In this work, the magnetic and magnetocaloric properties of (La_0.7Sm_0.3)_0.67Ba_0.33MnO₃ manganite produced by sol–gel method were investigated by magnetization and direct-temperature change measurements. As the temperature decreases in M(T) measurements, the sample shows the transition from paramagnetic to ferromagnetic state at 160 K, which is the magnetic phase transition temperature where magnetization suddenly drops. The maximum magnetic entropy change value from M(H) measurements in the transition region is determined as 2.12 Jkg⁻¹ K⁻¹ under 4.8 T magnetic field. It was found that the material had a second-order transition due to the positive slope of the Arrott plots, and this behavior was confirmed by the universal curve obtained by the normalized magnetic entropy change curves versus the rescaled temperature axis. ΔT_ad of the sample was measured with the adiabatic magneto-calorimetry system directly and the maximum value of ΔT_ad was measured as 0.72 K under 3 T magnetic field change.

在这项工作中，通过磁化和直接温度变化测量研究了通过溶胶-凝胶法生产的（La _0.7 Sm _0.3）_0.67 Ba _0.33 MnO ₃锰矿的磁和磁热性质。在M（T）测量中，随着温度降低，样品显示出在160 K时从顺磁态到铁磁态的转变，这是磁化强度突然下降的磁性相变温度。由M（H）测量得出的过渡区域中的最大磁熵变值确定为2.12 Jkg ^-1  K ^-1在4.8 T磁场下。发现该材料由于Arrott图的正斜率而具有二阶跃迁，并且这种行为已通过归一化的磁熵变曲线相对于重新缩放的温度轴获得的通用曲线得到了证实。Δ Ť_广告的样品与直接绝热磁量热学系统和Δ的最大值测定Ť_广告的混合物在3个T磁场变化测量为0.72ķ。