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Lead-free BNT-based composite materials: enhanced depolarization temperature and electromechanical behavior


It is an intractable issue to develop (Bi0.5Na0.5)TiO3-based solid solution with both high depolarization temperature Td and excellent piezoelectric and electromechanical properties for practical application because the improved thermal stability was usually accompanied by the deterioration of piezoelectric and electromechanical performance. Here, we report the 0-3 type 0.93(Bi0.5Na0.5)TiO3-0.07BaTiO3:30mol%ZnO composite (BNT-7BT:0.3ZnO) to resolve the above long-standing obstacle, where ZnO nanoparticles exhibited two existence form that partial Zn ions have filled in the boundaries of BNT-7BT grains and residual Zn ions have diffused into the BNT-7BT lattice, as confirmed by XRD, Raman and microstructure analysis. Forming the composite ceramics with 0-3 type connectivity produced the enhancement of frequency-dependence of electromechanical properties, fatigue characteristic, and thermal stability in BNT-7BT ceramics. More importantly, there is a low poling field-driven large piezoelectric properties for composite ceramics as compared to pure BNT-7BT solid solution. A mechanism related to the ZnO-driven phase transition from the rhombohedral to tetragonal phase and built-in electric field to partially compensate the depolarization field is proposed to explain the achieved outstanding piezoelectric performance. It is the first time for BNT-based ceramics to simultaneously optimize thermal stability, electromechanical behavior and low poling field-driven high piezoelectric performance. As a result, our study provides a referential methodology to achieve novel piezoceramics with excellent piezoelectricity by composite engineering and opens up a new development window for utilization of conventional BNT-based and other lead-free ceramics in practical applications.

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Publication details

The article was received on 02 Aug 2017, accepted on 12 Oct 2017 and first published on 12 Oct 2017

Article type: Paper
DOI: 10.1039/C7DT02846F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Lead-free BNT-based composite materials: enhanced depolarization temperature and electromechanical behavior

    W. Bai, P. Zheng, F. Wen, J. Zhang, D. Chen, J. Zhai and Z. Ji, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02846F

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