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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
Citation Link: https://doi.org/10.15480/882.744
Publikationstyp
Journal Article
Date Issued
2009-06-13
Sprache
English
TORE-DOI
Volume
29
Start Page
3273
End Page
3278
Citation
Journal of the European Ceramic Society 29 (2009) 3273–3278
Publisher DOI
Scopus ID
Publisher
Elsevier
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.
Subjects
KNN-keramik, keramikherstellung, piezokeramik
KNN ceramics, ceramic processing, piezoelectrics
DDC Class
620: Ingenieurwissenschaften
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