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- Title
Fe doping effect on the structural, ferroelectric and magnetic properties of polycrystalline BaTi<sub>1−x</sub>Fe<sub>x</sub>O<sub>3</sub> ceramics.
- Authors
Zhou, Lisa; Zhang, Yuanyuan; Li, Sheng; Lian, Qin; Yang, Jing; Bai, Wei; Tang, Xiaodong
- Abstract
BaTi1−xFexO3 (x = 0–0.08) ceramics were prepared by conventional solid-state reaction. The Fe doping effect on the structure, electrical and magnetic properties was analyzed. The Fe substitution would reduce the degree of tetragonality and ferroelectricity. The hexagonal phase began to emerge and increased after x = 0.04 by the X-ray diffraction. Meanwhile, ferroelectricity is diminished due to an increase of the non-ferroelectric hexagonal and pinning of domain wall motioned by oxygen vacancies with the increasing Fe substitution. It is found that the nonlinear change of magnetic properties with the increasing Fe concentration. The critical role of the valence state of Fe ions and the accompanied oxygen vacancies on the magnitude of magnetic properties is discussed. Our investigations suggest that the competition of Fe4+–O2−–Fe4+, Fe3+–O2−–Fe4+ and Fe3+–O2−–Fe3+ interaction are coexisted, and the Fe4+–O2−–Fe4+ super-exchange interaction is responsible for the larger magnetism at x = 0.04. From the analyze of XPS spectra, the higher content of Fe4+ and lower oxygen vacancies at x = 0.04 verify that Fe4+–O2−–Fe4+ super-exchange interaction is the origin of larger magnetism.
- Subjects
MAGNETIC properties; DOMAIN walls (String models); CERAMICS; MAGNETISM; FERROELECTRICITY; DIELECTRIC properties; FERROELECTRIC ceramics
- Publication
Journal of Materials Science: Materials in Electronics, 2020, Vol 31, Issue 17, p14487
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-020-04008-z