Effects of Poling Process on KNN-Modified Piezoceramic Properties

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The influence of the orthorhombic to tetragonal phase transition near room temperature in the poling process of KNN-modified piezoceramics was studied. Poling temperatures of 25° and 120°C were used. The percentage of 90° domains reorientation induced by poling was evaluated trough X-ray diffraction analysis. The improvement of the piezoelectric properties when the poling temperature was 25°C could not be explained by the reorientation of 90° domains alone. Raman spectroscopy evidenced that the polarization process was assisted by the stabilization of orthorhombic phase, which promotes a stress reduction in the material.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2009.03404.x

Affiliations: 1: Electroceramic Department, Instituto de Cerámica y Vidrio, CSIC, 28049 Madrid, Spain 2: Department of Applied Physics, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain

Publication date: February 1, 2010

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