Influence of BaTiO3 on Synthesis and Structure of Lead-Free Ceramics Based on KNN

Proceedings of the 21st IEEE International Symposium on Applications of Ferroelectrics held jointly with 11th IEEE European Conference on the Applications of Polar Dielectrics and IEEE PFM (ISAF/ECAPD/PFM 2012) 2012
Ilze Smeltere, Maija Antonova, Anna Kalvāne, Maris Livinsh, Andris Sternberg, Barbara Garbarz-Glos

In the present work lead-free compositions with a stoichiometric formula (1-x)(K0.5Na0.5)Nb1-ySbyO3-xBaTiO3 (x=0.01, 0.02, 0.04; y=0.04, 0.07) were produced by solid state sintering method. Manganese oxide MnO2 was used as a dopant in order to lower the sintering temperatures. The influence of BaTiO3 on the microstructure, density, mechanical and electrical properties Of Sb-substituted KNN ceramics was investigated. X-ray diffraction analysis revieled pure perovskite structure. Microstructural investigation of the ceramics samples showed homogeneous structure with a slightly rounded cubical grain shape. Phase transition temperature Tc is shifted to lower temperatures in comparison to Sb-substituted KNN ceramics. Phase transition peak at Tc becomes broader indicating the diffuse phase transition.

Keywords
Lead-free ceramics; Sintering; Microstructure; Electrical properties
DOI
10.1109/ISAF.2012.6297778
Hyperlink
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6297778

Smeltere, I., Antonova, M., Kalvane, A., Livinsh, M., Sternberg, A., Garbarz-Glos, B. Influence of BaTiO3 on Synthesis and Structure of Lead-Free Ceramics Based on KNN. In: Proceedings of the 21st IEEE International Symposium on Applications of Ferroelectrics held jointly with 11th IEEE European Conference on the Applications of Polar Dielectrics and IEEE PFM (ISAF/ECAPD/PFM 2012), Portugal, Aveiro, 9-13 July, 2012. Piscataway: IEEE, 2012, pp.1-4. ISBN 978-1-4673-2668-1. Available from: doi:10.1109/ISAF.2012.6297778

Publication language
English (en)