Microstructure and Piezoelectric Properties of (1−x)(Na0.5K0.5)NbO3–xLiNbO3 Ceramics |
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| Authors: | Hyun-Cheol Song Kyung-Hoon Cho Hwi-Yeol Park Cheol-Woo Ahn Sahn Nahm Kenji Uchino Seung-Ho Park Hyeung-Gyu Lee |
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| Affiliation: | Thin Films Materials Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea; Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea; International Center for Actuators and Transducers, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802; Korea Electronics Technology Institute, Gyeonggi-do 463-816, Korea |
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| Abstract: | (1? x )(Na0.5K0.5)NbO3– x LiNbO3 (1? x )NKN– x LN] ceramics were produced by the conventional solid-state sintering method, and their microstructure and piezoelectric properties were investigated. The formation of the liquid phase and K6Li4Nb10O30 second phase that were observed in the (1? x )NKN– x LN ceramics was explained by the evaporation of Na2O during the sintering. A morphotropic phase boundary (MPB) was observed in the specimens with 0.05< x <0.08. Promising piezoelectric properties were obtained for the specimens with x =0.07. Therefore, the piezoelectric properties of this 0.93NKN–0.07LN ceramic were further investigated and were found to be influenced by their relative density and grain size. In particular, grain size considerably affected the d 33 value. Two-step sintering was conducted at different temperatures to increase the grain size. Piezoelectric properties of d 33=240 (pC/N) and k p=0.35 were obtained for the 0.93NKN–0.07LN ceramics sintered at 1030°C and subsequently annealed at 1050°C. |
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