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Effect of Li addition on phase formation behavior and electrical properties of (K0.5Na0.5)NbO3 lead free ceramics |
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| Authors: | Supattra Wongsaenmai Supon AnantaRattikorn Yimnirun |
| Affiliation: | a Program in Materials Science, Faculty of Science, Maejo University, Chiang Mai, Thailand b Department of Physics & Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand c School of Physics, Institute of Science, Suranaree University of Technology, and Synchrotron Light Research Institute, Nakhon Ratchasima, Thailand |
| Abstract: | In this work, Li-modified KNN ceramic compositions ((K0.5Na0.5)1−xLix)NbO3 with x = 0.03, 0.04, 0.05, 0.06, 0.65 and 0.07 were prepared by a conventional solid-state mixed-oxide method. The structural phase formation and microstructure were characterized by X-ray diffraction technique (XRD) and scanning electron microscopy (SEM). It has been found that a morphotropic phase boundary (MPB) between orthorhombic phase and tetragonal phases should exist between compositions with Li contents of 6-6.5%. The Curie temperature (Tc) of the ceramics shifted to higher temperature with increasing Li content. The room temperature dielectric constant was also seen to be higher than the pure KNN ceramics. In addition, the ferroelectric properties were found to enhance at near MPB compositions. This study clearly showed that the addition of Li could improve the dielectric and ferroelectric properties in (K0.5Na0.5)NbO3 ceramics. |
| Keywords: | C Dielectric properties C Ferroelectric properties Li-modified KNN |
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