ABSTRACT

We report the structural and magnetocaloric properties of the perovskite manganite composites (La_0.6Sr_0.4MnO₃)/x(Sb₂O₃) (LSMO/Sb₂O₃) (x = 0.07 and 0.18) synthesized by the solid-state reaction method. X-ray diffraction (XRD) study was employed to confirm the formation of both the phases in composites. The results of magnetic measurements indicate that Sb₂O₃ mainly segregates at the grain boundaries of LSMO. Arrott analysis and master curve behavior reveal a second-order magnetic phase transition in the composite samples. Magnetic entropy change increases with increasing Sb₂O₃ content and a maximum of 3 J/kg. K at 2 T has been observed in the LSMO/(0.18) Sb₂O₃ sample. The enhanced ΔS_M of these composites makes them attractive for potential applications.

摘要

我们报告了通过固态反应合成的钙钛矿锰酸盐复合材料 (La _0.6 Sr _0.4 MnO ₃ )/x(Sb ₂ O ₃ ) (LSMO/Sb ₂ O ₃ ) ( x  = 0.07 和 0.18)的结构和磁热特性方法。采用 X 射线衍射 (XRD) 研究来确认复合材料中两相的形成。磁性测量结果表明Sb ₂ O ₃主要偏析在LSMO的晶界处。Arrott 分析和主曲线行为揭示了复合样品中的二阶磁相变。磁熵变随着 Sb 的增加而增加₂ O ₃含量最高为3 J/kg。在 LSMO/(0.18) Sb ₂ O ₃样品中观察到 K 为 2 T。这些复合材料增强的 ΔS _M使它们对潜在应用具有吸引力。