Mgbemere, Henry EkeneHenry EkeneMgbemereHerber, Ralf-PeterRalf-PeterHerberSchneider, Gerold A.Gerold A.SchneiderDeutsche Forschungsgemeinschaft2010-01-132010-01-132009-06-13Journal of the European Ceramic Society 29 (2009) 3273–3278616349122http://tubdok.tub.tuhh.de/handle/11420/746Potassium sodium niobate (KNN) piezoelectric ceramics and KNN substituted with lithium (Li+) and antimony (Sb5+) have been synthesized by the conventional solid state sintering method. This work focuses on the phase transition in the KNN system at potassium (K+) content of approximately 0.35. Therefore, K amount was altered from 0.31 to 0.35. Additionally, Li+ and Sb5+ were used for partial substitution (up to 8% for Sb) thereby enhancing the piezoelectric and dielectric properties. However, addition of Li+ and Sb5+ also lead to a decrease in both the Curie temperature (TC) and the first order phase transition temperature (TT-O) of the ceramics. Addition of more than 4 mol% of Li+ led to the formation of extra phases. The piezoelectric properties within the given composition range were found to be optimum at (K0.34Na0.64Li0.02)(Nb0.96Sb0.04)O3. A piezoelectric charge coefficient (d33) of 404 pm/V for this composition was obtained from unipolar strain hysteresis measurements.en0955-2219200932733278Elsevierhttp://doku.b.tu-harburg.de/doku/lic_ohne_pod.phpKNN-keramik, keramikherstellung, piezokeramikKNN ceramics, ceramic processing, piezoelectricsIngenieurwissenschaftenJournal Article2010-01-21urn:nbn:de:101:1-20150527211410.15480/882.744Keramische Werkstoffe, Hartstoffe11420/74610.1016/j.jeurceramsoc.2009.05.02110.15480/882.744930768457Journal Article