Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8152545 | Journal of Magnetism and Magnetic Materials | 2018 | 15 Pages |
Abstract
In this paper, the effect of Gd/Ba co-doping on magnetocaloric properties for Sr2FeMoO6 is presented. Double-perovskite (Sr2-3xGdxBa2x)FeMoO6 (0.00â¯â¤â¯xâ¯â¤â¯0.20) were prepared by the solid reaction method. X-ray diffraction results showed that all samples were single phase and belonged to I4/m space group. X-ray photoelectron spectroscopy analysis of (Sr2â3xGdxBa2x)FeMoO6 samples showed that proportional variations in Fe3+/Fe2+ and Mo5+/Mo6+ were found under Gd/Ba co-doping. Field-cooled magnetization curves indicated that Gd/Ba co-doping led to the Curie temperature (Tc) drop from 394â¯K to 357â¯K. Arrot plots analysis of samples revealed a second-order magnetic transition. The magnetic entropy change of all samples increased initially and then decreased with temperature, and all samples exhibited the maximum magnetic entropy change near Tc. The maximum magnetic entropy change of samples in the magnetic field of 2T decreased from 0.72â¯Jâ¯Kâ1â¯kgâ1 to 0.54â¯Jâ¯Kâ1â¯kgâ1 because of Gd/Ba co-doping. Relative cooling power decreased correspondingly.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Yanchun Hu, Tengyu Guo, Xianwei Wang, Yawen Cui, Weixia Li, Xiangyu Zhao, Hongyan Liu,