Towards multicaloric effect with ferroelectrics
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Utilizing thermal changes in solid state materials strategically offers caloric-based alternatives to replace current vapor-compression technology. To make full use of multiple forms of the entropy and achieve higher efficiency for designs of cooling devices, the multicaloric effect appears as a cutting-edge concept encouraging researchers to search for multicaloric materials with outstanding caloric properties. Here we report the multicaloric effect in BaTiO3 single crystals driven simultaneously by mechanical and electric fields and described via a thermodynamic phenomenological model. It is found that the multicaloric behavior is mainly dominated by the mechanical field rather than the electric field, since the paraelectric-to-ferroelectric transition is more sensitive to mechanical field than to electric field. The use of uniaxial stress competes favorably with pressure due to its much higher caloric strength and negligible elastic thermal change. It is revealed that multicaloric response can be significantly larger than just the sum of mechanocaloric and electrocaloric effects in temperature regions far above the Curie temperature but cannot exceed this limit near the Curie temperature. Our results also show the advantage of the multicaloric effect over the mechanically-mediated electrocaloric effect or electrically-mediated mechanocaloric effect. Our findings therefore highlight the importance of ferroelectric materials to develop multicaloric cooling.
Liu , Y , Zhang , G , Li , Q , Bellaiche , L , Scott , J F , Dkhil , B & Wang , Q 2016 , ' Towards multicaloric effect with ferroelectrics ' Physical Review. B, Condensed matter and materials physics , vol 94 , no. 21 , 214113 . DOI: 10.1103/PhysRevB.94.214113
Physical Review. B, Condensed matter and materials physics
© 2016, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at journals.aps.org/prb / https://dx.doi.org/10.1103/PhysRevB.94.214113
DescriptionThis work was supported in part by the National Science Foundation (Grant No. CMMI-#1361713) and by DOE Ames Laboratory on “The Caloric Materials Consortium”. L.B. acknowledges the support of ARO Grant No. W911NF-16-1-0227. B.D. acknowledges a public grant overseen by the French National Research Agency (ANR) as part of the “Investissements d’Avenir” program (Grant No. ANR-10-LABX-0035, Labex NanoSaclay) and Fonds National de la Recherche du Luxembourg (FNR) through InterMobility Project No. 16/1159210 “MULTICALOR”.
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