Title :
Tunable Curie Temperature and Magnetocaloric Effect in Mg-Doped (La, Sr)MnO3 Manganites
Author :
Wang, G.F. ; Zhao, Z.R. ; Wang, D.L. ; Zhang, X.F.
Author_Institution :
Key Lab. of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia Univ. of Sci. & Technol., Baotou, China
Abstract :
In this paper, we report on the structural, magnetic, and magnetocaloric properties of La0.67Sr0.33-xMgxMnO3 (x = 0, 0.05, 0.15, and 0.2) manganites synthesized by sol-gel method. The Mg-doping does not modify the crystal structure of the undoped manganite, but results in a slight change of the lattice parameters. Both Curie temperature and saturation magnetization decrease with increasing Mg content. With a field change of 5 T, the maximum values of isothermal entropy change are found to be 2.49, 1.28, 1.37, and 1.30 J/kg· K for x = 0, 0.05, 0.15, and 0.2, respectively. The Mg-doped manganites exhibit a stable magnetocaloric effect in a wide temperature range from ~50 to ~300 K, which is important to magnetic refrigeration.
Keywords :
Curie temperature; crystal structure; entropy; lanthanum compounds; lattice constants; magnesium; magnetic cooling; magnetisation; sol-gel processing; strontium compounds; Curie temperature; La0.67Sr0.33-xMgxMnO3; Mg content; Mg-doped manganites; crystal structure; isothermal entropy change; lattice parameters; magnetic properties; magnetic refrigeration; magnetocaloric effect; saturation magnetization; sol-gel method; structural properties; Amorphous magnetic materials; Entropy; Magnetic hysteresis; Magnetic properties; Magnetization; Saturation magnetization; Temperature; Curie temperature; Magnetic property; Magnetocaloric effect; Manganite; magnetic property; magnetocaloric effect (MCE); manganite;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2439732
