The Magnetocaloric Effect and Electrochemistry Corrosion of La0.7-xSr0.3EuxMnO3Manganite

The structure, magnetic, and the magnetocaloric effecton the La0.7-xEuxSr0.3MnO3sample prepared by the solid-state reaction method had been investigated. The structure data obtained from X-ray powder diffraction and Rietveld refinement analysis show that all these samples have single-phase and a rhombohedra structure with R-3c space group. With the substitution of the Eu3+ content, the volume of unit cells and Mn-O-Mn bond angle increase monotonically as well as the Curie temperature TC, which is caused by the weakening of the double exchange interaction. A magnetic entropy change (-ΔSM)max of 2.21 J kg-1K-1 is obtained under a magnetic field change of 20 kOe for La0.66Eu0.04Sr0.3MnO3 sample. All samples exhibit the FM-PM phase transition with a second-order nature. In the electrochemistry corrosion experiment for the sample, the mass loss rate of the sample is small, so the material possesses optimal anticorrosion performance. The lattice structure and the Curie temperature of the material can be manipulated to some extend with Eu3+ substitution, which provides a method for magnetic refrigeration in an electrolyte solution environment.