1. Effect of Sintering Temperature on Electrical Properties of Na0.5K0.5NbO3Lead-Free Piezoelectric Ceramics Prepared by Normal Sintering
- Author
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Jing-Feng Li, Xiao-Nian Ding, Hailong Zhang, Li-Min Zhang, and Bo-Ping Zhang
- Subjects
Volatilisation ,Materials science ,Analytical chemistry ,Sintering ,Dielectric ,Condensed Matter Physics ,Microstructure ,Piezoelectricity ,Electronic, Optical and Magnetic Materials ,visual_art ,Phase (matter) ,visual_art.visual_art_medium ,Orthorhombic crystal system ,Ceramic - Abstract
The effects of sintering temperature on microstructure, density and electrical properties of Na0.5K0.5NbO3 prepared by normal sintering at 1020–1100°C were investigated. All the Na0.5K0.5NbO3 ceramics showed an orthorhombic structure similar to that of KNbO3 ceramics, while raising sintering temperature resulted in the shifting of diffraction peaks to a lower value and the formation of a second phase due to the excess volatilization of Na. Both density and d33 of the sintered samples increase with increasing sintering temperature. The density of the sample sintered at 1080°C reaches a maximum value (4.22 g/cm3, 92% of the theoretical density). The sample sintered at 1060°C showed a maximum d33 value of about 122 pC/N and the highest T c of about 409°C, and the corresponding E c and P r were about 13 kV/cm and 15 μ C/cm2, respectively.
- Published
- 2007