Effects of K4CuNb8O23 and GeO2 addition on microstructure and piezoelectric properties in KNbO3 ceramics
| Autor: | Hiroki Kato, Yumi Akiyama, Mirai Ishida |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) General Engineering Analytical chemistry General Physics and Astronomy Sintering Microstructure 01 natural sciences Decomposition Piezoelectricity Phase (matter) visual_art 0103 physical sciences Electromechanical coupling visual_art.visual_art_medium Ceramic |
| Zdroj: | Japanese Journal of Applied Physics. 58:SLLD03 |
| ISSN: | 1347-4065 0021-4922 |
| Popis: | A combined additives study of lead-free KNbO3 (KN) ceramics in the solid-state reaction was performed to improve the mechanical quality factor (Q m) for high power piezoelectric applications. Improved Q m values of 1137 and 1241 were confirmed in KN specimens with addition of 1.0 mol% K4CuNb8O23 (KCN) and 1.0 mol% KCN + 0.5 wt% GeO2, respectively. It is important for achievement of the higher Q m in KN systems to control the composition of the Cu segregated phase. In this study, the Cu segregated phase which was necessary to improve the Q m resulted from decomposition of the KCN compound during the sintering. Co-doping of KCN and GeO2 to KN specimens has a remarkable effect in suppressing the deliquescence accompanying KCN addition and improvement of the Q m without significant deterioration of the electromechanical coupling factor k 31. |
| Databáze: | OpenAIRE |
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