Magnetic properties of Ba4Co2Fe36O60 nanocrystals prepared through a sol-gel method
作者： Gang Xiong , Ming Xu , Zhenhong Mai
DOI: 10.1016/S0038-1098(01)00031-X
关键词: Particle 、 Superparamagnetism 、 Analytical chemistry 、 Coercivity 、 Nanocrystalline material 、 Mineralogy 、 Single domain 、 Materials science 、 Magnetization 、 Particle size 、 Grain size
摘要: Ba4CO2Fe36O60 (Co-2-U) nanocrystals were synthesized through a stearic acid sol-gel method. The reaction temperatures dramatically lower than those prepared the conventional ceramic nanocrystalline powders obtained at 750 degreesC approximately spherical in shape with grain sizes ranging from 10 to 25 nm and became cubic-like when heat-treatment temperature was increased. surface composition of Ba4Co2Fe36O60 found be different that bulk counterpart material, exhibiting higher content Ba Co. magnetic properties these samples are clearly size-dependent. specific saturation magnetization is decreases size D. This phenomenon explained by assuming existence nonmagnetic layer on particles. coercivity reaches maximum particle equal 80 then notably as further reduced. These results attributed superparamagnetic effects random distribution single domain ferromagnetic (C) 2001 Elsevier Science Ltd. All rights reserved.
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Y. Wang, Nonlinear optical properties of nanometer-sized semiconductor clusters Accounts of Chemical Research. ,vol. 24, pp. 133- 139 ,(1991) , 10.1021/AR00005A002
G. Whitesides, J. Mathias, C. Seto, Molecular self-assembly and nanochemistry: a chemical strategy for the synthesis of nanostructures. Science. ,vol. 254, pp. 1312- 1319 ,(1991) , 10.1126/SCIENCE.1962191
L. S. Birks, H. Friedman, Particle Size Determination from X‐Ray Line Broadening Journal of Applied Physics. ,vol. 17, pp. 687- 692 ,(1946) , 10.1063/1.1707771
V.V. Pankov, M. Pernet, P. Germi, P. Mollard, Fine hexaferrite particles for perpendicular recording prepared by the coprecipitation method in the presence of an inert component Journal of Magnetism and Magnetic Materials. ,vol. 120, pp. 69- 72 ,(1993) , 10.1016/0304-8853(93)91289-J
B. X. Gu, Magnetic properties of X‐type Ba2Me2Fe28O46 (Me=Fe, Co, and Mn) hexagonal ferrites Journal of Applied Physics. ,vol. 71, pp. 5103- 5106 ,(1992) , 10.1063/1.350613
V.K. Sankaranarayanan, Q.A. Pankhurst, D.P.E. Dickson, C.E. Johnson, Ultrafine particles of barium ferrite from a citrate precursor Journal of Magnetism and Magnetic Materials. ,vol. 120, pp. 73- 75 ,(1993) , 10.1016/0304-8853(93)91290-N
Yingjian Chen, David E. Laughlin, Xiaoding Ma, Mark H. Kryder, Influence of Ba content on grain size and dynamics of crystallization in barium ferrite thin films Journal of Applied Physics. ,vol. 81, pp. 4380- 4382 ,(1997) , 10.1063/1.364830
A. Srivastava, P. Singh, M. P. Gupta, Barium ferrite: preparation by liquid mix technique and its characterization Journal of Materials Science. ,vol. 22, pp. 1489- 1494 ,(1987) , 10.1007/BF01233152
J. P. Chen, C. M. Sorensen, K. J. Klabunde, G. C. Hadjipanayis, E. Devlin, A. Kostikas, Size-dependent magnetic properties of MnFe 2 O 4 fine particles synthesized by coprecipitation Physical Review B. ,vol. 54, pp. 9288- 9296 ,(1996) , 10.1103/PHYSREVB.54.9288
X. Batlle, M. García del Muro, A. Labarta, Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites Physical Review B. ,vol. 55, pp. 6440- 6445 ,(1997) , 10.1103/PHYSREVB.55.6440