Effects of A-site ionic size on the phase transition behavior of lead-free niobate ceramics

Add time:07/26/2019    Source:sciencedirect.com

Understanding the phase structure evolution is important for developing high performance lead-free piezoelectric materials. In this work, the effects of A-site ionic size of monovalent ions on the phase transition behaviors for the lead-free niobate ceramics ANbO3 (A = Li, Na, Ag, and K) are investigated using XRD analysis and dielectric measurement. The iso-valent ionic doping restrains the relaxation behavior that usually appears in the hetero-valent ionic-doped niobate ceramics. The A-site average ionic size of RA and its ionic radius differences of ΔRA are found to be crucial influence factors on the phase transition behaviors of the ANbO3 ceramics. Small Li+ doping stabilize tetragonal phase of the ANbO3 ceramics with RA > 1.47 Å, but stabilize rhombohedral phase of the ones with RA < 1.47 Å. On the other hand, The ANbO3 ceramics without Li+ doping prefer to orthorhombic phase due to indistinctive ionic size differences (ΔRA < 0.25 Å). Our results suggest that a certain phase and phase transition boundary could be designed by appropriate ionic doping for developing the niobate-based lead free piezoelectric ceramics.

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