The effect of artificial stress on structure, electrical and mechanical properties of Sr2+ doped BNT–BT lead-free piezoceramics

• Published in: Journal of materials science. Materials in electronics 2019-12, Vol.30 (24), p.21398-21405
• Main Authors: Li, Chenwan, Yang, Ling, Xu, Jiwen, Yuan, Changlai, Zhou, Changrong, Wang, Hua
• Format: Article
• Language: English
• Subjects: Anomalies; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coercivity; Doping; Dynamic mechanical analysis; Grain growth; Grain size; Lead free; Materials Science; Mechanical properties; Optical and Electronic Materials; Phase transitions; Piezoelectric ceramics; Piezoelectricity; Size effects; Solid phases
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-019-02518-z

The effect of Sr 2+ doping on the microstructural, electrical and mechanical properties of 0.93(Bi 0.5 Na 0.5 )TiO 3 –0.07BaTiO 3 ceramics was investigated. The X-ray diffraction and Raman results show the phase transition from tetragonal phase to rhombohedral phase induced by Sr 2+ ions. The Sr 2+ doping promotes grain growth, but refines grains with Sr 2+ content continuously increasing. Three dielectric anomalies at T d , T p and T m are obvious, and T d is seriously affected by Sr 2+ content. The T d peak is confirmed by the T 1 peak at dynamic mechanical analysis. The coercive field ( E c ) and remnant polarization ( P r ) are modified by grain size effect and phase structure induced by Sr 2+ doping. The piezoelectric coefficient can be effectively improved by Sr 2+ doping.