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      The Elastocaloric Effect: A Way to Cool Efficiently

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          Caloric materials near ferroic phase transitions.

          A magnetically, electrically or mechanically responsive material can undergo significant thermal changes near a ferroic phase transition when its order parameter is modified by the conjugate applied field. The resulting magnetocaloric, electrocaloric and mechanocaloric (elastocaloric or barocaloric) effects are compared here in terms of history, experimental method, performance and prospective cooling applications.
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            The Magnetocaloric Effect and its Applications

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              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.
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                Author and article information

                Journal
                Advanced Energy Materials
                Adv. Energy Mater.
                Wiley-Blackwell
                16146832
                July 2015
                July 2015
                : 5
                : 13
                : 1500361
                Article
                10.1002/aenm.201500361
                26190957
                dd3c5128-d737-4d2a-a963-735ad124880a
                © 2015

                http://doi.wiley.com/10.1002/tdm_license_1.1

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