Effects of crystal structure on piezoelectric and ferroelectric properties of copoly(vinylidenefluoride-tetrafluoroethylene)

@article{citeulike:1750762, abstract = {Piezoelectricity and ferroelectricity in 80 mol \% vinylidene fluoride/20 mol \% tetrafluoroethylene copolymers (VDF-TFE) were measured at various crystallinities. In order to control the crystallinity, the crystallization pressure was varied from 1 bar to 5 kbar. All the samples prepared by this method contain only form I crystals but with various crystallinity and crystal thickness. Especially, a band structure characterizing an extended chain crystal was observed in the sample crystallized under more than 4 kbar. Remanent polarization (Pr) obtained by the D-E hysteresis curve increases with the crystallinity, and the extrapolated Pr of 126 mC/m2 nearly coincides with the value of 140 mC/m2 calculated from the unit cell dimension and dipole moment. The coercive field (Ec) decreases with the crystallinity. This would be explained by the expansion of intermolecular distance and a decrease in the number of folds, which affect the rotation of dipoles under an electric field. Journal of Applied Physics is copyrighted by The American Institute of Physics.}, author = {Tasaka, Shigeru and Miyata, Seizo }, citeulike-article-id = {1750762}, doi = {10.1063/1.334691}, journal = {Journal of Applied Physics}, keywords = {electrostriction}, number = {3}, pages = {906--910}, posted-at = {2007-10-10 15:12:35}, priority = {2}, publisher = {AIP}, title = {Effects of crystal structure on piezoelectric and ferroelectric properties of copoly(vinylidenefluoride-tetrafluoroethylene)}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=JAPIAU000057000003000906000001\&idtype=cvips\&gifs=yes}, volume = {57}, year = {1985} }

TY - JOUR ID - citeulike:1750762 L3 - citeulike-article-id:1750762 TI - Effects of crystal structure on piezoelectric and ferroelectric properties of copoly(vinylidenefluoride-tetrafluoroethylene) JF - Journal of Applied Physics VL - 57 IS - 3 SP - 906 EP - 910 PB - AIP N2 - Piezoelectricity and ferroelectricity in 80 mol % vinylidene fluoride/20 mol % tetrafluoroethylene copolymers (VDF-TFE) were measured at various crystallinities. In order to control the crystallinity, the crystallization pressure was varied from 1 bar to 5 kbar. All the samples prepared by this method contain only form I crystals but with various crystallinity and crystal thickness. Especially, a band structure characterizing an extended chain crystal was observed in the sample crystallized under more than 4 kbar. Remanent polarization (Pr) obtained by the D-E hysteresis curve increases with the crystallinity, and the extrapolated Pr of 126 mC/m2 nearly coincides with the value of 140 mC/m2 calculated from the unit cell dimension and dipole moment. The coercive field (Ec) decreases with the crystallinity. This would be explained by the expansion of intermolecular distance and a decrease in the number of folds, which affect the rotation of dipoles under an electric field. Journal of Applied Physics is copyrighted by The American Institute of Physics. KW - electrostriction AU - Tasaka, Shigeru AU - Miyata, Seizo PY - 1985/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JAPIAU000057000003000906000001&idtype=cvips&gifs=yes ER -