IIR document
Development of manganite materials for room-temperature magnetocaloric application.
Author(s) : AMARAL J. S., REIS M. S., ARAÚJO J. P., et al.
Summary
Manganites of general formula ABMnO3 (where A is a trivalent rare-earth ion and B is a divalent dopant) have interesting properties, namely colossal magnetoresistance and their applicability as materials for active magnetic regenerators. La-Sr-Mn-O (LSMO) is a ferromagnet presenting a considerable magnetocaloric effect, with operating Curie temperature at about 90 °C and magnetic entropy variation comparable to pure gadolinium. The authors studied the LSMO system where lanthanum ions are substituted by erbium or europium, effectively lowering the Curie temperature to near-room temperature and below. This substitution also increases the relative cooling power of the materials, an effect associated to the increased magnetoelastic contribution to the magnetic free energy. These results permit the creation of composites or thermal cascades of chemically similar compounds to produce an active magnetic element with a wide temperature interval of operation (from -40 to 90 °C). These materials can be synthesized by solid-state reaction or by sol-gel techniques, and are relatively cost-effective.
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Details
- Original title: Development of manganite materials for room-temperature magnetocaloric application.
- Record ID : 2006-1258
- Languages: English
- Source: 1st International Conference on Magnetic Refrigeration at Room Temperature
- Publication date: 2005/09/27
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Indexing
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Themes:
Refrigerant circulation: piping, control, automation, safety;
Caloric cooling (magnetocaloric, electrocaloric, elastocaloric and barocaloric cooling) - Keywords: Manganese; Magnetic refrigerator; Lanthanum; Temperature; Alloy; Strontium; Magnetic property; Performance; Material; Europium; Erbium; Curie
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- Date : 2005/09/27
- Languages : English
- Source: 1st International Conference on Magnetic Refrigeration at Room Temperature
- Formats : PDF
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Effects of alloying on magnetocaloric character...
- Author(s) : YUCEL A., ELERMAN Y., AKSOY S.
- Date : 2005/09/27
- Languages : English
- Source: 1st International Conference on Magnetic Refrigeration at Room Temperature
- Formats : PDF
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- Date : 2012/09/17
- Languages : English
- Source: 5th International Conference on Magnetic Refrigeration at Room Temperature (Thermag V). Proceedings: Grenoble, France, September 17-20, 2012.
- Formats : PDF
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The influence of magnetic anisotropy on the mag...
- Author(s) : SKOKOV K. P., KOSHKOD'KO Y. S., PASTUSHENKOV Y. G., et al.
- Date : 2009/05/11
- Languages : English
- Source: 3rd International Conference on Magnetic Refrigeration at Room Temperature
- Formats : PDF
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Transport and magnetic properties of Pr-Sr-Mn-O...
- Author(s) : DIMITROV D., APOSTOLOV A., PIPEROV N.
- Date : 2005/09/27
- Languages : English
- Source: 1st International Conference on Magnetic Refrigeration at Room Temperature
- Formats : PDF
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