Low temperature sintering of lead-free Bi0.5(Na0.82K0.18)0.5TiO3 piezoelectric ceramics by co-doping with CuO and Nb2O5 |
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| Authors: | Nam Binh Do Hyun Deok Jang Inki Hong Hyoung Su Han Duc Thang Le Weon Pil Tai Jae Shin Lee |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea;2. Ulsan Fine Chemical Industry Center, Ulsan Techno Park, Ulsan 681-802, Republic of Korea |
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| Abstract: | Effect of excess CuO additive on the sintering behavior and piezoelectric properties of Bi0.5(Na82K0.18)0.5TiO3 ceramics was investigated. The addition of small amount of excess CuO as low as 1 mol% was quite effective to lower the sintering temperature (Ts) of BNKT ceramics down to 975 °C while their piezoelectric properties were degraded by Cu doping. However, the electric field-induced strain was markedly enhanced by further addition of Nb2O5 with CuO without elevating Ts. The normalized strain Smax/Emax of 427 pm/V was obtained with a specimen sintered with 0.02 mol CuO and 0.03 mol Nb2O5 in excess. |
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