A Magnetocaloric Glass from an Ionic-Liquid Gadolinium Complex |
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| Authors: | Seda Kartal Dr Guillaume Rogez Dr Jérôme Robert Dr Benoît Heinrich Dr Athanassios K Boudalis |
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| Institution: | 1. Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra), Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081 Strasbourg, France;2. Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504, 67000 Strasbourg, France |
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| Abstract: | Gd5(L)16(H2O)8](Tf2N)15 was obtained from reaction of Gd2O3 with 1-carboxymethyl-3-ethylimidazolium chloride (LHCl). The material was found to be an ionic liquid that freezes to glassy state on cooling to −30 °C. Variable-temperature magnetic studies reveal the presence of weak magnetic intramolecular interactions in the glass. Isothermal variable-field magnetization demonstrates a magnetocaloric effect (MCE), which is the first finding of such an effect in a molecular glass. This MCE is explainable by an uncoupled representation, with a magnetic entropy change of −11.36 J K−1 kg−1 at 1.8 K for a 0–7 T magnetic field change, and with a refrigerant capacity of 125.9 J kg−1, in the 1.8-50 K interval. |
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| Keywords: | ionic liquids molecular glasses magnetocaloric effect molecular magnets gadolinium complexes |
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