Enhanced resistance in Bi(Fe1-xScx)O3-0.3BaTiO3 lead-free piezoelectric ceramics: Facile analysis and reduction of oxygen vacancy. Issue 14 (November 2019)

• Record Type: Journal Article
• Authors: Xun, Bo-Wei; Tang, Yu-Cheng; Chen, Jian-Yin; Zhang, Bo-Ping
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 14(2019)
• Page Start: 4085
• Page End: 4095
• Publication Date: 2019-11
• Subjects: 0.7BF-0.3BT -- Insulating properties -- Oxygen vacancy -- Piezoelectricity; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.06.015
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: We reported a facile analysis and reduction of oxygen vacancy ( V O ) in 0.7Bi(Fe1- x Sc x )O3 -0.3BaTiO3 (0≤ x ≤0.08) ceramics. The leakage current mechanism was investigated intensively. Our results indicated that oxygen vacancies are the main cause for the high conductivity in BF-BT ceramics, and their concentration was quantitatively estimated from the Bi 3+ content and the average oxidation state of iron. The V O concentration was effectively suppressed and the insulation resistance was enhanced by almost two orders of magnitude after doping 2%mol Sc 3+ . The enhanced insulation resistance contributed to excellent piezoelectric properties with d 33 = 165 pC/N, T C = 505 °C, and k p = 26%. The proposed analysis method used to quantify the V O concentration provides valuable indications to reduce the leakage current density and improve the piezoelectric properties of BF-BT based ceramic.