期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 490, 期 1-2, 页码 301-306出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.09.182
关键词
Nanocrystalline NiFe2-xSmxO4 fiber; Organic gel-thermal decomposition method; Sm3+ ions doping; Magnetic property
资金
- National Natural Science Foundation of China [50674048, 50474038]
- China Postdoctoral Science Foundation [20080431069]
The nanocrystalline NiFe2-xSmxO4 (x=0, 0.05, 0.10, 0.15) fibers with diameters 0.5-2 mu m have been prepared using the organic gel-thermal decomposition method. The composition, morphology and structure of the gel precursors and NiFe2-xSmxO4 fibers derived from calcination of these precursors were characterized by FTIR, XRD and SEM. The thermal decomposition of the gel precursors was investigated by TG-DSC and the magnetic properties of the as-prepared fibers were examined using vibrating sample magnetometer (VSM). The results show that the Sm3+ ions doping has not resulted in crystal structural changes of the Ni ferrite spinet structure and all the ferrite fibers obtained are characterized with a simple spinet phase. The crystalline grain sizes of the NiFe2-xSmxO4 fibers are influenced by the calcination temperature and Sm contents. The crystalline grain sizes of the simple NiFe2O4 fibers increase from about 18.9 nm to 45.1 nm corresponding the calcination temperature from 550 degrees C to 800 degrees C, while the crystalline grain sizes of the NiFe2-xSmxO4 fibers obtained at 800 degrees C reduce from 45.1 nm (x=0) to 14.0 nm (x=0.15). The lattice parameters of the grains building the NiFe2-xSmxO4 fibers become large with the Sm3+ ions doping owing to larger Sm3+ ions substitution of Fe3+ ions. The saturation magnetization is decreased by addition Of Sm3+ ions while increased with the crystalline grain sizes. The coercivity is very small for the NiFe2-xSmxO4 fibers with a high Sm3+ ions doping level (x=0.15) at calcination temperature of 550 degrees C and increased with the reduction of Sm contents and increase of the calcination temperature. (C) 2009 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据