Synthesis and characterization of high coercivity rare-earth ion doped Sr0.9RE0.1Fe10Al2O19 (RE: Y, La, Ce, Pr, Nd, Sm, and Gd)

► The study reports synthesis and characterization of rare-earth doped Sr0.9RE0.1Fe10Al2O19. ► Synthesis of pure phase rare-earth doped Sr0.9RE0.1Fe10Al2O19 using autocombustion method is reported. ► The coercivity and Curie temperature was found to be rare-earth ion anisotropy dependent. Highest va...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-02, Vol.550, p.198-203
Main Authors: Rai, B.K., Mishra, S.R., Nguyen, V.V., Liu, J.P.
Format: Article
Language:English
Subjects:
Autocombustion
Coercive force
Coercivity
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Curie temperature
Diffraction
Domain effects, magnetization curves, and hysteresis
Doped ferrite
Doping
Exact sciences and technology
Magnetic properties and materials
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Physics
Rare earth metals
Saturation (magnetic)
Scanning electron microscopy
Sr-Ferrite
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Summary:► The study reports synthesis and characterization of rare-earth doped Sr0.9RE0.1Fe10Al2O19. ► Synthesis of pure phase rare-earth doped Sr0.9RE0.1Fe10Al2O19 using autocombustion method is reported. ► The coercivity and Curie temperature was found to be rare-earth ion anisotropy dependent. Highest values of coercivity and Curie temperature was observed for Pr ion doped samples as Pr ions has high anisotropy. ► The magnetization decreased with doping rare-earth ions with decreasing ionic radii. ► The grain size was observed to be rare-earth ion’s ionic radii dependent. Influence of replacing Sr2+ ions by rare-earth ions (RE3+) ions on the structural and magnetic properties of high coercivity (Hc) SrFe10Al2O19 hexaferrite have been investigated using X-ray diffraction, transmission electron microscopy, differential scanning calorimeter, and SQUID. A 73% increase in intrinsic coercivity is observed for Al3+ doped SrFe10Al2O19 as compared to that of pure SrFe12O19. The RE3+ doping brings in further 50% increase in the coercivity to Sr0.9RE0.1FeAll2O19. Overall the Curie temperature of Sr0.9RE0.1Fe10Al2O19 reduced upon RE3+ substitution, however, among rare-earth ions Pr3+ doping showed highest Tc∼620K. Doping SrFe10Al2O19 with RE3+ ions seems to be detrimental to the saturation magnetization but was observed to be favorable to the coercivity enhancement.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2012.09.021