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- Title
The study of CoFe<sub>2</sub>O<sub>4</sub>/Ba<sub>0.85</sub>Ca<sub>0.15</sub>Zr<sub>0.1</sub>Ti<sub>0.9</sub>O<sub>3</sub>-laminated composite ceramic on dielectric, relaxation, ferroelectric, and magnetoelectric coupling properties.
- Authors
Li, Chunyue; Zhou, Chuang; Jang, Yan Gang; Wang, Qi; Huang, Geng; Lin, Yuanhua
- Abstract
In this work, pure Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) and CoFe2O4 (CFO) ceramics were prepared by the sol–gel and co-precipitation method, respectively. Then, the BCZT and CFO were joined to prepare the two-layer CFO/BCZT and three-layer BCZT/CFO/BCZT composite ceramics with the silver epoxy. The influence of the number of layers on the dielectric, relaxation, ferroelectric and magnetoelectric properties of layered composite ceramics was mainly studied. In the dielectric properties test results, both CFO/BCZT and BCZT/CFO/BCZT showed dielectric relaxation properties. Compared with CFO/BCZT, the dielectric constant of BCZT/CFO/BCZT at room temperature can reach about 6000 with lower loss. The Diffusion index (γ) of the composite ceramic samples was fitted by the Curie–Weiss law, indicating that the BCZT/CFO/BCZT diffusion phase transition is more obvious. Next, through complex impedance spectroscopy, an RC equivalent circuit model is set up to analyze the resistance characteristics of the sample. In the Nyquist diagram, the samples exhibit non-Debye relaxation behavior. In addition, the P-E loops indicate that the sample has ferroelectric properties, and the incompletely asymmetrical leakage current curve shows that composites have a built-in electric field. Finally, the dependence of the magnetoelectric coupling coefficient (αME) on the magnetic field and frequency shows that the magnetoelectric coupling performance of the sample has a good frequency tuning ability.
- Subjects
DIELECTRIC relaxation; PHASE transitions; NYQUIST diagram; CURIE-Weiss law; DIELECTRICS; BARIUM titanate; IMPEDANCE spectroscopy
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 25, p20068
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-08824-3