Microstructure and Piezoelectric Properties of 0.95(Na0.5K0.5)NbO3–0.05SrTiO3 Ceramics |
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| Authors: | Kyung-Hoon Cho Hwi-Yeol Park Cheol-Woo Ahn Sahn Nahm Kenji Uchino Seung-Ho Park Hyeung-Gyu Lee Hwack-Joo Lee |
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| Affiliation: | Department of Materials Science and Engineering, Korea University, Seoul 136-713, Korea; International Center for Actuators and Transducers, Material Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802; Korea Electronics Technology Institute, Gyeonggi-do 463-816, Korea; Korea Research Institute of Standards and Science, New Materials Evaluation Center, Taejon 305-600, Korea |
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| Abstract: | The 0.95(Na0.5K0.5)NbO3–0.05SrTiO3 (0.95NKN–0.05ST) ceramics formed in this study had a porous microstructure with small grains and low piezoelectric properties due to their low density. However, when a small amount of Na2O was intentionally subtracted from the 0.95NKN–0.05ST ceramics, a liquid phase was formed, which led to increased density and grain size. Piezoelectric properties were also improved for the Na2O-subtracted 0.95NKN–0.05ST ceramics. The increased density and grain size were responsible for the enhancement of the piezoelectric properties. In particular, the 0.95(Na0.49K0.5)NbO2.995–0.05ST ceramics showed high piezoelectric properties of d 33=220, k p=0.4, Q m=72, and ?3T/?o=1447, thereby demonstrating their promising potential as a candidate material for application to lead-free piezoelectric ceramics. |
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