Bibliographic Details
| Title: |
Large magnetocaloric effect in Ti-modified La0.70Sr0.30MnO3 perovskite |
| Authors: |
Kallel, Sami1 Sami.Kallel@issatso.rnu.tn, Kallel, Nabil1, Peña, Octavio2, Oumezzine, Mohamed1 |
| Source: |
Materials Letters. May2010, Vol. 64 Issue 9, p1045-1048. 4p. |
| Subjects: |
Perovskite, Titanium, Magnetic properties of metals, Entropy, Curie temperature, Magnetic fields, Fermi liquid theory, Cooling |
| Abstract: |
Abstract: The effect of Ti substitution on the magnetocaloric effect of the La0.70Sr0.30MnO3 perovskite was investigated. The magnetic entropy change (−ΔS M ) was deduced by two methods: a Maxwell relation and the Landau theory. The magnetocaloric data displays a large value of the magnetic entropy change (−ΔS M ) near the Curie temperature (T C =210K), which increases when increasing the applied magnetic field. A good agreement is found between the experimental (−ΔS M ) and the one estimated by Landau theory. The relative cooling power values vary from 49 to 288Jkg−1 upon variation of the applied magnetic field at 1 and 5T. Under 5T, the relative cooling power value for La0.70Sr0.30Mn0.90Ti0.10O3 is about 70% of the conventional refrigerant Gd material. As a result, the herein reported compound can be considered as a promising material in magnetic refrigeration technology. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
