Effect of CaCu₃Ti₄O₁₂ modification on the structural, electrical and magnetic properties of BiFeO₃ ceramics

ABSTRACT

The polycrystalline samples of (1−x)BiFeO₃-xCaCu₃Ti₄O₁₂ (x = 0, 0.05, 0.10 and 0.15) were synthesized by solid state reaction method followed by rapid liquid phase sintering. The effects of CaCu₃Ti₄O₁₂ (CCTO) doping on the microstructure, dielectric and magnetic properties of BiFeO₃ (BFO) ceramics were studied by changing CCTO concentrations. The XRD analysis reveals that that a little amount of CCTO as a solid solution in the BFO phase leads to expanding the lattice, no phase transition has occurred in the doping content range, but CCTO doping induces the crystal structure distortion. Impedance spectroscopy results show that the doped BFO ceramics have a broadband stability of the dielectric constant and dielectric loss on frequency, the CCTO doping can improve the dielectric constant and reduce dielectric loss of BFO. It is also observed that an increase in CCTO doping concentration in BFO can improve the magnetic properties of BFO.

KEYWORDS:

• (1−x)BiFeO₃-xCaCu₃Ti₄O₁₂
• dielectric properties
• magnetic properties

Funding

This work is supported by the National Natural Science Foundation of China (No. 11305142), Key Members of the Outstanding Young Teacher of Zhengzhou University of Light Industry and Henan Province (No. 2015GGJS-185), and Foundation of Zhengzhou University of Light Industry (No. 2014XJJ010).