Elastocaloric, barocaloric and magnetocaloric effects in spin crossover polymer composite films

Klara Lünser, Eyüp Kavak, Kübra Gürpinar, Baris Emre, Orhan Atakol, Enric Stern-Taulats, Marcel Porta, Antoni Planes, Pol Lloveras, Josep-Lluís Tamarit and Lluís Mañosa ()
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Klara Lünser: Universitat de Barcelona
Eyüp Kavak: Ankara University
Kübra Gürpinar: Ankara University
Baris Emre: Ankara University
Orhan Atakol: Ankara University
Enric Stern-Taulats: Universitat de Barcelona
Marcel Porta: Universitat de Barcelona
Antoni Planes: Universitat de Barcelona
Pol Lloveras: Universitat Politècnica de Catalunya
Josep-Lluís Tamarit: Universitat Politècnica de Catalunya
Lluís Mañosa: Universitat de Barcelona

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-50373-2

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