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Title: β phase instability in poly(vinylidene fluoride/trifluoroethylene) thin films near β relaxation temperature

The β phase stability in poly(vinylidene fluoride/trifluoroethylene) [P(VDF-TrFE)] thin films was studied below 300 K using X-ray diffraction and polarization-electric-field (P-E) hysteresis loops measurements. On as-grown samples, an irreversible partial order-disorder transformation at T{sub β} ∼ 250 K, namely, the β relaxation temperature, was evidenced by the appearance of an additional X-Ray diffraction peak above T{sub β} as well as changes on the P-E loops on heating after the first cooling. This order-disorder-like transformation which is attributed to an all-trans order to helical disorder transition is suggested to take place in defect-rich regions like crystal-amorphous interphases and/or crystalline areas with randomly distributed TrFE defect-like units.
Authors:
 [1] ;  [2] ;  [3] ; ; ; ;  [4] ; ; ; ; ; ; ; ; ;  [1] ;  [3] ;  [1]
  1. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Yu Tian Road 500, Shanghai 200083 (China)
  2. (SPMS), CentraleSupélec, UMR-8580 CNRS, Université Paris-Saclay, F-92290 Châtenay-Malabry (France)
  3. (China)
  4. Laboratoire Structures, Propriétés et Modélisation des Solides (SPMS), CentraleSupélec, UMR-8580 CNRS, Université Paris-Saclay, F-92290 Châtenay-Malabry (France)
Publication Date:
OSTI Identifier:
22412763
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COOLING; CRYSTALS; ELECTRIC FIELDS; FLUORINATED ALIPHATIC HYDROCARBONS; HYSTERESIS; ORDER-DISORDER TRANSFORMATIONS; PHASE STABILITY; POLARIZATION; POLYVINYLS; RELAXATION; TEMPERATURE DEPENDENCE; THIN FILMS; X-RAY DIFFRACTION