Giant barocaloric effects in formamidinium iodide

Giant barocaloric effects in formamidinium iodide

Blog Article

Barocaloric effect is the thermal response of materials to the external pressures, which provides a promising alternative to the current vapor-compression refrigeration.The effect has been widely observed in a variety of materials.Here, we report giant barocaloric effects in formamidinium iodide [CH(NH2)2I] that was known as the main precursor to synthesize the hybrid perovskite photovoltaic materials.The compound exhibits Ski de fond - Equipement - Fixations - Pieces de rechange two successive phase transitions at 345 and 386 K, where isothermal entropy changes of about 50 J kg−1 K−1 are found under applied pressures below 60 MPa.As for the low-temperature transition with the thermal hysteresis of about 6 K, we obtain a refrigerant capacity of 179 J kg−1 under a pressure change Baby Wrap of 100 MPa and an estimated adiabatic temperature change of about 24 K.

Temperature- and pressure-dependent Raman scattering measurements indicate that the phase transitions and the barocaloric effects are attributed to influences on hydrogen bonds.