Abstract
We present a first evaluation of the potential for spin crossover (SCO) compounds to be considered as a new class of giant mechanocaloric effect materials. From literature data on the variation of the spin crossover temperature with pressure, we estimate the maximum available adiabatic temperature change for several compounds and the relatively low pressures that may be required to observe these effects.
Highlights
Ferroic cooling is a technology in which a solid refrigerant is driven between two states by an applied field.[1]
We present a first evaluation of the potential for spin crossover (SCO) compounds to be considered as a new class of giant mechanocaloric effect materials
The current growth of research into candidate ferroic refrigerants at room temperature has been fuelled by two factors: firstly the promise of device efficiencies that will be greater than those found in gas-based cooling and secondly by environmental concerns over the global warming potential of current hydrofluorocarbon-based refrigerants.[2]
Summary
Ferroic cooling is a technology in which a solid refrigerant is driven between two states by an applied field.[1]. One example is Mn3GaN, an antiferromagnetic metallic antiperovskite in which there is a volume change at the first order Néel transition This transition is sensitive to pressure and so barocaloric effects have been observed.[10] Another is ammonium sulphate, a ferrielectric in which large barocaloric effects have been studied around the first order, ferrielectric transition temperature.[11] In this article we examine the available literature on barocaloric effects in another class of materials—spin crossover (SCO) compounds—in order to assess their mechanocaloric potential. To our knowledge these materials have not previously been considered by the ferroic cooling community
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