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Effects of Poling Process on KNN‐Modified Piezoceramic Properties
Author(s) -
RubioMarcos F.,
Romero Juan J.,
Ochoa Diego A.,
García Jose E.,
Perez Rafael,
Fernandez José F.
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03404.x
Subject(s) - poling , materials science , tetragonal crystal system , orthorhombic crystal system , raman spectroscopy , piezoelectricity , phase transition , polarization (electrochemistry) , diffraction , phase (matter) , composite material , crystallography , condensed matter physics , optics , optoelectronics , crystal structure , dielectric , chemistry , ferroelectricity , physics , organic chemistry
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.