Abstract

Giant barocaloric effects were recently reported for spin-crossover materials. The volume change in these materials suggests that the transition can be influenced by uniaxial stress, and give rise to giant elastocaloric properties. However, no measurements of the elastocaloric properties in these compounds have been reported so far. Here, we demonstrated the existence of elastocaloric effects associated with the spin-crossover transition. We dissolved particles of ([Fe(L)2](BF4)2, [L=2,6di(pyrazol-1-yl)pyridine]) into a polymeric matrix. We showed that the application of tensile uniaxial stress to a composite film resulted in a significant elastocaloric effect. The elastocaloric effect in this compound required lower applied stress than for other prototype elastocaloric materials. Additionally, this phenomenon occurred for low values of strain, leading to coefficient of performance of the material being one order of magnitude larger than that of other elastocaloric materials. We believe that spin-crossover materials are a good alternative to be implemented in eco-friendly refrigerators based on elastocaloric effects.

Spin-crossover materials are promising for caloric cooling, but their powder nature prevents exploring elastocaloric properties. Here, the authors propose spin-crossover polymer composites with giant elastocaloric effects.

Details

Title
Elastocaloric, barocaloric and magnetocaloric effects in spin crossover polymer composite films
Author
Lünser, Klara 1   VIAFID ORCID Logo  ; Kavak, Eyüp 2   VIAFID ORCID Logo  ; Gürpinar, Kübra 3   VIAFID ORCID Logo  ; Emre, Baris 4   VIAFID ORCID Logo  ; Atakol, Orhan 5 ; Stern-Taulats, Enric 1   VIAFID ORCID Logo  ; Porta, Marcel 6   VIAFID ORCID Logo  ; Planes, Antoni 1   VIAFID ORCID Logo  ; Lloveras, Pol 7   VIAFID ORCID Logo  ; Tamarit, Josep-Lluís 7   VIAFID ORCID Logo  ; Mañosa, Lluís 1   VIAFID ORCID Logo 

 Universitat de Barcelona, Departament de Física de la Matèria Condensada, Facultat de Física, Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000 0004 1937 0247) 
 Ankara University, Department of Engineering Physics, Faculty of Engineering, Ankara, Turkey (GRID:grid.7256.6) (ISNI:0000 0001 0940 9118); Ankara University, Graduate School of Natural and Applied Sciences, Ankara, Turkey (GRID:grid.7256.6) (ISNI:0000 0001 0940 9118) 
 Ankara University, Graduate School of Natural and Applied Sciences, Ankara, Turkey (GRID:grid.7256.6) (ISNI:0000 0001 0940 9118); Ankara University, Department of Chemistry, Faculty of Science, Ankara, Turkey (GRID:grid.7256.6) (ISNI:0000 0001 0940 9118) 
 Ankara University, Department of Engineering Physics, Faculty of Engineering, Ankara, Turkey (GRID:grid.7256.6) (ISNI:0000 0001 0940 9118) 
 Ankara University, Department of Chemistry, Faculty of Science, Ankara, Turkey (GRID:grid.7256.6) (ISNI:0000 0001 0940 9118) 
 Universitat de Barcelona, Departament de Física Quàntica i Astrofísica, Facultat de Física, Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000 0004 1937 0247) 
 Universitat Politècnica de Catalunya, Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, EEBE, Barcelona, Spain (GRID:grid.6835.8) (ISNI:0000 0004 1937 028X) 
Pages
6171
Publication year
2024
Publication date
2024
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3083308584
Copyright
© The Author(s) 2024. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.