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CoFe2O4纳米颗粒的结构、磁性以及离子迁移

王 丽 王海波 王 涛 李发伸

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CoFe2O4纳米颗粒的结构、磁性以及离子迁移

王 丽, 王海波, 王 涛, 李发伸

Structure, magnetic properties and atomic immigration of CoFe2O4 nanoparticles

Wang Li, Wang Hai-Bo, Wang Tao, Li Fa-Shen
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  • 聚乙烯醇(PVA)溶胶凝胶法制备出CoFe2O4纳米微粉,用X射线衍射研究了铁氧体纳米颗粒的结构.测量了CoFe2O4纳米颗粒80—873 K的变温穆斯堡尔谱,发现纳米颗粒的磁转变温度范围为793—813 K,比块体材料的磁性转变温度要低.CoFe2O4纳米颗粒的德拜温度θA=674 K,θB=243 K,比块体材料要小.CoFe2O4纳米颗粒超精细场Hf随温度的变化符合T3/2+T5/2定理.当温度较高时,平均同质异能移IS随温度的升高而减小,并呈线性关系.
    CoFe2O4 nanoparticles have been prepared by sol-gel method. M?ssbauer spectra at temperature varying from 80 to 873 K showed that the atomic site preference of nanoparticles is different from that of the bulk material. The results also showed that the Tc of nanosized CoFe2O4 is much lower than that of the bulk counterpart. This decrease of Tc in the nanoparticles may be attributed to the redistribution of Fe and Co cations at the A and B sites. The M?ssbauer spectra also revealed that the hyperfine field varied with the temperature and the hyperfine interaction follows T3/2+T5/2 law approximately. The average isomer shift decreases almost linearly with increasing temperature.
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出版历程
  • 收稿日期:  2005-12-08
  • 修回日期:  2006-08-15
  • 刊出日期:  2006-06-05

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