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- Title
Structural, electrical, magnetic and optical properties of BaTi1−x(Ni1/2Nb1/2)xO3 ceramics.
- Authors
Li, Sheng; Zhang, Yuanyuan; Zhou, Lisa; Liu, Qingqing; Yang, Jing; Bai, Wei; Tang, Xiaodong
- Abstract
In this work, we have investigated the structural, electrical, magnetic and optical properties of Ni–Nb co-doped BaTiO3 ceramics. The compositions of BaTi1−x(Ni1/2Nb1/2)xO3 (0 ≤ x ≤ 0.1) were prepared through conventional solid-state reaction method. All the samples exhibit a gradual phase transition behavior from the tetragonal to a cubic structure with the increase in the Ni–Nb co-doping concentration. SEM and EDAX characterizations show that the ceramic samples have good crystallinity and uniform doping element Ni–Nb distribution. The temperature dependence of the dielectric constant reveals that Curie temperature gradually decreased with an increase in Ni2+ and Nb5+ concentrations. The ferroelectric studies show these doping samples exhibit a decreasing ferroelectric property with the increasing level of doping. The decrease in Curie temperature and the weakening of ferroelectricity can be attributed to the transformation of the crystal structure from the tetragonal phase to the cubic phase. Magnetic measurements show that the formation of the F-center makes the sample have ferromagnetic order at room temperature. By studying the effects of different Ni–Nb doping concentrations on the ferroelectricity and ferromagnetism of BaTiO3, it was found that among all samples, when the doping concentration x = 0.08, the ceramic samples showed the best multiferroicity. Moreover, the band gap of these samples is significantly reduced due to the introduction of impurity levels. These results indicate the potential application of Ni–Nb co-doped BaTiO3 in multiferroic devices.
- Subjects
MAGNETIC properties; OPTICAL properties; CURIE temperature; PERMITTIVITY; MAGNETIC measurements; FERROELECTRICITY; PIEZOELECTRIC ceramics
- Publication
Journal of Materials Science: Materials in Electronics, 2021, Vol 32, Issue 14, p19519
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-021-06470-9