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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.
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1 Universitat de Barcelona, Departament de Física de la Matèria Condensada, Facultat de Física, Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000 0004 1937 0247)
2 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)
3 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)
4 Ankara University, Department of Engineering Physics, Faculty of Engineering, Ankara, Turkey (GRID:grid.7256.6) (ISNI:0000 0001 0940 9118)
5 Ankara University, Department of Chemistry, Faculty of Science, Ankara, Turkey (GRID:grid.7256.6) (ISNI:0000 0001 0940 9118)
6 Universitat de Barcelona, Departament de Física Quàntica i Astrofísica, Facultat de Física, Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000 0004 1937 0247)
7 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)