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231226s2022 xx |||||o 00| ||eng c |
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|a 10.1021/acs.chemmater.2c00261
|2 doi
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|a pubmed24n1136.xml
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|a eng
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|a Koskelo, EliseAnne C
|e verfasserin
|4 aut
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|a Free-Spin Dominated Magnetocaloric Effect in Dense Gd3+ Double Perovskites
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|c 2022
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 19.05.2022
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2022 American Chemical Society.
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|a Frustrated lanthanide oxides with dense magnetic lattices are of fundamental interest for their potential in cryogenic refrigeration due to a large ground state entropy and suppressed ordering temperatures but can often be limited by short-range correlations. Here, we present examples of frustrated fcc oxides, Ba2GdSbO6 and Sr2GdSbO6, and the new site-disordered analogue Ca2GdSbO6 ([CaGd] A [CaSb] B O6), in which the magnetocaloric effect is influenced by minimal superexchange (J 1 ∼ 10 mK). We report on the crystal structures using powder X-ray diffraction and the bulk magnetic properties through low-field susceptibility and isothermal magnetization measurements. The Gd compounds exhibit a magnetic entropy change of up to -15.8 J/K/molGd in a field of 7 T at 2 K, a 20% excess compared to the value of -13.0 J/K/molGd for a standard in magnetic refrigeration, Gd3Ga5O12. Heat capacity measurements indicate a lack of magnetic ordering down to 0.4 K for Ba2GdSbO6 and Sr2GdSbO6, suggesting cooling down through the liquid 4-He regime. A mean-field model is used to elucidate the role of primarily free-spin behavior in the magnetocaloric performance of these compounds in comparison to other top-performing Gd-based oxides. The chemical flexibility of the double perovskites raises the possibility of further enhancement of the magnetocaloric effect in the Gd3+ fcc lattices
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|a Journal Article
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|a Liu, Cheng
|e verfasserin
|4 aut
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|a Mukherjee, Paromita
|e verfasserin
|4 aut
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|a Kelly, Nicola D
|e verfasserin
|4 aut
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| 700 |
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|a Dutton, Siân E
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Chemistry of materials : a publication of the American Chemical Society
|d 1998
|g 34(2022), 7 vom: 12. Apr., Seite 3440-3450
|w (DE-627)NLM098194763
|x 0897-4756
|7 nnns
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|g volume:34
|g year:2022
|g number:7
|g day:12
|g month:04
|g pages:3440-3450
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|u http://dx.doi.org/10.1021/acs.chemmater.2c00261
|3 Volltext
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