Room temperature magnetic and magnetocaloric properties of La<subscript>0.67</subscript>Ba<subscript>0.33</subscript>Mn<subscript>0.98</subscript>Ti<subscript>0.02</subscript>O<subscript>3</subscript> perovskite
In: Journal of Alloys & Compounds, Jg. 508 (2010-10-22), Heft 2, S. 292-296
Online
academicJournal
Zugriff:
Abstract: The influence of Ti-doping on the magnetic and magnetocaloric properties of La0.67Ba0.33Mn0.98Ti0.02O3 perovskite is investigated. La0.67Ba0.33Mn0.98Ti0.02O3 sample was prepared by ceramic route at 1400°C. It is a cubic Pm–3m single phase and exhibits a sharp ferromagnetic–paramagnetic (FM–PM) transition at a Curie temperature T C (314K) which is very close to room temperature. Above T C the data follow a Curie–Weiss law with a shift between experimental and calculated effective paramagnetic moment. The associated experimental magnetic entropy change (ΔS M) and the relative cooling power (RCP) have been determined. The observed field dependence of ΔS M is explained reasonably well by the Landau theory of second order phase transition. The maximum entropy change exhibits a linear dependence with the applied magnetic field. and RCP are respectively 3.21Jkg−1 K−1 (21.48mJcm−3 K−1) and 307Jkg−1 (2054mJcm−3) at 5T, which are about 30% of pure Gd. Our results on the magnetocaloric effect (MCE) are compared favourably with reported values for other doped manganites, thus concluding that our sample can be used as a magnetic refrigerant around room temperature. [ABSTRACT FROM AUTHOR]
Titel: |
Room temperature magnetic and magnetocaloric properties of La<subscript>0.67</subscript>Ba<subscript>0.33</subscript>Mn<subscript>0.98</subscript>Ti<subscript>0.02</subscript>O<subscript>3</subscript> perovskite
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Autor/in / Beteiligte Person: | Oumezzine, Ma. ; Zemni, S. ; Peña, O. |
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Zeitschrift: | Journal of Alloys & Compounds, Jg. 508 (2010-10-22), Heft 2, S. 292-296 |
Veröffentlichung: | 2010 |
Medientyp: | academicJournal |
ISSN: | 0925-8388 (print) |
DOI: | 10.1016/j.jallcom.2010.08.145 |
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