Magnetic and Magnetocaloric Properties of LaPbAgMnO Compounds.
In: Journal of Superconductivity & Novel Magnetism, Jg. 25 (2012-08-01), Heft 6, S. 1937-1945
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Zugriff:
In this paper, we have studied the magnetic and magnetocaloric properties of the perovskite manganites LaPbAgMnO (0≤ x≤0.15), which show a sharp paramagnetic-ferromagnetic phase transition over a wide temperature range ( T=250-401 K). The Curie temperature has been analyzed by two methods: using the numerical derivative dM/ dT and the thermodynamic model. The experimental results indicate that T decreases from 368 to 288 K with increasing Ag substitution independently of the method used to obtain T. Upon 10 KOe applied magnetic field, the large magnetic-entropy change (|Δ S|) reaches values of 2.75, 3, 3.25 and 3.5 J/kg K for x=0, 0.05, 0.10 and 0.15 compositions, respectively, which are comparable to that of Gd. The relative cooling power (RCP) increases with increasing Ag content from 68.75 ( x=0) to 156.27 J/kg ( x=0.15) for Δ H=10 KOe. Through these results, LaPbAgMnO materials are strongly suggested for the use of active refrigerants for magnetic refrigeration technology near room temperature. [ABSTRACT FROM AUTHOR]
Titel: |
Magnetic and Magnetocaloric Properties of LaPbAgMnO Compounds.
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Autor/in / Beteiligte Person: | Mtiraoui, N. ; Dhahri, J. ; Oumezine, M. ; Dhahri, E. |
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Zeitschrift: | Journal of Superconductivity & Novel Magnetism, Jg. 25 (2012-08-01), Heft 6, S. 1937-1945 |
Veröffentlichung: | 2012 |
Medientyp: | academicJournal |
ISSN: | 1557-1939 (print) |
DOI: | 10.1007/s10948-012-1519-z |
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