Magnetization and Mossbauer study of cobalt ferrite particles from nanophase cobalt iron carbonate

被引：118
作者：
Ahn, Y [1 ]
Choi, EJ
Kim, S
Ok, HN
机构：
[1] Konyang Univ, Div Nat Sci, Chungnam 320711, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Chem, Taejon 305701, South Korea
[3] Korea Adv Inst Sci & Technol, Ctr Mol Sci, Taejon 305701, South Korea
[4] Yonsei Univ, Dept Phys, Seoul 120749, South Korea
来源：
MATERIALS LETTERS | 2001年 / 50卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
nanostructures; Mossbauer spectroscopy; magnetic properties; cobalt ferrite;
D O I：
10.1016/S0167-577X(00)00412-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nanosize CoFe2O4 particles prepared by a microemulsion method have been investigated by X-ray diffractometry, transmission electron microscopy. SQUID magnetometry and Mossbauer spectroscopy. All peaks of X-ray diffraction patterns can be attributed to a cubic spinet structure with the lattice constant a(0) = 8.397 Angstrom. The average size of the particles, determined by transmission electron microscopy, is 49 Angstrom. The coercivity and the maximal magnetization measured at 5 K in an applied magnetic field of 50 kOe are 15.1 kOe and 15.2 emu/g, respectively. In the same field of 50 kOe, the measured blocking temperature is about 35 K. Superparamagnetic behavior of these particles around room temperature is confirmed by the coincidence of the magnetization (M) vs. an applied magnetic field (H/T) plots for different temperatures and the Mossbauer spectra. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：47 / 52
页数：6
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