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Hysteretic behaviours of first-order phase transition magnetocaloric materials.
Author(s) : TEGUS O., ZHANG L., TRUNG N. T., et al.
Summary
The hysteretic behaviour of some first-order magnetic phase transition materials with large magnetocaloric effect has been investigated by means of magnetic measurements. An unusual phase transition, so called 'virgin' effect, exists in some Mn-based compounds, but not in the Gd(5)[Si,Ge]4 and La(Fe,Si)13 compounds. In thermal hysteretic regime, the magnetic behaviour of the first-order phase transition materials strongly depends on the history of thermal and field cycles. A reversible field-induced phase transition is important for producing a reversible large magnetocaloric effect. The mechanism of thermal hysteresis is discussed on the basis of Landau theory by taking into account the coupling between magnetization and strain.
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Details
- Original title: Hysteretic behaviours of first-order phase transition magnetocaloric materials.
- Record ID : 2009-1610
- Languages: English
- Source: 3rd International Conference on Magnetic Refrigeration at Room Temperature
- Publication date: 2009/05/11
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Indexing
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Themes:
Refrigerant circulation: piping, control, automation, safety;
Caloric cooling (magnetocaloric, electrocaloric, elastocaloric and barocaloric cooling);
Other refrigerating systems (desiccant cooling, thermoelectrics, thermoacoustics…) - Keywords: Germanium; Manganese; Magnetic refrigerator; Lanthanum; Transition (generic); Alloy; Silicon; Magnetic property; Phase; Material; Gadolinium; Iron
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