Inverse Electrocaloric Properties of P(VDF‐TrFE) and P(VDF‐TrFE)/BZCT Composites: Temperature and Field Dependence

This study investigates the electrocaloric effect (ECE) in a poly(vinylidenefluoride‐trifluoroethylene) (P(VDF‐TrFE) (70/30)) copolymer, as well as and its 0–3 composites with containing 10 and 20 vol% of Ba(Ca, Zr, Ti)O 3 (BZCT) as ceramic fillers, including a ternary variant with 2 vol% of polyaniline (PANI). The films were prepared by solution casting and characterized by using X‐ray diffraction (XRD), Fourier‐transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), dielectric measurements, and polarization‐electric (P–E) hysteresis loops. Indirect ECE analysis revealed negative adiabatic temperature changes (Δ T ), peaking at −11 K at 25°C for pure P(VDF‐TrFE), −4.5 K at 75°C for 10 vol% BZCT, and −9.0 K at 60°C for 10 vol% BZCT/PANI under 1200 kV/cm electric fields of 1200 kV/cm. The observed shifts in peak Δ T are attributed to thermal hysteresis, interfacial polarization, strain‐mediated coupling, and the conductivity‐enhancing charge mobility of PANI. These lead‐free composites demonstrate the potential for energy‐efficient and, compact cooling technologies.