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Title: Giant and Reversible Barocaloric Effect in Trinuclear Spin-Crossover Complex Fe3(bntrz)6(tcnset)6
Author: Romanini, Michela
Wang, Y.
Gurpinar, K.
Ornelas, G.
Lloveras, P.
Zhang, Z.
Zheng, W.
Barrio, M.
Aznar, A.
Gràcia-Condal, Adrià
Emre, B.
Popescu, C.
Zhang, H.
Long, Y.
Balicas, L.
Tamarit, J. Ll.
Planes Vila, Antoni
Shatruk, M.
Mañosa, Lluís
Keywords: Ciència dels materials
Propietats magnètiques
Materials science
Magnetic properties
Issue Date: Feb-2021
Publisher: Wiley-VCH
Abstract: A giant barocaloric effect (BCE) in a molecular material Fe3(bntrz)6(tcnset)6 (FBT) is reported, where bntrz = 4-(benzyl)-1,2,4-triazole and tcnset = 1,1,3,3-tetracyano-2-thioethylepropenide. The crystal structure of FBT contains a trinuclear transition metal complex that undergoes an abrupt spin-state switching between the state in which all three FeII centers are in the high-spin (S = 2) electronic configuration and the state in which all of them are in the low-spin (S = 0) configuration. Despite the strongly cooperative nature of the spin transition, it proceeds with a negligible hysteresis and a large volumetric change, suggesting that FBT should be a good candidate for producing a large BCE. Powder X-ray diffraction and calorimetry reveal that the material is highly susceptible to applied pressure, as the transition temperature spans the range from 318 at ambient pressure to 383 K at 2.6 kbar. Despite the large shift in the spin-transition temperature, its nonhysteretic character is maintained under applied pressure. Such behavior leads to a remarkably large and reversible BCE, characterized by an isothermal entropy change of 120 J kg−1 K−1 and an adiabatic temperature change of 35 K, which are among the highest reversible values reported for any caloric material thus far.
Note: Versió postprint del document publicat a:
It is part of: Advanced Materials, 2021, vol. 33, p. 1-9
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ISSN: 0935-9648
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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