FABRICATION AND MECHANICAL PROPERTIES OF Na0.5Bi0.5TiO3–BaTiO3 LEAD-FREE PIEZOELECTRIC CERAMICS

• Main Authors: PAN YUSONG, SHEN QIANQIAN, CHEN YAN
• Format: Article
• Language: English
• Published: University of Chemistry and Technology, Prague 2014-03-01
• Series: Ceramics-Silikáty
• Subjects: Na0.5Bi0.5TiO3–BaTiO3; Lead free piezoelectric ceramics; Microstructure; Compressive strength
• Online Access: http://www.ceramics-silikaty.cz/2014/pdf/2014_01_050.pdf

Piezoelectric ceramics with 0.94Na0.5Bi0.5TO3–0.06BaTiO3 compositions were fabricated by solid state mixed oxide method and sintered at different temperatures varying from 1050°C to 1150°C to obtain dense ceramics. Phase analysis using X-ray diffraction showed tetragonal perovskite structure of Na0.5Bi0.5TO3 with no BaTiO3 peak detected. The SEM observation revealed that the crystal grain size of the piezoelectric ceramics is on the nano-size dimensions under all the sintering temperature. The study on the compressive mechanical characteristics showed that the compressive strength of the 0.94Na0.5Bi0.5TO3–0.06BaTiO3 piezoelectric ceramics increases with the rise of sintering temperature and sintering time. The change behavior of the compressive strength with the rise of cold pressure presents increasing firstly and then decreases.