Phenomenological analysis of elastocaloric effect in ferroelectric poly(vinylidene fluoride-trifluoroethylene) copolymers
In this work, based on thermodynamic theory, we theoretically derived the elastocaloric coefficient at the zero electric field, including the first kind of elastocaloric coefficient at constant polarization and the second kind of elastocaloric coefficient arising from the piezoelectric effect. In ad...
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Veröffentlicht in: | Journal of applied physics 2019-10, Vol.126 (16) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In this work, based on thermodynamic theory, we theoretically derived the elastocaloric coefficient at the zero electric field, including the first kind of elastocaloric coefficient at constant polarization and the second kind of elastocaloric coefficient arising from the piezoelectric effect. In addition, using the Landau-Ginzburg-Devonshire approach, we predicted a giant elastocaloric effect in poly(vinylidene fluoride-trifluoroethylene) [P(VEF-TrFE)] copolymer films with a large elastocaloric strength, which is one or two orders of magnitude larger than typical elastocaloric materials reported in the literature. The adiabatic elastocaloric temperature change is found to be huge [∼32.2 K for P(VEF-TrFE) 65/35 and 65 K for P(VEF-TrFE) 70/30] under a uniaxial compressive stress (−100 MPa) due to negative piezoelectricity. Moreover, even a low tensile stress (∼15 MPa) can induce a modest elastocaloric effect (∼−1.3 K), which is in good agreement with the previous literature [Patel et al., Appl. Phys. Lett. 108, 072903 (2016)]. Our study not only stimulates further investigations on elastocaloric effects in ferroelectric polymers but also offers opportunities for elastocaloric solid-state refrigeration. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.5124901 |