Phase Diagram and Magnetocaloric Effect of Mn{sub 2}Tb-Fe{sub 2}Tb System
Journal Article
·
· Journal of Superconductivity and Novel Magnetism
- Guilin University of Electronic Technology, School of Materials Science and Engineering (China)
Mn{sub 2}Tb-Fe{sub 2}Tb phase diagram was drawn, and the crystal structure and magnetocaloric effect of (Mn{sub 1-x}Fe{sub x}){sub 2}Tb (x ≤ 0.5) compounds at the Mn-rich side were systematically studied. X-ray diffraction demonstrates that all these Laves phase compounds crystallize in the cubic MgCu{sub 2}-type structure. The Rietveld results of XRD shows the cell volume increases with Fe content. The influence of doping effect in (Mn{sub 1-x}Fe{sub x}){sub 2}Tb (x ≤ 0.5) compounds on their magnetic and magnetocaloric properties for all solid solutions is presented. The Curie temperature (Tc) rises from 49 K (for x = 0.0) to 322 K (for x = 0.5), depending on Fe content significantly. Based on Landau’s theory, the magnetization behavior and magnetic transition were analyzed. The magnetocaloric effect (MCE) of (Mn{sub 1-x}Fe{sub x}){sub 2}Tb compounds is also discussed using the Maxwell relation, and the maximum magnetic entropy change (− ΔS{sub M}{sup Max}) approaches to 10 J kg{sup −1} K{sup −1} at x = 0 under a field ranging from 0 to 5 T. The best relative cooling power (RCP) reaches 535.03 J/kg (x = 0.1).
- OSTI ID:
- 22922873
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 9 Vol. 32; ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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