Neutron Scattering Studies of the Ferroelectric Transition in P (VDF-TrFE) Copolymers
Schmidt, V. Hugo
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In 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)
Legrand, 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.