Article

Hyperfine Interactions

, Volume 219, Issue 1, pp 41-48

First online:

Effect of Co 2 +  content on the magnetic properties of Co x Fe 3 − x O 4 /SiO 2 nanocomposites

  • J. HuaAffiliated withKey Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal UniversityState Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University
  • , M. LiuAffiliated withKey Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University
  • , L. WangAffiliated withKey Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University
  • , S. C. XuAffiliated withKey Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University
  • , M. FengAffiliated withKey Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University
  • , H. B. LiAffiliated withKey Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal UniversityState Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University Email author 

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

Non-stoichiometric CoxFe3 − xO4/SiO2 (x = 0.8, 0.9, 1.0, 1.1) nanocomposites have been prepared by sol-gel method. The structure, morphology and magnetic properties of the obtained samples were characterized by X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer and Mössbauer spectroscopy at room temperature. As the Co2 +  content increases, the average particle size of the spherical CoxFe3 − xO4 in the samples decreases and the lattice constants increases. The hyperfine fields for both A- and B-site decrease, while the fraction of Co2 +  occupying the A-site increases. Magnetization measurements show the saturation magnetization and coercivity of CoxFe3 − xO4/SiO2 decrease with increasing Co2 +  content. The decrease in magnetization results from the weakened A-B interactions between Fe3 + , and the change in coercivity can be related to the variation of Co2 +  at B-site and the decreasing particle size.

Keywords

Sol-gel method Nanocomposites Mössbauer spectroscopy Magnetic properties