Abstract
Spontaneous voltages were observed in a structure made of poly(vinylidene fluoride-trifluoroethylene) copolymers films sandwiched by metals evaporated onto both surfaces. Open voltages and short-circuit currents were measured as a function of the temperature using different combinations of evaporated metals as electrodes: aluminum, gold, nickel and copper. The ferroelectric-to-paraelectric transition was also observed in such structures for 60:40, 70:30 and 80:20 of VDF/TrFE molar ratios, including the temperature hysteresis characteristic of the first-order transition.
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