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Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

1,2,†, 1,2,†, 1, 1,2,*, 3, 3 and 1,4,*
1
Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology, Guangxi Normal University, Guilin 541004, China
2
College of Medical Informatics, Hainan Medical University, Haikou 571199, China
3
College of Physics and Technology, Guangxi Normal University, Guilin 541004, China
4
Sate Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin 541004, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2018, 11(11), 2095; https://doi.org/10.3390/ma11112095
Received: 18 August 2018 / Revised: 14 October 2018 / Accepted: 23 October 2018 / Published: 25 October 2018
(This article belongs to the Special Issue New Developments in Ferromagnetic Materials)
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Abstract

Cobalt-chromium ferrite, CoCrxFe2−xO4 (x = 01.2), has been synthesized by the sol-gel auto-combustion method. X-ray diffraction (XRD) indicates that samples calcined at 800 °C for 3 h were a single-cubic phase. The lattice parameter decreased with increasing Cr concentration. Scanning electron microscopy (SEM) confirmed that the sample powders were nanoparticles. It was confirmed from the room temperature Mössbauer spectra that transition from the ferrimagnetic state to the superparamagnetic state occurred with the doping of chromium. Both the saturation magnetization and the coercivity decreased with the chromium doping. With a higher annealing temperature, the saturation magnetization increased and the coercivity increased initially and then decreased for CoCr0.2Fe1.8O4. View Full-Text
Keywords: Co-Cr-Ferrite; sol-gel auto-combustion; nanoparticle structure; Mössbauer; superparamagnetic Co-Cr-Ferrite; sol-gel auto-combustion; nanoparticle structure; Mössbauer; superparamagnetic
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Lin, J.; Zhang, J.; Sun, H.; Lin, Q.; Guo, Z.; Yang, H.; He, Y. Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method. Materials 2018, 11, 2095.

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