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Effect of high magnetic field annealing on the microstructure and magnetic properties of Co-Fe layered double hydroxide |
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| Authors: | Xiong Zhang Shuxia Zhang Wensheng Yang Satoshi Awaji |
| Affiliation: | a Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, PR China b State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China c High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan |
| Abstract: | The effects of high magnetic field (10 T) on the products obtained by calcination of Co-Fe LDH precursors at different temperatures were investigated. The XRD results indicated that FeIII substituted for CoIII in Co3O4 to yield CoIICoIIIFeIIIO4 under the calcination of Co-Fe LDH precursors at 400 °C. The products obtained by magnetic field annealing at 400 °C had a porous plate-like morphology, whereas the products without magnetic field annealing were composed of nanoparticles. It was seen that CoFe2O4 phase could be formed at low temperature (about 500 °C) under the magnetic field annealing. The grain size of products obtained by magnetic field annealing at 800 °C was larger than that of zero magnetic field. It was found that the saturation magnetization was significantly enhanced after magnetic field annealing, especially at lower temperature (≤600 °C). The possible reason for the effects on the microstructure and magnetic properties of products obtained by magnetic field annealing was discussed. |
| Keywords: | Co-Fe layered double hydroxide CoFe2O4 Magnetic field annealing Magnetic property |
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