Article ID Journal Published Year Pages File Type
7898159 Journal of the European Ceramic Society 2018 7 Pages PDF
Abstract
The structural interpretation and electrical properties of perovskite layer structured (PLS) Sr2Nb2O7-xwt%CuO ceramics prepared by solid-state reaction method are investigated. The chemical interpretation of enhanced piezoelectricity is confirmed to be attributed to the rotation and/or distortion of oxygen octahedron caused by possible Cu2+ substitution at the A-site of Sr2Nb2O7 by XRD refinement and variable-temperature Raman spectra. Sr2Nb2O7-xwt%CuO (x = 0.3, 0.5 and 0.7) ceramics shows enhanced ferroelectric properties with a larger Pr of ∼4.1 μC/cm2 and a smaller Ec of ∼63.1 kV/cm. This study further explains the cations in A-site play a major structural role in the polarization process for PLS system. It was found that dielectric breakdown strength increases up to 258.8 kV/cm and then decreases gradually with the increase of CuO content. Impedance spectroscopy indicated that CuO addition could be helpful in increasing the grain boundary resistance then dielectric breakdown strength.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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