Abstract
The electrocaloric effect (ECE) of poly (vinyledene fluoride- trifluoroethylene) (P(VDF-TrFE)) 55/45 mol% copolymers was directly measured, which confirms the results deduced from Maxwell relation. The adiabatic temperature change δT under a given electric field peaks at the ferroelectric-paraelectric (FE-PE) transition. Away from it, ECE becomes small. δT versus applied electric field can be described well by a modified Belov- Goryaga equation. The ECE in ferroelectric polymers, especially near FE-PE transition where larger ECE is observed, are analyzed under different boundary conditions employing phenomenological theory and constitutive equations. The secondary pyroelectricity is found to play a significant role which enhances ECE in ferroelectric polymers.
Original language | English (US) |
---|---|
Pages (from-to) | 559-566 |
Number of pages | 8 |
Journal | Applied Physics A: Materials Science and Processing |
Volume | 107 |
Issue number | 3 |
DOIs | |
State | Published - Jun 2012 |
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Materials Science