Role of Sr2+ on magnetocaloric properties of La1-xSrxMnO3
Abstract
The magnetic refrigeration is a technology with high-energy efficiency and low environmental impact. The most economical materials for this application is La0.7Ca0.3MnO3, however its working temperature is very low (260 K). In this work, the effect of modification with Sr2+ on the magnetocaloric properties and the operating temperature of La1-xSr-xMnO3 (0 ≤ x ≤ 0.5, Δx = 0.1) will be analyzed. The transformation from orthorhombic structure (Pnma) to trigonal (R3c: H) and tetragonal (P4/m) was confirmed by XRD, depending on the strontium concentration. Vibrating sample magnetometry showed ferromagnetic order at room temperature for all compositions. The Curie temperatures (Tc) were found in the range of 330 to 370 K. Likewise, the magnetic isotherms around the Tc were obtained for the composition x = 0.2, their analysis allowed to obtain the magnetocaloric effect at 18 kOe, obtaining an entropy change (-ΔS) of 2.76 Jkg-1K-1, and a cooling capacity (RC) of 98.3 J kg-1
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