Large piezoelectric effect in Bi1/2Na1/2TiO3-based lead-free piezoceramics. Issue 6 (July 2015)

• Record Type: Journal Article
• Authors: Cheng, Renfei; Xu, Zhijun; Chu, Ruiqing; Hao, Jigong; Du, Juan; Ji, Wanbin; Li, Guorong
• Is Part Of: Ceramics international. Volume 41:Issue 6(2015)
• Page Start: 8119
• Page End: 8127
• Publication Date: 2015-07
• Subjects: C. Electrical properties -- Lead-free piezoelectric ceramics -- Bi2FeCrO6-doped; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.03.015
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The 0.935Bi1/2 Na1/2 TiO3 –0.065BaTiO3 –100 x Bi2 FeCrO6 ( x =0–0.013) (BNT–BT–100 x BFCO) lead-free piezoelectric ceramics were fabricated by a conventional solid-state reaction method and the effect of BFCO addition on the microstructure and electrical properties of the ceramics was investigated. All the samples have a relative density higher than 97% of their theoretical values. X-ray diffraction (XRD) patterns show that all compositions have a pure perovskite structure and BFCO effectively diffused into the BNT–BT lattice during sintering to form a solid solution. SEM images indicate that the grain size of BNT–BT ceramics firstly increases and then decreases with the increase of BFCO content, and all the modified ceramics have a clear grain boundary and a uniformly distributed grain size. Appropriate BFCO doping into BNT–BT ceramics induce the enhancement of piezoelectric and ferroelectric properties. Improved P r =42.3 μC/cm 2, low E c of 28.7 kV/cm, and high d 33 =214 pC/N, k p =33% were observed at x =0.007. These results indicate that the modified BNT–BT ceramics might be promising lead-free piezoelectric candidates for practical applications.