Chemical interpretation, enhanced ferroelectric property and dielectric breakdown strength of CuO-added Sr2Nb2O7 ceramics. Issue 9 (August 2018)

• Record Type: Journal Article
• Authors: Chen, Tao; Liang, Ruihong; Zhou, Zhiyong; Jiang, Kai; Hu, Zhigao; Dong, Xianlin
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 9(2018)
• Page Start: 3147
• Page End: 3153
• Publication Date: 2018-08
• Subjects: Perovskite layered structure -- Piezoelectricity -- Ferroelectricity -- Dielectric breakdown -- Oxygen octahedron; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.03.029
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The structural interpretation and electrical properties of perovskite layer structured (PLS) Sr2 Nb2 O7 - x wt%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 Cu 2+ substitution at the A-site of Sr2 Nb2 O7 by XRD refinement and variable-temperature Raman spectra. Sr2 Nb2 O7 - x wt%CuO ( x = 0.3, 0.5 and 0.7) ceramics shows enhanced ferroelectric properties with a larger Pr of ∼4.1 μC/cm 2 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.