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.
CitationMarcos, F. [et al.]. Effects of poling process on KNN-modified piezoceramic properties. "Journal of the American Ceramic Society", Febrer 2010, vol. 93, núm. 2, p. 318-321.