Microstructure and piezoelectric properties of (Na0.5K0.5)NbO3 lead-free piezoelectric ceramics with V2O5 addition |
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| Authors: | Seo I.-T. Park H.-Y. Dung N.V. Choi M.-K. Nahm S. Lee H.-G. Choi B.-H. |
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| Affiliation: | Department of Materials Science and Engineering, Korea University, Seoul, Korea; |
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| Abstract: | Various amounts of Nb2O5 in the (Na0.5K0.5) NbO3 (NKN) ceramic were replaced by V2O5 to decrease its sintering temperature to below 950°C. A small V2O5 content resulted in a dense microstructure with an increased grain size for the specimen sintered at 900°C due to the presence of a liquid phase. When V2O5 was added to the NKN ceramics, their orthorhombic-to-tetragonal transition temperature increased from 178°C to around 200°C. However, their Curie temperature decreased from 402°C to around 330°C. The kp, ε3 T/ε0, and Qm values increased with V2O5 addition, probably due to the increased density and poling state, which was identified by the phase angle. The specimen with x = 0.05, sintered at 900°C for 8 h, exhibited the following piezoelectric properties: kp = 0.32, ε3 T/ε0 = 245, d33 = 120 (pC/N), and Qm = 232. |
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