Large magnetic entropy change in La0.75Ca0.25MnO3

Abstract

Magnetic entropy change of La0.75Ca0.25MnO3 with different particle size has been investigated. Magnetic entropy change ∼4.7 J/kg K larger than that of Gd has been observed at 224 K under a magnetic field of 1.5 T in comparatively big particles. This phenomenon of large magnetic entropy change indicates that the perovskite-type manganese oxides have potential applications for magnetic refrigerants in high temperature.

Inverse magnetocaloric effect in sol–gel derived nanosized cobalt ferrite

“…For 5-nm-sized cobalt ferrite nanoparticles prepared by the co-precipitation technique the maximum MCE value reported was 0.14 J/kg K −1 at an applied field of 35 kOe [10]. Hence, the magnitude of the maximum MCE value in our case is higher than that was reported for different ferrite nanoparticles like zinc ferrite, manganese zinc ferrite and nickel ferrite [9][10][11][12].…”

“…Other promising materials are lanthanum perovskite manganites, Heusler alloys, MnAs-based compounds, La(Fe,Si) 13 -type alloys, etc. [11][12][13].…”

Bi doping effects on the physical properties of Pr0.6Sr0.4Mn1−xBixO3 (0≤x≤0.2) manganese oxides

“…8 the temperature dependence of the spontaneous magnetization (M sp ) deduced from the M(H) curves and A large magnetic entropy change was recently observed in perovskite-type ferromagnetic oxides [20,21]. The intense interest in perovskite materials has been prompted by the observation of colossal magnetoresistance effect [22][23][24].…”

The magnetocaloric effect in (Dy,Tb)Co2 alloys

“…The important of first-order on large magnetocaloric effect has been widely recognized by researchers [5,6]. For RCo 2 compounds, TbCo 2 and DyCo 2 are the neighbours with the opposite transition types.…”