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Microstructure, Ferroelectric, Piezoelectric, and Ferromagnetic Properties of Sc‐Modified BiFeO 3 – BaTiO 3 Multiferroic Ceramics with MnO 2 Addition
Author(s) -
Wan Yang,
Li Ying,
Li Qiang,
Zhou Wei,
Zheng Qiaoji,
Wu Xiaochun,
Xu Chenggang,
Zhu Benpeng,
Lin Dunmin
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12827
Subject(s) - materials science , curie temperature , sintering , ferroelectricity , ceramic , microstructure , multiferroics , ferromagnetism , ferromagnetic material properties , piezoelectricity , coercivity , atmospheric temperature range , perovskite (structure) , doping , magnetization , composite material , dielectric , condensed matter physics , crystallography , magnetic field , optoelectronics , chemistry , thermodynamics , physics , quantum mechanics
0.725 BiFe 1− x Sc x O 3 –0.275 BaTiO 3 + y mol% MnO 2 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 × 10 9 Ω·cm), strong ferroelectricity ( P r = 19.1–20.4 μm/cm 2 ), good piezoelectric properties ( d 33 = 127–128 pC/N, k p = 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 M r of 0.059 and 0.10 emu/g and coercive field H c 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 T C (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 MnO 2 is essential to obtain the ceramics with good electrical properties and electric insulation.