Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C10H21NH3)2MnCl4 under Low Pressure Near Room Temperature

Barocaloric effects in a layered hybrid organic-inorganic compound, (C10H21NH3)(2)MnCl4, that are reversible and colossal under pressure changes below 0.1 GPa are reported. This barocaloric performance originates in a phase transition characterized by different features: A strong disordering of the organic chains, a very large volume change, a very large sensitivity of the transition temperature to pressure and a small hysteresis. The obtained values are unprecedented among solid-state cooling materials at such low pressure changes and demonstrate that colossal effects can be obtained in compounds other than plastic crystals. The temperature-pressure phase diagram displays a triple point indicating enantiotropy at high pressure.

Automated summary

Barocaloric effects in a layered hybrid organic-inorganic compound (C10H21NH3)(2)MnCl4, which are reversible and colossal under pressure changes below 0.1 GPa, are reported. These effects are attributed to a phase transition characterized by features such as strong disordering of organic chains, a large volume change, high sensitivity of transition temperature to pressure, and small hysteresis. The obtained values are unprecedented for solid-state cooling materials at low pressure changes, indicating that colossal effects can be achieved in compounds other than plastic crystals.