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

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Affiliation of Author(s):航空学院

Journal:Ceram Int

Abstract: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 &Delta;RA 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 &Aring;, but stabilize rhombohedral phase of the ones with RA < 1.47 &Aring;. On the other hand, The ANbO3 ceramics without Li+ doping prefer to orthorhombic phase due to indistinctive ionic size differences (&Delta;RA < 0.25 &Aring;). 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. &copy; 2019 Elsevier Ltd and Techna Group S.r.l.

ISSN No.:0272-8842

Translation or Not:no

Date of Publication:2019-11-01

Co-author:Wang, Fangfang,Chen, Xinglong,Dawei Wu,Kongjun Zhu

Correspondence Author:Kang Yan