Source:
NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS, Volume 97, Number 1-4, p.292-294 (1995)
Abstract:
Results for the local structure of polymer electrolytes based on
poly(ethylene oxide), PEG, containing CoBr2 salts at different
concentrations are discussed. The use of different drying procedures
which can result in a mixed morphology film containing both amorphous
and crystalline regions (spherulites) has been investigated. The EXAFS
results show that each cobalt (on average) is associated with 4 oxygens
and 3 bromines for all concentrations and drying regimes. The Co-O
distance was found to be similar for most of the samples at similar to
2.110 Angstrom but this distance reduces slightly for the more dilute
samples, indicating a possible greater interaction between the polymer
chains and the cations. The Co-Br distance remains constant at similar
to 2.380 Angstrom for all drying regimes and concentrations.
