A Magnetocaloric Glass from an Ionic-Liquid Gadolinium Complex.
Chemphyschem
; 23(12): e202200213, 2022 Jun 20.
Article
em En
| MEDLINE
| ID: mdl-35441760
ABSTRACT
[Gd5 (L)16 (H2 O)8 ](Tf2 N)15 was obtained from reaction of Gd2 O3 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 -11.36â
J K-1 kg-1 at 1.8â
K for a 0-7 T magnetic field change, and with a refrigerant capacity of 125.9â
J kg-1 , in the 1.8-50â
K interval.
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MEDLINE
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En
Ano de publicação:
2022
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Article