Structural and magnetic studies of Mg substituted cobalt composite oxide catalyst Co1-xMgxFe2O4

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:469

Article

Lin, Qing^1,2  He, Yun¹  Lin, Jinpei¹  Yang, Fang²  Wang, Liping^3,4  Dong, Jianghui^3,4 

[1] Guangxi Normal Univ, Coll Phys & Technol, Guangxi Key Lab Nucl Phys & Nucl Technol, Guilin 541004, Peoples R China

[2] Hainan Med Univ, Coll Med Informat, Haikou 571199, Hainan, Peoples R China

[3] Ningbo 6 Hosp, Dept Hand Surg, Dept Plast Reconstruct Surg, Ningbo 315040, Zhejiang, Peoples R China

[4] Univ South Australia, Sch Pharm & Med Sci, Adelaide, SA 5001, Australia

关键词: Ferrites;    Sol-gel;    Structure;    Magnetic properties;    Mossbauer spectra;   

DOI  :  10.1016/j.jmmm.2018.08.050

来源: Elsevier

【 摘 要 】

The article synthesized the Co1-xMgxFe2O4 sample of single phase spinel structure with sol-gel auto-combustion. The lattice parameter increases, the X-ray density and average crystal sized decrease with an increase in the Magnesium content. The average crystallite size increases with an increase in the calcinating temperature. The ferrimagnetic behaviour of all samples is confirmed by room temperature Mossbauer spectra, and the magnetic hyperfine field decrease with an increase in Mg substitution, which can be attributed to the decrease of the A-B super-exchange interaction. The calcining temperature influences the magnetic hyperfine field and the distribution of Fe3+ ions at the tetrahedral A site and the octahedral B site. The saturation magnetization and coercivity have significant change with increasing Mg2+ ions, the decrease in the coercivity suggests that the sample towards soft magnetic material transformation. Magnesium substituted for Cobalt both having preference to occupy B sites (octahedral sites) reduces. Besides that increased particle size with Mg substitution causes increased distance, and reduces magnetic moment of the B sublattice.

【 授权许可】

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