Abstract
In this contribution the effect of alkaline-earth (AE) dopants Mg 2+, Ca 2+, Sr 2+ and Ba 2+ on sinterability and functional response of KNN is studied. Ceramic powders with the general formula (K 0.5Na 0.5) 1−2 y AE y NbO 3, y = 0.005 were prepared by classical ceramic processing. The values of 94–95% of theoretical density (TD) are obtained for stoichiometric KNN after sintering at 1115 °C for 2 h. Calcium and strontium doping promotes densification while magnesium doping inhibits it. In the case of Ba-doping a secondary phase forms. The dielectric constant and piezo d 33 coefficient determined by Berlincourt piezo d 33-meter of Ca and Sr-doped KNN ceramics are 500 and 95 pC/N, respectively, while the values for undoped KNN are slightly lower.
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