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Publisher DOI: 10.1016/j.jeurceramsoc.2009.05.021
Title: Investigation of the dielectric and piezoelectric properties of potassiumsodium niobate ceramics close to the phase boundary at (K0.35Na0.65)NbO3 and partial substitutions with lithium and antimony
Language: English
Authors: Mgbemere, Henry Ekene 
Herber, Ralf-Peter 
Schneider, Gerold A. 
Keywords: KNN-keramik, keramikherstellung, piezokeramik;KNN ceramics, ceramic processing, piezoelectrics
Issue Date: 13-Jun-2009
Publisher: Elsevier
Source: Journal of the European Ceramic Society 29 (2009) 3273–3278
Journal or Series Name: Journal of the European Ceramic Society 
Abstract (english): Potassium 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.
DOI: 10.15480/882.744
ISSN: 0955-2219
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: (wissenschaftlicher) Artikel
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