Giant Barocaloric Effect Research Articles

Giant room-temperature barocaloric effect and pressure-mediated electrocaloric effect in BaTiO3 single crystal

Barocaloric effect in BaTiO3 single crystal is studied by a thermodynamic phenomenological model. It is demonstrated that a giant barocaloric effect can be achieved near room temperature with an adiabatic temperature change of more than 3 K and a temperature span about 50 K. As expected, the electrocaloric peak can be shifted towards room temperature by pressure. However, a slight reduction of the electrocaloric peak is found in contrast to relaxor ferroelectrics and LiNbO3. We believe that our findings could open a potential route by combining the barocaloric effect and pressure-mediated electrocaloric effect in BaTiO3 single crystal for cooling devices.

Giant magnetocaloric and barocaloric effects in Mn(As 1− xSb x)

In this work, we discuss the magnetocaloric and barocaloric effects in the doped compound Mn(As 1− x Sb x ), by using a model based in the framework of the band theory. In this model, the two body interaction is treated in the Hartree–Fock approach and the chemical disorder is treated in the coherent potential approximation. Our theoretically calculated magnetocaloric potentials are in very good agreement with the available experimental data. Besides, our theoretical calculations show that the doped compound Mn(As 1− x Sb x ) also exhibits giant barocaloric effect.

Giant solid-state barocaloric effect in the Ni–Mn–In magnetic shape-memory alloy

The search for materials showing large caloric effects close to room temperature has become a challenge in modern materials physics and it is expected that such a class of materials will provide a way to renew present cooling devices that are based on the vapour compression of hazardous gases. Up to now, the most promising materials are giant magnetocaloric materials. The discovery of materials showing a giant magnetocaloric effect at temperatures close to ambient has opened up the possibility of using them for refrigeration. As caloric effects refer to the isothermal entropy change achieved by application of an external field, several caloric effects can take place on tuning different external parameters such as pressure and electric field. Indeed the occurrence of large electrocaloric and elastocaloric effects has recently been reported. Here we show that the application of a moderate hydrostatic pressure to a magnetic shape-memory alloy gives rise to a caloric effect with a magnitude that is comparable to the giant magnetocaloric effect reported in this class of materials. We anticipate that similar barocaloric effects will occur in many giant-magnetocaloric materials undergoing magnetostructural transitions involving a volume change.