Lead-free piezoelectric ceramics have been attracted attention as new piezoelectric materials in place of PbZrO3–PbTiO3 (PZT) based ceramics because of environmental protection reasons [1–4]. Recently, K0.5Na0.5NbO3 (abbreviated as KNN) based ceramics has been paid much
attention for lead-free piezoelectric ceramics since Saito et al. [6] had developed KNN-based textured ceramics with properties comparable to those of a basic, unmodified PZT ceramics [5–8]. However, it was difficult to dense pure KNN ceramics by ordinary solid-state method [9], the reasons were that the phase stability of pure KNN ceramics is limited to 1140ºC according to the phase diagram for KNbO3–NaNbO3 [5]. Therefore, high sintering temperature is not possible. In addition, Na2O and K2O easily evaporate at high temperature,
which change stoichiometry of KNN ceramics slightly and lead to the formation of extra phase [1].
Relation:
Processdings of 2008 International Workshop on Next Generation Electronics, pp.95-96 2008 Internaonal Workshop in Next Generation Electronicsd Internaonal Symposium on Nano Science and Technoogy 2008 IWNE
