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Low-Temperature Sintering of (K0.5Na0.5)NbO3 Piezoelectric Ceramics

(K0.5Na0.5)NbO3 piezoelectric ceramics can be sintered at a temperature as low as 750 °C for 5 h by incorporating Li2CO3 + Bi2O3 + ZnO as the sintering aid, whereas the conventional sintering temperature is around 1,100 °C. The optimal “soft” piezoelectric properties are obtained for ceramics sintered at 850 °C for 5 h. The dielectric permittivity (ε), piezoelectric coefficient (d 33), electromechanical coupling (k p) and mechanical quality factors (Q m) of (K, Na)NbO3 modified with 5.5 wt% sintering aids are 1,436, 90 pC/N, 0.3 and 10, respectively. These values are similar to the values obtained for (K0.5Na0.5)NbO3 ceramics sintered above 1,100 °C. The underlying mechanism for abrupt change of dielectric permittivity is explained.

Authors:   Xuming Pang, Jinhao Qiu, Kongjun Zhu, Honghui Gu
Journal:   Journal of Inorganic and Organometallic Polymers and Materials
Year:   2012
Pages:   1
DOI:   10.1007/s10904-012-9790-9
Publication date:   09-Nov-2012
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