Magnetocaloric effect in nano- and polycrystalline manganite La0.7Ca0.3MnO3 |
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| Authors: | M Pękała V Drozd JF Fagnard P Vanderbemden M Ausloos |
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| Institution: | (1) Department of Chemistry, University of Warsaw, Al. Zwirki i Wigury 101, 02-089 Warsaw, Poland;(2) Department of Chemistry, Kiev National Taras Shevchenko University, 60 Volodymyrska st, Kiev, 01033, Ukraine;(3) Center for Study Matter at Extreme Conditions, Florida International University, Miami, FL 33199, USA;(4) SUPRATECS, Montefiore Electricity Institute, B28, University of Liege, 4000 Liege, Belgium;(5) SUPRATECS, Institute of Physics, B5a, University of Liege, 4000 Liege, Belgium |
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| Abstract: | La0.7Ca0.3MnO3 samples were prepared in nano- and polycrystalline forms by the sol–gel and solid state reaction methods, respectively, and
structurally characterized by synchrotron X-ray diffraction. The magnetic properties determined by ac susceptibility and dc
magnetization measurements are discussed. The magnetocaloric effect in this nanocrystalline manganite is spread over a broader
temperature interval than in the polycrystalline case. The relative cooling power of the poly- and nanocrystalline manganites
is used to evaluate a possible application for magnetic cooling below room temperature.
PACS 75.30.Sg; 75.47.Lx; 77.80.Bh |
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