An excellent cryogenic magnetic cooler: magnetic and magnetocaloric study of an inorganic frame material. (30th October 2018)

• Record Type: Journal Article
• Authors: Han, Yue; Han, Song-De; Pan, Jie; Ma, Yu-Juan; Wang, Guo-Ming
• Is Part Of: Materials chemistry frontiers. Volume 2:Number 12(2018)
• Page Start: 2327
• Page End: 2332
• Publication Date: 2018-10-30
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/c8qm00439k
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : We report the crystal structure, magnetic susceptibility and isothermal magnetization of inorganic frame material Gd(OH)SO4 (1 ). The maximum entropy changes for1 at high field (7 T) and low fields (smaller than 3 T) were comparable to commercial gadolinium gallium garnet Gd3 Ga5 O12 . 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 search for molecule-based cryogenic magnetic coolers with high performance of the MCE 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 ) have been investigated. The title compound exhibits a 3D structure with Gd-oxygen chains as the supramolecular building units. Magnetic characterisations indicated that adjacent Gd III ions show weak magnetic couplings in1 . Because of the integration of large metal/ligand mass ratio, weak magnetic couplings and a dense framework, the observed maximum entropy change (−Δ S maxm) for1 was up to 53.5 J kg −1 K −1 or 276 mJ cm −3 K −1 for Δ H = 7 T and T = 2 K, comparable to the performance of commercial gadolinium gallium garnet Gd3 Ga5 O12 (GGG, −Δ S maxm = 38.4 J kg −1 K −1 or 272 mJ cm −3 K −1 with Δ H = 7 T). Notably, the −Δ S maxm of1 still reaches 27.5 J kg −1 K −1 at T = 2 K and Δ H = 2 T, and 38.3 J kg −1 K −1 at T = 2 K and Δ H = 3 T, which already surpasses GGG (about 24 J kg −1 K −1 with Δ H = 3 T) and makes1 a superior cryogenic magnetic cooler for low-temperature applications, even in low fields.