| Original Articles |
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Characterization of CoCrFeO4 Nanocrystals Prepared
by a Sol-Gel Method |
| XIONG Gang;MAI Zhen-Hong;WANG Chao-Ying;NI Yong-Ming;ZHAO Zhong-Xian;XU Ming;LIU Cui-Xiu;LUO Guang-Ming |
| Institute of Physics and Centre for Condensed Matter Physics,
Chinese Academy of Sciences, Beijing 100080
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| Cite this article: |
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XIONG Gang, MAI Zhen-Hong, WANG Chao-Ying et al 2001 Chin. Phys. Lett. 18 692-694 |
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Abstract CoCrFeO4 nanocrystals have been synthesized using a sol-gel method. The specimen has an average grain size of 8.1 nm. The zero-field-cooled and field-cooled curves show a superparamagnetic transition occurring at a blocking temperature of TB ≈ 249 K. The increase in coercivity of CoCrFeO4 nanocrystals with the decreasing temperature has been detected below the blocking temperature and could be explained by the Stoner-Wohlfarth theory. The temperature dependence of saturation magnetization shows that Bloch's law holds but with the Bloch exponent lower than the bulk value.
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| Keywords:
81.05.-t
81.20.-n
81.40.-z
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Published: 01 May 2001
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| PACS: |
81.05.-t
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(Specific materials: fabrication, treatment, testing, and analysis)
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81.20.-n
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(Methods of materials synthesis and materials processing)
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81.40.-z
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(Treatment of materials and its effects on microstructure, nanostructure, And properties)
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