Microstructure,Ferroelectric, Piezoelectric,and Ferromagnetic Properties of Sc‐Modified BiFeO3–BaTiO3 Multiferroic Ceramics with MnO2 Addition |
| |
Authors: | Yang Wan Ying Li Qiang Li Wei Zhou Qiaoji Zheng Xiaochun Wu Chenggang Xu Benpeng Zhu Dunmin Lin |
| |
Affiliation: | 1. College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, , Chengdu, 610066 China;2. School of Optical and Electronic Information, Huazhong University of Science and Technology, , Wuhan, 430074 China |
| |
Abstract: | 0.725BiFe1?xScxO3–0.275BaTiO3 + y mol% MnO2 multiferroic ceramics were fabricated by a conventional ceramic technique and the effects of Sc doping and sintering temperature on microstructure, multiferroic, and piezoelectric properties of the ceramics were studied. The ceramics can be well sintered at the wide low sintering temperature range 930°C–990°C and possess a pure perovskite structure. The ceramics with x/y = 0.01–0.02/1.0 sintered at 960°C possess high resistivity (~2 × 109 Ω·cm), strong ferroelectricity (Pr = 19.1–20.4 μm/cm2), good piezoelectric properties (d33 = 127–128 pC/N, kp = 36.6%–36.9%), and very high Curie temperature (618°C–636°C). The increase in sintering temperature improves the densification, electric insulation, ferroelectric, and piezoelectric properties of the ceramics. A small amount of Sc doping (x ≤ 0.04) and the increase in the sintering temperature significantly enhance the ferromagnetic properties of the ceramics. Improved ferromagnetism with remnant magnetization Mr of 0.059 and 0.10 emu/g and coercive field Hc of 2.51 and 2.76 kOe are obtained in the ceramics with x/y = 0.04/1.0 (sintered at 960°C) and 0.02/1.0 (sintered at 1050°C), respectively. Because of the high TC (636°C), the ceramic with x/y = 0.02/1.0 shows good temperature stability of piezoelectric properties. Our results also show that the addition of MnO2 is essential to obtain the ceramics with good electrical properties and electric insulation. |
| |
Keywords: | |
|
|