| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1614193 | Journal of Alloys and Compounds | 2013 | 5 Pages |
Hydrogenation of Ce2Fe17−xMnx, x = 0–1.7 compounds results in an increase of the peak entropy change −ΔSM about by half. The maximum entropy change −ΔSM for the Ce2Fe17H2.1 ferromagnet is 4.9 J/kg K at T = 330 K in a field of 5 T. In the Ce2Fe17−xMnxHy systems with the ground ferromagnetic state and high-temperature antiferromagnetic one, the peak entropy change −ΔSM increases when the temperatures of the magnetic phase transitions ΘT, TN approach each other with growing the H content. By means of extrapolation of the (TN–ΘT) difference to the zero value one can obtain the greatest possible value of the maximum entropy change −ΔSM in the system. A superposition of the −ΔSM(T) maxima at ΘT and TN in the case of compounds which have two points of magnetic phase transitions causes a drastic increase of the relative cooling power, as compared with compounds having only one magnetic phase transition at TN or TC.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Hydrogenation of Ce2Fe17−xMnx causes increase of MCE about by half. ► MCE exhibits peaks at the temperatures ΘT, TN, TC of magnetic phase transitions. ► Extrapolation of (TN–ΘT) to zero predicts the greatest value of MCE in a system. ► The maximum obtained entropy change is 4.9 J/kg K at T = 330 K for Ce2Fe17H2.1. ► A superposition of MCE maxima at ΘT and TN causes drastic increase of RCP.
