Low-Temperature Sintering and Piezoelectric Properties of CuO-Added 0.95(Na0.5K0.5)NbO3–0.05BaTiO3 Ceramics |
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| Authors: | Hwi-Yeol Park Cheol-Woo Ahn Kyung-Hoon Cho Sahn Nahm Hyeung-Gyu Lee Hyung-Won Kang Duk-Hee Kim Kyeong-Soon Park |
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| Affiliation: | Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea;
Korea Electronics Technology Institute, Gyeonggi-do 463-816, Korea;
Innochips Tecnology, Kyungi-Do 429-010, Korea;
Department of Advanced Materials Engineering, Sejong University, Seoul 143-747, Korea |
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| Abstract: | The sintering temperature of 0.95(Na0.5K0.5)NbO3–0.05BaTiO3 (NKN–BT) ceramics needs to be decreased below 1000°C to prevent Na2O evaporation, which can cause difficulties in poling and may eventually degrade their piezoelectric properties. NKN–BT ceramics containing CuO were well sintered at 950°C with grain growth. Poling was easy for all specimens. Densification and grain growth were explained by the formation of a liquid phase. The addition of CuO improved the piezoelectric properties by increasing the grain size and density. High piezoelectric properties of d 33=230 pC/N, k p=37%, and ?3T/?0=1150 were obtained from the specimen containing 1.0 mol% of CuO synthesized by the conventional solid-state method. |
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