Magnetic and magnetocaloric properties in sulfospinel Cd1−Zn Cr2S4 (x= 0, 0.3, 0.5) powders

Bouhbou, M.; Moubah, R.; Belayachi, Wissal; Belayachi, A.; Bessaïs, L.; Lassri, H.

doi:10.1016/j.cplett.2017.09.059

Cited by 16 publications

(2 citation statements)

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“…Surprisingly, only a few articles focused on the magnetocaloric properties of inorganic sulfides and oxysulfides. − EuS is characterized by a significant magnetocaloric effect at T C = 16.5 K, with a maximum magnetic entropy change from bulk of 16.8 and 28.4 J kg –1 K –1 for magnetic field changes of 2 and 5 T, respectively . Orthorhombic α-Ln 2 S 3 (Ln = Tb, Dy) compounds are characterized by two successive antiferromagnetic transitions ( T N < 15 K), which can be shifted to either lower or higher temperatures (depending on the crystal orientation) by a magnetic field change, reflecting a strong magnetic anisotropy of the materials .…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, their magnetocaloric effect is reported to be controllable by changing the magnitude and orientation of the magnetic field. FeCr 2 S 4 , CoCr 2 S 4 , and CdCr 2 S 4 compounds are characterized by a second-order magnetic transition at 166, 225, and 87 K, ,, leading to significant magnetic entropy changes of 3.72 J kg –1 K –1 (μ 0 Δ H = 5 T), 3.99 J kg –1 K –1 (μ 0 Δ H = 5 T), and 3.95 J kg –1 K –1 (μ 0 Δ H = 2 T), respectively. Zheng et al showed that the magnetic transition of CoCr 2 S 4 can be shifted to a higher temperature by Cu for Co substitution, allowing to reach a −Δ S M value of 2.57 J kg –1 K –1 for μ 0 Δ H = 5 T at room temperature for the Co 0.4 Cu 0.6 Cr 2 S 4 compound .…”

Section: Introductionmentioning

confidence: 99%

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NaGdS₂: A Promising Sulfide for Cryogenic Magnetic Cooling

et al. 2022

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The development of effective and eco-friendly cooling technology demands an investigation of new magnetocaloric materials. Compounds containing gadolinium are one of the best candidates due to the large spin-only magnetic moment of Gd 3+ ion. This work reports on the magnetocaloric properties of the AGdS2 family (A = Li, Na, K, Rb) in relation to crystal chemistry of these compounds. These sulfides crystallize in two different structure-types: NaCl (A = Li) and -NaFeO2 (A = Na, K, Rb). Although one would expect the larger magnetocaloric effect to be associated to LiGdS2 due to its higher magnetic/non-magnetic mass ratio, our study demonstrates that the NaGdS2 member leads to the best properties among the investigated series. The change of structure from the 3D NaCl structure of LiGdS2 to the layered -NaFeO2 structure of NaGdS2 drastically improves the magnetocaloric properties.Hence, thanks to its structural features associated to negligible exchange interactions, NaGdS2 exhibits a magnetic entropy change up to 54 J kg -1 K -1 at 2.5 K for µ0H = 5 T, which is comparable to the top ranked inorganic Gd-based materials operating in the cryogenic temperature range. These magnetocaloric figures of merit provide evidence that Gd-based sulfides are promising materials for magnetic refrigeration and, more broadly, this highlights the potential of sulfides in that field.

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