Magnetocaloric properties of the A-site co-doping double-perovskite of Sr2FeMoO6

被引：17
作者：
Hu, Yanchun [1 ]
Guo, Tengyu [1 ]
Wang, Xianwei [1 ]
Cui, Yawen [1 ]
Li, Weixia [1 ]
Zhao, Xiangyu [1 ]
Liu, Hongyan [2 ]
机构：
[1] Henan Normal Univ, Henan Prov Key Lab Photovolta Mat, Coll Phys & Mat Sci, Xinxiang 453007, Henan, Peoples R China
[2] Heze Univ, Coll Phys & Elect Engn, Heze 274015, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2018年 / 466卷
关键词：
Crystal structure; Magnetic properties; Magnetocaloric effect; MAGNETIC-PROPERTIES; OXYGEN NONSTOICHIOMETRY; TRANSPORT-PROPERTIES; SUBSTITUTION;
D O I：
10.1016/j.jmmm.2018.07.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, the effect of Gd/Ba co-doping on magnetocaloric properties for Sr2FeMoO6 is presented. Doubleperovskite (Sr2-3xGdxBa2x)FeMoO6 (0.00 <= x <= 0.20) were prepared by the solid reaction method. X-ray diffraction results showed that all samples were single phase and belonged to 14/m space group. X-ray photoelectron spectroscopy analysis of (Sr2-3xGdxBa2x)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 394 K to 357 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 0.72 J kg(-1) to 0.54 J K-1 kg(-1) because of Gd/Ba co-doping. Relative cooling power decreased correspondingly.
引用
收藏
页码：133 / 137
页数：5
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