Liu X.and Geng, D. and Jiang, J. and Li, B. and Ma, S. and Li, D. and Liu, W. and Zhang, Z. (2010) Magnetic properties and large cryogenic low-field magnetocaloric effect of HoCo2 nanoparticles without core/shell structure. Journal of Nanoparticle Research, 12 (4). pp. 1167-1172.
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Official URL: http://dx.doi.org/10.1007/s11051-009-9717-8
The HoCo2 nanoparticles are found to be stable in air without any shell protection. The HoCo2 nanoparticles display superparamagnetic properties between their blocking temperature of 40 K and Curie temperature of 78 K. The magnetic-entropy change increases with decreasing temperature at a certain magnetic-field change, which is ascribed to the competition between the Zeeman energy and thermal-agitation energy at low temperatures. A large magnetic-entropy change of 19.4 J kg-1 K-1 was found at 7.5 K in an applied-field change from 1 to 7 T, while 6.1 J kg-1 K-1 was achieved in a low field change of 1 T. HoCo2 nanoparticles are useful for application of magnetic refrigeration at low temperatures.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||13 May 2010 12:54|
|Last Modified:||13 May 2010 13:19|
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