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Effect of Sintering Temperature on Microstructure and Electric Properties of 0.95(K0.5Na0.5)NbO3–0.05Li(Nb0.5Sb0.5)O3with Copper Oxide Sintering Aid

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The 0.95(K0.5Na0.5NbO3)–0.05Li(Nb0.5Sb0.5)O3 doped with 0.8 mol% copper oxide (CuO) lead-free piezoelectric ceramics were synthesized by conventional solid-state reaction route. The introduction of CuO could significantly improve the sinterability of 0.95(K0.5Na0.5NbO3)–0.05Li(Nb0.5Sb0.5)O3 ceramics. The grain size of the specimen was considerably decreased due to the formation of a large amount of liquid phase when the sintering temperature exceeded 960°C. The piezoelectric constant (d33), planar electromechanical coupling (kp), and dielectric constant ( ) values increased with increasing relative density and grain size. The improved piezoelectric and dielectric properties of d33=207 pC/N, kp=44%, tan =0.0137, Qm=320, and =340 can be obtained for specimens sintered at 960°C for 2 h.
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Document Type: Research Article

Affiliations: State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Publication date: 2011-03-01

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