文献类型：期刊文献

英文题名：Preparation, characterization, magnetic property, and Mossbauer spectra of the β-FeOOH nanoparticles modified by nonionic surfactant

作者：Yang, Y. X.[1,4];Liu, M. L.[2];Zhu, H.[1];Chen, Y. R.[1];Mu, G. J.[1];Liu, X. N.[3];Jia, Y. Q.[1]

机构：[1]E China Univ Sci & Technol, Dept Chem Chem & Mol, Coll Engn, Shanghai 200237, Peoples R China;[2]Jilin Univ, Anal Test Ctr, Changchun 130023, Peoples R China;[3]Yangzhou Univ, Anal Test Ctr, Yangzhou 225009, Peoples R China;[4]Nanjing Univ, State Key Lab Coordinat Chem, Nanjing 210093, Peoples R China

年份：2008

卷号：320

期号：21

起止页码：L132

外文期刊名：JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000258395400002)】；

语种：英文

外文关键词：modified beta-FeOOH nanoparticles; microemulsion method; nonionic surfactant; Mossbauer spectrum

摘要：beta-FeOOH nanoparticles have been prepared in a microemulsion system with nonionic surfactant polyoxyethylene(4) nonylphenylether CH(3)(CH(2))(8)C(6)H(4)O(CH(2)OCH(2))(4)H. The powder X-ray diffraction, infrared spectra, and transmission electron microscopic images indicate that the products are 20-30 nm length nanorods with a crystal structure belonging to monoclinic beta-FeOOH and lattice parameters of a = 0.9981, b = 0.2948, c = 1.0485nm and beta = 92.261. The size and shapes of beta-FeOOH nanoparticles can be manipulated by the surfactant. The modified beta-FeOOH nanoparticles are paramagnetic at room temperature and may be antiferromagnetic or weakly ferrimagnetic at lower temperatures. The (57)Fe Mossbauer spectra show that the magnetic structure transforms below 150 K and two kinds of Fe-O octahedra exist in the lattice of the modified beta-FeOOH nanoparticles. The numbers of each kind of Fe-O octahedra are not the same at room temperature or at low temperatures. (C) 2008 Elsevier B.V. All rights reserved.