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Erschienen in:
04.07.2020
Direct measurement of adiabatic temperature change in (La0.7Sm0.3)0.67Ba0.33MnO3
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 15/2020
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Abstract
In this work, the magnetic and magnetocaloric properties of (La0.7Sm0.3)0.67Ba0.33MnO3 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. ΔTad of the sample was measured with the adiabatic magneto-calorimetry system directly and the maximum value of ΔTad was measured as 0.72 K under 3 T magnetic field change.