Li, QL and Chang, CB and Wang, YF (2010) Effect of Doping on Morphology and Properties of Rod-Like Nano-SrFe12O19. CHINESE JOURNAL OF INORGANIC CHEMISTRY . ISSN 1001-4861
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FeCl2 was used for preparing needle-like alpha-FeOOH intermediate by chemical precipitation method. Then the needle-like alpha-FeOOH was enwrapped by the complex of the citrate acid and Sr2+ by citrate acid method. The rodlike nano-SiFe12O19 was obtained after the calcination of enwrapped alpha-FeOOH precursor. La3+ was doped into the nano-SrFe12O19 in the coprecipitation processes and sol-gel processes, respectively. The phase, morphology, particle size, and the magnetic properties of samples were studied by XRD, TEM and vibrating sample magnetometer(VSM). The results show that the rod-like SrFe12O19 with an average diameter of 40 nm and the slenderness ratio of 15 similar to 20 is obtained by the combination of the precipitation method and citrate acid method. It is also found that the rod-like SrLaxFe12-xO19 obtained by La doping in the precipitation process is with smaller particles and higher slenderness ratio, x values higher than that by doping in the sol-gel process, resulting in the increased shape anisotropy and magnetic properties. As x=0.15, the optimum coereivity, saturation magnetization, and residual magnetization for the samples by doping La in the precipitation process are 6179.1Oe, 65.7 and 38.4 emu . g(-1), respectively. As x=0.2, the maximal saturation magnetization for the sample is 67.3 emu . g(-1), and the coercivity is 5852.7 Oe.
|Subjects:||Material Science > Nanochemistry|
|Deposited On:||28 Oct 2010 10:38|
|Last Modified:||28 Oct 2010 10:38|
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