Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5457503 | Intermetallics | 2017 | 5 Pages |
Abstract
We have fabricated melt-spun ribbons of nominal composition ErMn2 and studied their phase constitution and magnetocaloric (MC) properties by X-ray diffraction, scanning electron microscopy (SEM), magnetization and heat capacity measurements. The major phase formed shows the MgZn2-type hexagonal structure (C14-type); however, both XRD and SEM analyses revealed the formation of impurity phases (i.e., Er6Mn23 and ErMn12). Ribbons exhibit a saturation magnetization of 149 Am2kgâ1 at 2 K and a Curie temperature of TC = 15 K. A field-induced metamagnetic transition at very low critical magnetic fields was observed below 8 K that leads to a change of sign in the magnetic entropy change ÎSM below this temperature (ÎSMpeak = 2.5 Jkgâ1Kâ1 at 2 K and 5 T). For a magnetic field change of 5 T (2 T) applied along the ribbon length, the samples show a large peak value of the magnetic entropy change ÎSMpeak of â20.5 (â10.8) Jkgâ1Kâ1, a full-width at half-maximum δTFWHM for the ÎSM(T) curve of 20 (12) K, and a maximum adiabatic temperature change ÎTadmax of 7.4 (3.6) K. The obtained results are compared with the reported in literature by other authors for bulk alloys.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
J.L. Sánchez Llamazares, P. Ibarra-Gaytán, C.F. Sánchez-Valdés, P. Álvarez-Alonso, A.D. MartÃnez-Iniesta,