Double hysteresis loops and enhanced mechanical quality factor of Mn-doped 0.75PMN-0.25PT ceramics. Issue 9 (15th June 2020)

• Record Type: Journal Article
• Authors: Cheng, Mingqiang; Fang, Ze; Li, Feng; Zhang, Yongcheng; Qin, Yalin; Wang, Xuduo; Zhang, Kaisheng; Tian, Xue
• Is Part Of: Ceramics international. Volume 46:Issue 9(2020)
• Page Start: 13324
• Page End: 13330
• Publication Date: 2020-06-15
• Subjects: Double hysteresis loop -- Mn-doping -- Mechanical quality factor -- Internal bias field; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.02.111
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Relaxor ferroelectric 0.75 Pb(Mg1/3 Nb2/3 )O3 -0.25PbTiO3 (0.75PMN-0.25PT) ceramics with Mn-doping concentration of 0%, 1%, 2% and 3 mol% were prepared by two-step sintering. The phase composition, microstructure, dielectric property, ferroelectric property, piezoelectric property and electromechanical property were investigated. Results indicate that all ceramics exhibit pure perovskite phases and high density. Mn-doping induces some decrease in dielectric constant ε r, dielectric loss tanδ, remnant polarization P r, piezoelectric coefficient d 33, and electromechanical coupling coefficient k p, while significant increase in mechanical quality factor Q m and the figure of merit (FOM) of 0.75PMN-0.25PT ceramics. For 3 mol% Mn-doped 0.75PMN-0.25PT ceramics, Q m enhances by 1449%, FOM increases by 923%, and tanδ decreases by 67%, which makes it more suitable for high power applications. Interestingly, double P - E loops are observed in 3 mol% Mn-doped 0.75PMN-0.25PT ceramics. The phenomenon was investigated by the symmetry-conforming principle of point defects and the internal bias field.