| Presentation | 2021-10-27 Characteristics of K0.45Na0.55NbO3 ceramics fabricated from a mixed powder of K0.4Na0.6NbO3 and K0.5Na0.5NbO3 Tomoki Saikyo, Ryo Kobayashi, Noriko Bamba, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In order to improve the piezoelectric constant, d33, of K0.45Na0.55NbO3 ceramics, which is a typical base material composition of potassium sodium niobate solid solution, the grain size dependence of d33 was investigated in this study. Two kinds of powders were used for two-step sintering to produce ceramics of varying average grain size: a mixed powder of K0.4Na0.6NbO3 and K0.5Na0.5NbO3 and a single-phase K0.45Na0.55NbO3 powder. As a result, ceramics with average grain size of about 2?m to 5.5?m were obtained. It was confirmed that the single-phase powder and the mixed powder had different sinterability, and that the mixed powder promoted diffusion more than the single-phase powder. When the single-phase powder and the mixed powder were sintered under the same conditions, there was no significant difference in the Curie temperature, TC. However, the TC decreased in both powders with increasing heating time at high temperatures. The grain size dependence of d33 was obtained, and the optimum average grain size of K0.45Na0.55NbO3 ceramic was estimated within about 2 to 3 ?m. The maximum d33 value in this study was 126 pC/N for ceramics with an average grain size of approximately 2.4 ?m fabricated from the mixed powder. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Potassium sodium niobate ceramics / K0.45Na0.55NbO3 / Mixed powder / Piezoelectric constant d33 / Grain size |
| Paper # | CPM2021-33 |
| Date of Issue | 2021-10-20 (CPM) |
| Conference Information | |
| Committee | CPM |
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| Conference Date | 2021/10/27(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Functional materials (semiconductors, magnetic materials, dielectrics, transparent conductors / semiconductors, etc.) thin film processes / materials / devices, etc. |
| Chair | Yuichi Nakamura(Toyohashi Univ. of Tech.) |
| Vice Chair | Hideki Nakazawa(Hirosaki Univ.) |
| Secretary | Hideki Nakazawa(Ehime Univ.) |
| Assistant | Yasuo Kimura(Tokyo Univ. of Tech.) / Fumihiko Hirose(Yamagata Univ.) / Noriko Bamba(Shinshu Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Component Parts and Materials |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Characteristics of K0.45Na0.55NbO3 ceramics fabricated from a mixed powder of K0.4Na0.6NbO3 and K0.5Na0.5NbO3 |
| Sub Title (in English) | |
| Keyword(1) | Potassium sodium niobate ceramics |
| Keyword(2) | K0.45Na0.55NbO3 |
| Keyword(3) | Mixed powder |
| Keyword(4) | Piezoelectric constant d33 |
| Keyword(5) | Grain size |
| 1st Author's Name | Tomoki Saikyo |
| 1st Author's Affiliation | Shinshu University(Shinshu Univ.) |
| 2nd Author's Name | Ryo Kobayashi |
| 2nd Author's Affiliation | Shinshu University(Shinshu Univ.) |
| 3rd Author's Name | Noriko Bamba |
| 3rd Author's Affiliation | Shinshu University(Shinshu Univ.) |
| Date | 2021-10-27 |
| Paper # | CPM2021-33 |
| Volume (vol) | vol.121 |
| Number (no) | CPM-220 |
| Page | pp.pp.51-56(CPM), |
| #Pages | 6 |
| Date of Issue | 2021-10-20 (CPM) |