Journal article
Properties of magnetocaloric materials with a distribution of Curie temperatures
Thermo Ceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Fuel Cells and Solid State Chemistry Division. Management, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
The magnetocaloric properties of inhomogeneous ferromagnets that contain distributions of Curie temperatures are considered as a function of the width of such a distribution. Assuming a normal distribution of the Curie temperature, the average adiabatic temperature change, ΔTad, the isothermal magnetic entropy change, Δs, and the heat capacity, cp, in zero magnetic field and an applied magnetic field of , have been calculated using the mean field model of ferromagnetism.
Interestingly, both the peak position and amplitude of each of these parameters vary differently with the width of the distribution, explaining the observed mismatch of peak temperatures reported in experiments. Also, the field dependence of ΔTad and Δs is found to depend on the width of the distribution.
Language: | English |
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Year: | 2012 |
Pages: | 564-568 |
ISSN: | 18734766 and 03048853 |
Types: | Journal article |
DOI: | 10.1016/j.jmmm.2011.08.044 |
ORCIDs: | Bahl, Christian Robert Haffenden , Bjørk, Rasmus , Smith, Anders and Nielsen, Kaspar Kirstein |