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Defect induced mechanisms in the ferroelectric-to-paraelectric phase transition of poly(vinylidene fluoride-trifluorethylene) copolymers

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3 Author(s)
Moreira, R.L. ; Groupe de Dynamique des Phases Condensees, Univ. des Sci. et Tech. du Languedoc, Montpellier, France ; Almairac, R. ; Latour, M.

X-ray techniques have been used to study the ferroelectric-to-paraelectric phase transition in poly(vinylidene fluoride-trifluoroethylene) copolymers. Thermal cycles for copolymers with 20 to 40 mol.% trifluoroethylene are presented. A partial hysteresis cycle has been obtained for the 25 mol.% trifluoroethylene sample. Clear evidence of anchoring and memory effects has been demonstrated. It appears that defects play a very important role in the mechanism of the transition. At least some of them are mobile and can relax

Published in:

Electrets, 1988. (ISE 6) Proceedings., 6th International Symposium on (IEEE Cat. No.88CH2593-2)

Date of Conference:

1-3 Sep 1988