A comparison of the magnetic characteristics of nanocrystalline nickel, zinc, and manganese ferrites synthesized by reverse micelle technique
A comparison of the magnetic characteristics of nanocrystalline nickel, zinc, and manganese ferrites synthesized by reverse micelle technique
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DOI：
10.1016/j.mseb.2004.04.014
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发表时间：
2004-08-25
期刊：
影响因子：
--
通讯作者：
Egelhoff, WF
中科院分区：
文献类型：
--
作者：
Misra, RDK;Gubbala, S;Egelhoff, WF
采用高分辨透射电子显微镜（HRTEM）和X射线衍射技术对反胶束合成法合成的镍、锌和锰铁氧体纳米晶进行了表征，并利用超导量子干涉仪（SQUID）研究了其磁行为。这三种铁氧体的阻断温度分别为16、20和35 K。阻断温度的差异归因于磁晶各向异性和L-S耦合。三种铁氧体在300 K时的饱和磁化强度分别为25、8和6 emu/g，在2 K时分别为35、17和15 K。较低的饱和磁化强度的情况下，镍和锰铁氧体相比，它们的散装对应物是由于一个核-壳状颗粒形态。在锌铁酸盐纳米颗粒的情况下，饱和磁化强度的增加归因于阳离子分布从正常尖晶石到纳米晶形式的混合尖晶石结构的变化。(C)2004 Elsevier B. V.保留所有权利。
Nanocrystalline nickel, zinc and manganese ferrites synthesized by reverse micelle synthesis technique were characterized by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction techniques, and the magnetic behavior studied by Superconducting Quantum Interference Device (SQUID). The three ferrites exhibit blocking temperatures of 16, 20, and 35 K, respectively. The difference in the blocking temperatures was attributed to the magnetocrystalline anisotropy and L-S coupling. The saturation magnetization of the three ferrites at 300 K was 25, 8, and 6 emu/g, respectively and at 2 K was 35, 17, and 15 K, respectively. The lower saturation magnetization in the case of nickel and manganese ferrite compared to their bulk counterparts is attributed to a core-shell like particle morphology. The increase in the saturation magnetization in the case of zinc ferrite nanoparticles is attributed to the change in the cation distribution from a normal spinel to a mixed spinel structure in the nanocrystalline form. (C) 2004 Elsevier B.V. All rights reserved.