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An excellent cryogenic magnetic cooler: magnetic and magnetocaloric study of an inorganic frame material

Abstract

The cryogenic magnetic coolers based on the magnetocaloric effect (MCE) of paramagnetic compounds usually need relatively large fields to realise a practical cooling performance. Thus, it is of significance to quest molecule-based cryogenic magnetic coolers with high perforamnce of MCEs under low fields (smaller than 2 T), considering the ready availability of low fields by commercial Nd–Fe–B permanent magnets. In this work, the crystal structure, magnetic susceptibility and isothermal magnetization for the inorganic compound Gd(OH)SO4 (1) has been investigated. The title compound exhibits 3D structute with Gd-oxygen chain as supramolecular building units. Magnetic characterisations indicated that adjacent GdIII ions show weak magnetic couplings in 1. Because of the integration of large metal/ligand mass ratio, weak magnetic couplings and dense framework, the observed maximum entropy change (−ΔSmmax) for 1 was up to 53.5 J kg−1 K−1 or 276 mJ cm−3 K−1 for ΔH = 7 T and T = 2 K, comparable to the performance of commercial gadolinium gallium garnet Gd3Ga5O12 (GGG, −ΔSmmax = 38.4 J kg−1 K−1 or 272 mJ cm−3 K−1 with ∆H = 7 T). Notably, the −ΔSmmax of 1 still reaches 27.5 J kg–1 K–1 at T = 2 K and ΔH = 2 T, and 38.3 J kg–1 K–1 at T = 2 K and ΔH = 3 T, which already surpasses GGG (about 24 J kg-1 K-1 with ∆H = 3 T) and makes 1 an an excellent cryogenic magnetic cooler for low-temperature applications, even in low fields.

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Publication details

The article was received on 29 Aug 2018, accepted on 29 Sep 2018 and first published on 01 Oct 2018


Article type: Research Article
DOI: 10.1039/C8QM00439K
Citation: Mater. Chem. Front., 2018, Accepted Manuscript
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    An excellent cryogenic magnetic cooler: magnetic and magnetocaloric study of an inorganic frame material

    Y. Han, S. Han, J. Pan, Y. Ma and G. Wang, Mater. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QM00439K

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