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Dielectric and multiferroic properties of 0.8BaTiO3-0.2BiAlO3/Co0.8Cu0.2Fe2O4 composite ceramics
- Source :
- Journal of Materials Science: Materials in Electronics. 31:13730-13745
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- 0.8BaTiO3-0.2BiAlO3/Co0.8Cu0.2Fe2O4 composite ceramics with a molar ratio of 6:1 were prepared by hydrothermal method combined with solid-state method, and effects of the sintered temperature and time on the microstructure, dielectric, ferroelectric, and magnetic properties were investigated. XRD result indicates that the composite ceramics show bi-phase structure, and the secondary phase is indexed as Ba3Fe32O51, and proves that we can change the sintered temperature and sintered time to adjust the crystallinity of the composite ceramics and the concentration of impurities. The surface is relatively uniform except for few pores, and the grain size of ferromagnetic phase increases as the function of temperature and time. The dielectric dispersion of composite ceramics is obtained, and the character comes from inhomogeneous structure and Maxwell–Wagner type interfacial polarization. The two peaks of dielectric constant are obtained, and the composite ceramics (1200 °C/4 h) show high dielectric constant and loss due to the interface effect, and this result is confirmed by the AC conductively. The relaxation result is different from the ferroelectric phase, and this may be caused by the thermally activated, the grain size of ferroelectric phase, impurity phase, pore, and defect of composite ceramics. The ferromagnetic result refers that the sintered temperature has obvious influence on the coercive force by the grain size and magnetic anisotropy.
- Subjects :
- 010302 applied physics
Materials science
Composite number
Dielectric
Coercivity
Condensed Matter Physics
Microstructure
01 natural sciences
Ferroelectricity
Atomic and Molecular Physics, and Optics
Grain size
Electronic, Optical and Magnetic Materials
visual_art
0103 physical sciences
visual_art.visual_art_medium
Ceramic
Electrical and Electronic Engineering
Composite material
High-κ dielectric
Subjects
Details
- ISSN :
- 1573482X and 09574522
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Science: Materials in Electronics
- Accession number :
- edsair.doi...........efcf02cb8b31fa474bf6498f9968eb9d