Effect of Ag substitution on structural, magnetic and magnetocaloric properties of Pr 0.6 Sr 0.4– x Ag x MnO 3 manganites
| Autor: | Marek Pękała, Ph. Vanderbemden, R. Thaljaoui, J.-F. Fagnard |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Diffraction Magnetic measurements Materials science Transition temperature 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Crystallography Geochemistry and Petrology 0103 physical sciences Cooling power Magnetic refrigeration Orthorhombic crystal system Single phase 0210 nano-technology |
| Zdroj: | Journal of Rare Earths. 35:875-882 |
| ISSN: | 1002-0721 |
| Popis: | A systematic investigation on the structural, magnetic and magnetocaloric properties of Pr 0.6 Sr 0.4– x Ag x MnO 3 ( x =0.05 and 0.1) manganites was reported. Rietveld refinements of the X-ray diffraction patterns confirmed that all samples were single phase and crystallized in the orthorhombic structure with Pnma space group. Magnetic measurements in a magnetic applied field of 0.01 T revealed that the ferromagnetic-paramagnetic transition temperature T C decreased from about 293 to 290 K with increasing silver content from x =0.05 to 0.1. The reported magnetocaloric entropy change and relative cooling power for both samples were considerably remarkable with a Δ S max value of 1.9 J/(kg·K) and maximum RCP values of 100 J/kg, under a magnetic field change (Δ µ 0 H ) equal to 1.8 T. The analysis of the universal curves gave an evidence of a second order magnetic transition for the studied samples. The magnetic field influence on both the magnetic entropy change and the relative cooling power was also studied and discussed. |
| Databáze: | OpenAIRE |
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