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1. Effect of cobalt substitution on magnetic properties of Ba4Ni2−xCoxFe36O60 hexaferrite

Author

Xiaona Jiang, Songze Li, Zhong Yu, Vincent G. Harris, Zhijuan Su, Ke Sun, Chuanjian Wu, Rongdi Guo, and Zhongwen Lan

Subjects
Physics, QC1-999
Abstract

Co-substituted U-type hexagonal ferrite bulks, with composition of Ba4Ni2−xCoxFe36O60 (x=0.2, 0.4, 0.6, 0.8), were prepared by a conventional ceramic method. Saturation magnetization (4πMs), coercivity (Hc), and Curie temperature (Tc) were investigated. Anisotropy constant (K1) was calculated by fitting the magnetization curve (M-H) according to the law of approach to saturation, and anisotropy field (Ha) was calculated accordingly. The results reveal that all the samples possess the U-type hexagonal crystallographic structure. With increasing cobalt substitution content (x), the lattice parameters (a and c) almost remain the same owing to the similar radii of Ni2+ (0.72 Å) Co2+ (0.74 Å) ions. 4πMs goes up, while Hc Hc shows an opposite trend. K1 and Ha monotonously decrease resulting from that cobalt substitution weakens the c-axis orientation. Additionally, Tc increases from 467 °C to 484 °C.

Published
2018
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2. Effect of cobalt substitution on magnetic properties of Ba4Ni2−xCoxFe36O60 hexaferrite

Author

Ke Sun, Songze Li, Zhijuan Su, Chuanjian Wu, Zhongwen Lan, Vincent G. Harris, Rongdi Guo, Zhong Yu, and Xiaona Jiang

Subjects
010302 applied physics, Materials science, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, Crystal structure, Coercivity, 021001 nanoscience & nanotechnology, 01 natural sciences, lcsh:QC1-999, Magnetic anisotropy, chemistry, visual_art, 0103 physical sciences, visual_art.visual_art_medium, Curie temperature, Ceramic, 0210 nano-technology, Anisotropy, Cobalt, Saturation (magnetic), lcsh:Physics
Abstract

Co-substituted U-type hexagonal ferrite bulks, with composition of Ba4Ni2−xCoxFe36O60 (x=0.2, 0.4, 0.6, 0.8), were prepared by a conventional ceramic method. Saturation magnetization (4πMs), coercivity (Hc), and Curie temperature (Tc) were investigated. Anisotropy constant (K1) was calculated by fitting the magnetization curve (M-H) according to the law of approach to saturation, and anisotropy field (Ha) was calculated accordingly. The results reveal that all the samples possess the U-type hexagonal crystallographic structure. With increasing cobalt substitution content (x), the lattice parameters (a and c) almost remain the same owing to the similar radii of Ni2+ (0.72 A) Co2+ (0.74 A) ions. 4πMs goes up, while Hc Hc shows an opposite trend. K1 and Ha monotonously decrease resulting from that cobalt substitution weakens the c-axis orientation. Additionally, Tc increases from 467 °C to 484 °C.

Published
2018

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