Direct measurement of adiabatic temperature change in (La0.7Sm0.3)0.67Ba0.33MnO3
| Autor: | Selda Kılıç Çetin |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Condensed Matter Physics Manganite 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Magnetic field Paramagnetism Magnetization Ferromagnetism 0103 physical sciences Magnetic refrigeration Magnetic phase transition Electrical and Electronic Engineering Adiabatic process |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 31:12842-12847 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-020-03837-2 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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