Effects of CuO on the Electrical Properties of CaTiO3-Modified [(Na0.52K0.48)0.955Li0.045](Nb0.955Sb0.045)O3 Lead-Free Piezoceramics
CuO-doped and undoped 0.99[(Na0.52K0.48)0.955Li0.045](Nb0.955Sb0.045)O3–0.01CaTiO3 (KNNLSCT) lead-free piezoelectric ceramics have been synthesized by the conventional ceramic processing, where the effects of CuO on the phase structure and electrical properties were studied. All ceramics possess a perovskite structure with tetragonal symmetry. Because of the dipolar complex migration, the P–E loops of undoped ceramics become slanted and constricted at a high temperature, while this phenomenon disappears after the addition of CuO. The d33 value decreases with the increasing poling temperature for the undoped ceramics, while the d33 value increases with the increasing poling temperature after the addition of CuO. These phenomena have been explained by a model based on the formation of the defect polarization induced by spontaneous polarization, indicating that the spontaneous defect polarization has an important influence on the ferroelectric behavior of the KNNLSCT ceramics.
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Document Type: Research Article
Affiliations: College of Materials Science, Sichuan University, Chengdu 610064, China
Publication date: 01 September 2010