Fabrication of (SrxK0.5-xNa0.5-x)NbO3Pizoelectric Ceramics and Effects of MnO Addition on Their Piezoelectric Properties
| Autor: | Toshihiko Wada, Shinjiro Tashiro, Keisuke Ishii |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Poling General Engineering Analytical chemistry General Physics and Astronomy Mineralogy Piezoelectricity Grain size law.invention Grain growth Electrical resistivity and conductivity law visual_art visual_art.visual_art_medium Calcination Ceramic Perovskite (structure) |
| Zdroj: | Japanese Journal of Applied Physics. 45:7449-7454 |
| ISSN: | 1347-4065 0021-4922 |
| Popis: | Piezoelectric properties were investigated in (K,Na)NbO3 ceramics whose K and Na were substituted with Sr at 1 to 5 mol % to rearize high piezoelectric properties. The maximum piezoelectricity was obtained in the sample with 3 mol % Sr substitution. However, the grain size of the sample was as large as 40 µm. Furthermore, the resistivity was as low as 108 Ω cm and it was consequently unable to apply sufficient electric fields in the poling process. A MnO was added to suppress grain growth anomaly and withstand voltage increase. The powder obtained from a previously calcined mixture of Nb2O5 and MnCO3 was used as a raw material for MnO addition. By adding MnO above 0.05 mol %, grain growth anomaly was inhibited. By adding MnO above 3 mol %, the resistivity was above 1010 Ω cm and the mechanical quality factor was above 500. Even if 10 mol % MnO was added, the sample was dense and showed a perovskite single phase. |
| Databáze: | OpenAIRE |
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