Journal
RARE METALS
Volume 28, Issue 2, Pages 151-155Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-009-0030-6
Keywords
ceramic fibers; Mn-Zn ferrite; thermal decomposition; magnetic properties; Ce3+-doped
Funding
- National Natural Science Foundation of China [50674048]
- Avigation Science Foundation of China [2007ZF52062]
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Ce3+-doped Mn-Zn ferrite fibers were successfully prepared by the organic gel-thermal decomposition method from metal salts and citric acid. The composition, structure, and magnetic properties of these ferrite fibers were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The results show that Mn0.2Zn0.8Fe2-x Ce (x) O-4 (x = 0-0.04) fibers are featured with an average grain size of 11.6-12.7 nm, with diameters ranging between 1.0 to 3.5 mu m and a high aspect ratio (length/diameter). The Ce3+ ion doping has not resulted in crystal structural changes of the Mn-Zn ferrite phase and all the as-prepared ferrite fibers have a simple spinel phase structure, although this influences the morphologies of Mn0.2Zn0.8Fe2-x Ce (x) O-4 ferrite fibers possibly owing to the lattice distortion and internal-stress. Both the lattice constant and grain size increase slightly with the increase of the Ce3+ ion doping content. The soft magnetic properties of Mn-Zn ferrite fibers can be improved by a small amount of Ce3+ ion doping with an increase of the saturated magnetization and a decrease of the coercivity.
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