Magnetocaloric Effect in 3D Gd(III)-Oxalate Coordination Framework
Cryogenic magnetic refrigerants based on the magnetocaloric effect (MCE) hold significant potential as substitutes for the expensive and scarce He-3. Gd(III)-based complexes are considered excellent candidates for low-temperature magnetic refrigerants. We have synthesized a series of Ln(III)-based m...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/1/32 |
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| Summary: | Cryogenic magnetic refrigerants based on the magnetocaloric effect (MCE) hold significant potential as substitutes for the expensive and scarce He-3. Gd(III)-based complexes are considered excellent candidates for low-temperature magnetic refrigerants. We have synthesized a series of Ln(III)-based metal-organic framework (MOF) <b>Ln-3D</b> (Ln = Gd/Dy) by the slow release of oxalates in situ from organic ligands (disodium edetate dehydrate (EDTA-2Na) and thiodiglycolic acid). Structural analysis shows that the <b>Ln-3D</b> is a neutral 3D framework with one-dimensional channels connected by [Ln(H<sub>2</sub>O)<sub>3</sub>]<sup>3+</sup> as nodes and C<sub>2</sub>O<sub>4</sub><sup>2−</sup> as linkers. Magnetic measurements show that <b>Gd-3D</b> exhibits very weak antiferromagnetic interactions with a maximum −Δ<i>S</i><sub>m</sub> value of 36.6 J kg<sup>−1</sup> K<sup>−1</sup> (−Δ<i>S</i><sub>v</sub> = 74.47 mJ cm<sup>−3</sup> K<sup>−1</sup>) at 2 K and 7 T. The −Δ<i>S</i><sub>m</sub> value is 28.4 J kg<sup>−1</sup> K<sup>−1</sup> at 2 K and 3 T, which is much larger than that of commercial Gd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> (GGG), indicating its potential as a low-temperature magnetic refrigerant. |
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| ISSN: | 2079-4991 |