Colossal refrigerant capacity in [Fe(hyptrz)3]A2·H2

Driving Barocaloric Effects in a Molecular Spin-Crossover Complex at Low Pressures

“…The large volume change renders SCO transitions sensitive to external pressure, with higher pressures favoring the contracted LS state and lower pressures favoring the expanded HS state . Although several SCO materials have been predicted to exhibit strong barocaloric effects, ,− the exploration of SCO barocaloric materials remains in its infancy, and only two such compounds have been directly characterized through high-pressure calorimetry (Table S2). − Identifying the most promising candidate SCO materials for barocaloric cooling requires a greater understanding of how certain properties of SCO transitionsincluding entropy changes, volume changes, cooperativity, and hysteresisinfluence the magnitude, reversibility, and pressure dependence of barocaloric effects.…”

Structure and thermal property relationships in the thermomaterial di-n-butylammonium tetrafluoroborate for multipurpose cooling and cold-storage

“…In the recent years, barocaloric materials have been demonstrated to exhibit very large thermal changes, some of them as large as Δ S ≥ 100 J K −1 kg −1 (the same order of magnitude as refrigerant gases) under the application of low/moderate pressures of p = 70–1000 bar (while refrigerant gases normally operate at p ≤ 150 bar). 17–34 These barocaloric materials belong to many different families of compounds, such as ammonium or phosphate salts, 35–43 superionic conductors, 44,45 spin crossover materials, 46–52 n -alkanes, 53 hybrid organic–inorganic materials, 54–61 organic plastic crystals 62–69 and polymers. 70–72 Even more recently, barocaloric effects have been combined with gas adsorption/desorption processes in solid-to-solid breathing-transitions in MOFs, giving rise to larger thermal changes of Δ S ∼ 300 J K −1 kg −1 under pressures as small as p ≤ 16 bar.…”

On the colossal barocaloric effect in higher n-alkanes

“…Different types of such materials have been studied recently and exhibit giant or colossal (or supergiant) BC effects, such as plastic crystals, 6–8 elastomeric polymers (elastomers), 9–13 organic–inorganic hybrid perovskites and metal–organic frameworks 14–17 and other coordination compounds. 18–20 Most of the BC materials studied so far present a more pronounced BC effect only around solid–solid phase transitions, while elastomers present a giant BC effect in wider temperature ranges, even in the absence of phase transitions. 9–13 Nevertheless, solid–liquid phase transitions may significantly increase the BC effects, and, consequently, the potential for application in BC-based refrigerators.…”