Evolution of Crystallographic Grain Orientation of (K0.5Na0.5)NbO3 Piezoelectric Ceramics |
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| Journal | Key Engineering Materials (Volume 320) |
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| Volume | Electroceramics in Japan IX |
| Edited by | Keiichi Katayama, Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki |
| Pages | 3-6 |
| DOI | 10.4028/www.scientific.net/KEM.320.3 |
| Citation | Hisaaki Takao et al., 2006, Key Engineering Materials, 320, 3 |
| Online since | September, 2006 |
| Authors | Hisaaki Takao, Yasuyoshi Saito, Yoshifumi Aoki, Kayo Horibuchi |
| Keywords | Lead-Free, Microstructure, Niobates, Orientation, Piezoelectric Materials, Sintering |
| Abstract | The microstructural development of crystalline-oriented (K0.5Na0.5)NbO3 (described as KNN hereafter)-based piezoelectric ceramics during sintering was investigated. The addition of CuO as a sintering aid was found to be effective for fabricating highly oriented and dense KNN ceramics. KNN specimens with 0.5-1.0 mol% CuO sintered at 1100ÂșC for 1 h have both a relative density and a pseudo-cubic {100} orientation degree of 95% or higher. In the early stages of sintering, KNN is formed in the reaction between complementary reactants NaNbO3 and KNbO3, after which oriented grain growth proceeds at a relative density of more than 90%. In addition, the results of TEM observation showed that textured KNN ceramics have a unique pectinate-like domain structure, in which the domain walls consist of {101} planes. |
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