| Effect of La on Magnetic Properties of BaFe12O19 |
D. Shekhawat,1,* S. Verma2 and P. Sharma2
Pages : 247-251
DOI : 10.1080/0371750X.2017.1396925 |
| Abstract |
| Among the M-type hexaferrites, barium ferrites (BaFe12O19) have greatest technology
interest due to its low cost and moderate magnetic properties. Magnetic properties
can be tailored by changing processing condition and by suitable cationic
substitution at Ba or Fe site. Lanthanum substituted (Ba1–xLaxFe12O19) and extra
addition of lanthanum (BaFe12O19(Lax)) in barium hexaferrite are successfully
prepared by solid state synthesis method. The structural, magnetic and microstructural
characterizations are studied by X-ray diffractometer (XRD), mössbauer
spectroscopy, vibrating sample magnetometer and scanning electron microscope
(SEM), respectively. XRD patterns show single phase BaFe12O19 for La-substituted
samples, whereas a secondary phase of barium mono-ferrite (BaFe2O4) is also
detected for La-extra addition samples. Crystallite size is found to increase with La
substitution. SEM shows the surface morphology of La-substitution and La-extra
addition BaFe12O19. The magnetic properties show the variation in coercivity (Hc)
and saturation magnetization (Ms) with La substitution and extra addition. Coercivity
is found to decrease abruptly in La-extra addition samples, however, no such
variation is observed for La-substituted samples. Ms is found to decrease for
La-substituted barium hexaferrite, whereas Ms for La-extra addition samples first
decreases and then increases to maximum value.
[Keywords: Barium monoferrite, Barium hexaferrite, Magnetic properties] |
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