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Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H 2 B(pz) 2 ] 2 (bipy)}
Author(s) -
von Ranke Pedro J.,
Alho Bruno P.,
da Silva Pedro H. S.,
Ribas Rafael M.,
Nobrega Eduardo P.,
de Sousa Vínicius S. R.,
Carvalho Alexandre M. G.,
Ribeiro Paula O.
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202100108
Subject(s) - thermodynamics , isothermal process , spin crossover , chemistry , hydrostatic pressure , magnetic refrigeration , refrigeration , condensed matter physics , materials science , physics , crystallography , magnetization , magnetic field , quantum mechanics
Spin crossover complexes have a very striking signature of a huge volume change coupled with low–high spin conversion around a critical temperature, which can be pressure tuned in a large temperature interval. Herein, the barocaloric effect is reported in the spin crossover complex {Fe[H 2 B(pz) 2 ] 2 (bipy)} (bipy = 2,2′‐bipyridine) from theoretical and applied points of view. The experimental data reveal a giant barocaloric effect, through the isothermal entropy change (Δ S T = 83 J kg −1 K −1 ) around T = 273 K, upon moderated hydrostatic pressure variation (Δ P = 2 kbar). The high and linear behavior in the pressure dependence of the phase transition temperature (19 K kbar −1 ) leads to a huge relative cooling power (RCP = 7296 J kg −1 ) upon Δ P = 3 kbar, which is discussed using Ericsson's cooling cycle. Theoretical results, obtained from a microscopic model, updated with the vibration modes from density functional theory (DFT) calculation, show remarkable agreement with the experimental data.