Influence of texturing conditions for copolymer films of vinylidenefluoride/tetrafluoroethylene on remnant polarization and strain-induced structural transformations

Abstract

In ferroelectric films of vinylidenefluoride with 6 mol. % tetrafluoroethylene copolymers values remnant P/sub r/ and maximum P/sub s/ polarization depends on temperature of uniaxial drawing T/sub d/. Films with lower T/sub d/ have high magnitudes of P/sub r/ and P/sub s/. Data of IR spectroscopy, small-angle X-ray diffraction SAXS and ultrasonic relaxation show that the drawing realized at lower temperatures leads to higher concentrations of conformations of planar zigzag and increases their degree of orientation. Approaching to "ideal monocrystall" texture is a necessary condition to obtain high ferroelectric and piezoelectric characteristics in such systems.