Abstract
The fast growing family of organic–inorganic hybrid compounds has recently been attracting increased attention owing to the remarkable functional properties (magnetic, multiferroic, optoelectronic, photovoltaic) displayed by some of its members. Here we show that these compounds can also have great potential in the until now unexplored field of solid-state cooling by presenting giant barocaloric effects near room temperature already under easily accessible pressures in the hybrid perovskite [TPrA][Mn(dca)3] (TPrA: tetrapropylammonium, dca: dicyanamide). Moreover, we propose that this will not be an isolated example for such an extraordinary behaviour as many other organic–inorganic hybrids (metal-organic frameworks and coordination polymers) exhibit the basic ingredients to display large caloric effects which can be very sensitive to pressure and other external stimuli. These findings open up new horizons and great opportunities for both organic–inorganic hybrids and for solid-state cooling technologies.
Highlights
The fast growing family of organic–inorganic hybrid compounds has recently been attracting increased attention owing to the remarkable functional properties displayed by some of its members
A promising approach is based on solid-state materials exhibiting large caloric effects[1,2,3], and in which the refrigeration capacity is associated with a large isothermal entropy change or with a large adiabatic temperature change induced by different external stimuli[1,2,3,4,5,6], such as mechanical stress—namely, uniaxial strain[7] or hydrostatic pressure8—electric field[9,10], or magnetic field[11,12,13], effects that are enhanced near to phase transitions[4]
What we report in this work is the finding of giant barocaloric effects near room temperature which can be already induced by considerable small pressures (Po0.007 GPa) in a solid of formula
Summary
The fast growing family of organic–inorganic hybrid compounds has recently been attracting increased attention owing to the remarkable functional properties (magnetic, multiferroic, optoelectronic, photovoltaic) displayed by some of its members. We show that these compounds can have great potential in the until now unexplored field of solid-state cooling by presenting giant barocaloric effects near room temperature already under accessible pressures in the hybrid perovskite [TPrA][Mn(dca)3] (TPrA: tetrapropylammonium, dca: dicyanamide). We propose that this will not be an isolated example for such an extraordinary behaviour as many other organic–inorganic hybrids (metal-organic frameworks and coordination polymers) exhibit the basic ingredients to display large caloric effects which can be very sensitive to pressure and other external stimuli. These findings open up new horizons and great opportunities for both organic–inorganic hybrids and for solid-state cooling technologies. They require the application of rather large magnetic fields (H42 T) and are rather expensive magnetic materials, many of them containing rare-earths, drawbacks for the wide industrial and commercial application of the resulting so-called magnetic refrigeration
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