivity. Reference measurements had shown that the electromechanical properties were measured with good accuracy. PZT fibres with diameters of 250-750 µ m were characterised regarding the high-field bipolar and unipolar strain-field dependence and also the low-field piezoelectric coefficient. Moreover, the dependence of the polarisation regime was studied and discussed.