Microstructural and magnetic properties of Pr–BiCo co-substituted M-type Sr–Ca hexaferrites

• Published in: Chinese journal of physics (Taipei) 2018-04, Vol.56 (2), p.674-682
• Main Authors: Yang, Yujie, Shao, Juxiang, Wang, Fanhou, Rehman, Khalid Mehmood Ur, Tang, Jin
• Format: Article
• Language: English
• Subjects: M-type hexaferrites; Magnetic properties; Pr–BiCo co-substitution; X-ray diffraction
• ISSN: 0577-9073
• DOI: 10.1016/j.cjph.2018.02.012

•Sr0.8-xCa0.2PrxFe12.0-x(Bi0.5Co0.5)xO19 hexaferrites were prepared by standard ceramic method.•The hexaferrite grains have a hexagonal platelet shape with clear grain boundaries.•Br first increases and then decreases with increasing Pr–BiCo content (x).•Hcj first decreases and then increases with increasing Pr–BiCo content (x). We have synthesized the Pr–BiCo substituted hexaferrites with compositions of Sr0.8-xCa0.2PrxFe12.0-x(Bi0.5Co0.5)xO19 (0.0 ≤ x ≤ 0.5) by the standard ceramic method. Results of X-ray diffraction analysis exhibits that the synthesized hexaferrites with x from 0.0 to 0.3 are in single magetoplumbite structure, and impurity phases are observed when x ≥ 0.4. The surface morphology of magnets shows that hexaferrite grains have a hexagonal platelet shape with clear grain boundaries. The remanence first increases with x from 0.0 to 0.1, and then decreases when x ≥ 0.1. The intrinsic coercivity decreases with x from 0.0 to 0.1, and then increases when x ≥ 0.1. With x from 0.0 to 0.4, the changing trend of magnetic induction coercivity is in agreement with that of Hcj, while at x ≥ 0.4, Hcb decreases. The maximum energy product initially increases with x from 0.0 to 0.2, and then decreases when x ≥ 0.2.