Title :
Phase transition investigation in vinylidene fluoride/trifluoroethylene copolymers by thermally stimulated conductivity measurements
Author :
Latour, M. ; Faria, H.M. ; Moreira, R.L.
Author_Institution :
Groupe de Dynamique des Phase Condensees, Montpellier, France
Abstract :
An additional ferroelectric phase transition, beside the well-known ferro-to-paraelectric one, was detected in vinylidene fluoride/trifluoroethylene copolymers by thermally stimulated techniques with the help of a superimposed piezoelectric noise. Differential scanning calorimetry measurements were in agreement with these results. With the initial rise method applied to the glow curves, it was possible to calculate the activation energies of the relaxation connected with both transitions. The authors found 0.73 eV and 0.33 eV, respectively, for the ferro-to-paraelectric and the additional phase transitions
Keywords :
dielectric relaxation; ferroelectric transitions; polymer blends; thermal analysis; thermally stimulated currents; DSC; TSC; activation energies; differential scanning calorimetry; ferroelectric phase transition; glow curves; initial rise method; relaxation; superimposed piezoelectric noise; thermally stimulated conductivity; vinylidene fluoride/trifluoroethylene copolymers; Conductivity measurement; Ferroelectric films; Ferroelectric materials; Integrated circuit noise; Phase detection; Piezoelectric films; Piezoelectric materials; Tellurium; Temperature distribution; Temperature sensors;
Conference_Titel :
Electrets, 1988. (ISE 6) Proceedings., 6th International Symposium on (IEEE Cat. No.88CH2593-2)
Conference_Location :
Oxford
DOI :
10.1109/ISE.1988.38604
