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Effect of CuO on the sintering temperature and piezoelectric properties of lead-free 0.95(Na0.5K0.5)NbO3-0.05CaTiO3 ceramics |
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| Authors: | Seok-Jung Park Kyung-Hoon Cho Hyeung-Gyu Lee Byung-Hyun Choi |
| Affiliation: | a Department of Materials Science and Engineering, Korea University, 1-5 Ka, Anam-Dong, Sungbuk-Gu, Seoul 136-701, Republic of Korea b Korea Electronics Technology Institute, 68 Yatap-Dong, Bundang-Gu, Seongnam-Si, Gyeonggi-Do 463-816, Republic of Korea c Innochips Technology, 418-21, Daeya-Dong, Shiheung-Si, Gyeonggi-Do 429-010, Republic of Korea d Korea Institute of Ceramic Engineering and Technology, 233-5, Gasan-Dong, Guemcheon-Gu, Seoul 153-801, Republic of Korea |
| Abstract: | The addition of a small amount of CuO to the 0.95(Na0.5K0.5)NbO3-0.05CaTiO3 (0.95NKN-0.05CT) ceramics sintered at 960 °C for 10 h produced a dense microstructure with large grains due to the liquid phase sintering. Due to the negligible Na2O evaporation, poling was easy for all specimens sintered at 960 °C. The piezoelectric properties of the specimens were considerably influenced by the relative density, grain size and liquid phase amount. The high piezoelectric properties of d33 = 200 pC/N, kp = 0.37,  and Qm = 350 were obtained for the 0.95NKN-0.05CT ceramics containing 2.0 mol% CuO sintered at 960 °C for 10 h. Therefore, the 0.95NKN-0.05CT ceramics containing a small amount of CuO are a good candidate material for lead-free piezoelectric ceramics. |
| Keywords: | A Ceramics C Electron microscopy C X-ray diffraction D Microstructure D Piezoelectricity |
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