TY  - JOUR
AU  - Luo, Huajie
AU  - Tang, Shiyu
AU  - Liu, Hui
AU  - Sun, Zheng
AU  - Gao, Baitao
AU  - Ren, Yang
AU  - Qi, He
AU  - Deng, Shiqing
AU  - Huang, Houbing
AU  - Chen, Jun
PY  - 2022
TI  - Revealing structure behavior behind the piezoelectric performance of prototype lead-free Bi0.5Na0.5TiO3–BaTiO3 under in-situ electric field
JO  - Journal of Materiomics
SN  - 2352-8478
SP  - 1104
EP  - 1112
VL  - 8
IS  - 6
AB  - Bi0.5Na0.5TiO3–BaTiO3 (BNT–100xBT) ceramics are promising candidates for piezoelectric applications. The correlation between their structure and piezoelectric properties has attracted considerable interest. Herein, the structures of 6BT and 7BT with distinct piezoelectricity are investigated via in-situ synchrotron X-ray diffraction and transmission electron microscopy. It is found that although both compositions present morphotropic phase boundary (MPB) features with coexisting R3c and P4bm phases, their refined structures are significantly different. 6BT is composed of the R3c phase with a small P4bm fraction after electrical poling, while 7BT presents comparable fractions of the two phases. Less pronounced structure distortion and oxygen octahedral tilting occur in 7BT, which favor the phase transformation, resulting in an enhanced piezoelectricity. This enhancement driven by structural flexibility is elucidated by phenomenological analysis. These results demonstrate that the design of high piezoelectricity at MPBs should consider not only the phase-coexisting states but also the refined crystal structure.
UR  - https://doi.org/10.1016/j.jmat.2022.07.004
DO  - 10.1016/j.jmat.2022.07.004