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Équipe 103 : Composés intermétalliques et matériaux hybridesInternational audienceMagnetic refrigerants incorporating Gd3+ ions and light organic ligands offer a good balance between isolation of the magnetic centers and their density. We synthesized the framework material Gd-2(C2O4)(3)(H2O)6 center dot 0.6H(2)O by a hydrothermal route and characterized its structure. The honeycomb lattice of Gd3+ ions interlinked by oxalate ligands in the (a,c) plane ensures their decoupling in terms of magnetic exchange interactions. This is corroborated by magnetic measurements indicating negligible interactions between the Gd3+ ions in this material. The magnetocaloric effect was evaluated from isothermal magnetization measurements. The maximum entropy change -Delta S-M(max) reaches 75.9 mJ cm(-3) K-1 (around 2 K) for a moderate field change (2 T)

Magnetocaloric effect in gadolinium-oxalate framework Gd2(C2O4)3(H2O)6⋅(0⋅6H2O)