Phase Transition and Structural Analysis of (Li,Na,K)NbO3 Lead-Free Piezoelectric Ceramics
Structural characterization of various (Li,Na,K)NbO3 solid solutions with different Li contents has been carried out by temperature-variable Raman scattering measurement. It was found that there was no clear thermal hysteresis between orthorhombic-tetragonal phase transition in the heating/cooling processes for (Li,Na,K)NbO3 ceramics with Li content of 6 wt% and above, although a noticeable thermal hysteresis is observed in the Raman spectra and dielectric constant measurement for the other specimens with lower Li contents. It is presumed that the structural change of (Li,Na,K)NbO3 cell tends to become insensibility against temperature as the Li content increases above 6.0 mol%.
Tadashi Takenaka, Hajime Haneda, Kazumi Kato, Masasuke Takata and Kazuo Shinozaki
K. Kakimoto et al., "Phase Transition and Structural Analysis of (Li,Na,K)NbO3 Lead-Free Piezoelectric Ceramics", Key Engineering Materials, Vols. 421-422, pp. 3-8, 2010