Magnetocaloric effect and critical behavior in Fe-doped La0.67Sr0.33Mn1−xFexO3 manganites. Issue 16 (December 2016)

• Record Type: Journal Article
• Authors: Wang, G.F.; Zhao, Z.R.; Li, H.L.; Zhang, X.F.
• Is Part Of: Ceramics international. Volume 42:Issue 16(2016)
• Page Start: 18196
• Page End: 18203
• Publication Date: 2016-12
• Subjects: Manganite -- Magnetocaloric effect -- Refrigeration capacity -- Critical behavior; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.08.138
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this paper we report on the magnetocaloric effect and critical behavior of La0.67 Sr0.33 Mn1− x Fe x O3 ( x =0, 0.05, 0.1 and 0.2) manganites. The samples were prepared by the sol-gel method. X-ray diffraction patterns indicate that the Fe-doped manganites crystallize in a single phase with the rhombohedral structure. The Curie temperature decreases monotonously from 355 K to 100 K as the Fe concentration increases from 0 to 0.2. The maximum values of isothermal entropy change ( − Δ S T, max ) are found to be 1.66, 0.59, 0.79 and 0.42 J/kg K under a magnetic field change of 3 T for x =0, 0.05, 0.1 and 0.2, respectively. Although the − Δ S T, max maxima are low, the manganites still exhibit significant refrigeration capacity (39–163 J/kg). The critical behaviors of the manganites have been studied by means of modified Arrott plot, Widom scaling and Kouvel-Fisher methods. The obtained critical exponents indicate that the Fe-doping level has significant influences on the critical behavior of the phase transition in the Fe-doped manganites.