Legrand, J. F.Frick, B.Meurer, B.Schmidt, V. HugoBee, M.Lajzerowicz, J.2016-04-112016-04-111990-09-01Legrand, J. F., B. Frick, B. Meurer, V. H. Schmidt, M. Bee, and J. Lajzerowicz. “Neutron Scattering Studies of the Ferroelectric Transition in P (VDF-TrFE) Copolymers.” Ferroelectrics 109, no. 1 (September 1990): 321–326. doi:10.1080/00150199008211433.0015-0193https://scholarworks.montana.edu/handle/1/9670In P(VDF-TrFE) random copolymers with compositions from 60/40 to 80/20 mol%, the ferroelectric phase transition exhibits a strong first order character and is accompanied by a large expansion of the crystal lattice. In the ferroelectric structure, the polymer chains have an all-trans conformation and are close-packed parallel to one another in a pseudo-hexagonal lattice. According to the m2m symmetry, the spontaneous polarization Py is perpendicular to the chain axis 2. In the paraelectric phase, the structure is disordered : the chains undergo continuous conformational changes, they have a statistical Cm symmetry and the expanded lattice is hexagonal (6/m point group)Neutron Scattering Studies of the Ferroelectric Transition in P (VDF-TrFE) CopolymersArticle