Chin. Phys. Lett.  2001, Vol. 18 Issue (5): 692-694    DOI:
Original Articles |
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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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.
Keywords: 81.05.-t      81.20.-n      81.40.-z     
Published: 01 May 2001
PACS:  81.05.-t (Specific materials: fabrication, treatment, testing, and analysis)  
  81.20.-n (Methods of materials synthesis and materials processing)  
  81.40.-z (Treatment of materials and its effects on microstructure, nanostructure, And properties)  
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XIONG Gang
MAI Zhen-Hong
WANG Chao-Ying
NI Yong-Ming
ZHAO Zhong-Xian
XU Ming
LIU Cui-Xiu
LUO Guang-Ming
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