Abstract
Phase boundaries and composition design were explored to achieve both high piezoelectricity and favorable temperature stability in potassium-sodium niobate ceramics, using (1-x)(K,Na)(Nb,Sb)O3-xBi(Na,K)(Zr,Sn,Hf)O3 ceramics. A rhombohedral-tetragonal (R-T) phase boundary was constructed at x=0.035-0.04 by co-doping with Sb5+ and Bi(Na,K)(Zr,Sn,Hf)O3. More importantly, a superior temperature stability was observed in the ceramics with x=0.035, accompanying with a stable unipolar strain at room temperature to 100 °C. The ceramics with x=0.035 also exhibited improved piezoelectric properties (e.g., piezoelectric coefficient d33~465 pC/N and electromechanical coupling factor kp=0.47) and Curie temperature (Tc~240 °C). The Rietveld refinement and in-situ temperature-dependent piezoresponse force microscopy (PFM) results indicated that the enhancement of the piezoelectric properties was caused by the easy domain switching, high tetragonal fraction, and tetragonality, while the improved temperature stability mainly originated from the stable domain structures.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 305-315 |
| Number of pages | 11 |
| Journal | Journal of the European Ceramic Society |
| Volume | 39 |
| Issue number | 2-3 |
| DOIs | |
| State | Published - Aug 25 2018 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledgements: This work is finished with the supporting of the National Natural Science Foundation of China (NSFC Nos. 51722208 and 51332003), the Key Technologies Research and Development Program of Sichuan Province (No. 2018JY0007) and the Graduate Student’s Research and Innovation Fund of Sichuan University (Nos. 2012017yjsy111, 2018YJSY009 and 2018YJSY071). The authors thank Mrs. Hui Wang (Analytical & Testing Center of Sichuan University) for measuring the FE-SEM images.