Synthesis, crystal structure and magnetic characterization of Pr3+ and Zn2+ ions co-doped hexagonal ferrites via the ceramic process

• Published in: Chinese journal of physics (Taipei) 2018-10, Vol.56 (5), p.2075-2084
• Main Authors: Yang, Yujie, Shao, Juxiang, Wang, Fanhou, Huang, Duohui, Wu, Zhen
• Format: Article
• Language: English
• Subjects: Ceramic process; M-type hexaferrites; Magnetic properties; Pr–Zn substitution; X-ray diffraction
• ISSN: 0577-9073
• DOI: 10.1016/j.cjph.2018.07.011

•Hexaferrites Ca0.2Sr0.8-xPrxFe12-yZnyO19 (x = 0.00–0.40, y = 0.00–0.30) were prepared by the ceramic process.•Single M-type hexaferrite phase is obtained in all Pr–Zn doped hexaferrites.•Ms, Mr and Mr/Ms ratio reach to the maximum values at x = 0.24, y = 0.18.•Ha, Keff and Hc reach to the maximum values at x = 0.16, y = 0.12. M-type hexaferrites Ca0.2Sr0.8-xPrxFe12-yZnyO19 (0.00 ≤ x ≤ 0.40, 0.00 ≤ y ≤ 0.30) were synthesized by the ceramic process. The X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and a vibrating sample magnetometer (VSM) were used to investigate microstructure and magnetic properties of the M-type hexaferrites. The single-phase with hexagonal structure was obtained in all Pr–Zn substituted M-type hexaferrites, and with increasing Pr–Zn content, the 2θ values of (107) and (114) peaks shifted towards higher angles. With increasing Pr–Zn content, the lattice constant a basically kept unchanged, while the lattice constant c decreased. FESEM images of the hexaferrites showed that the hexagonal platelets had formed in the hexaferrites and the average grain size increased with increasing Pr–Zn content. The saturation magnetization (Ms), remanent magnetization (Mr) and Mr/Ms ratio first increased with increasing Pr–Zn content (0.00 ≤ x ≤ 0.24, 0.00 ≤ y ≤ 0.18), and then decreased with further increasing Pr–Zn content. The coercivity (Hc), magnetic anisotropy field (Ha) and effective magnetic anisotropy constant (Keff) increased with increasing Pr–Zn content (0.00 ≤ x ≤ 0.16, 0.00 ≤ y ≤ 0.12), and then decreased with further increasing Pr–Zn content.