Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1295553 | Solid State Ionics | 2006 | 4 Pages |
Abstract
High pressure conductivity measurements have been carried out on P(EO)20LiBETI from 295Â K to 368Â K. The decrease of electrical conductivity with pressure is larger in the partially crystalline phase (low temperature and low pressure or high temperature and high pressure) than in the fully amorphous phase (high temperature and low pressure). It is found that if the phase transition is approached from the crystalline phase (decreasing pressure), the pressure of the phase transition varies from 0 to 0.23Â GPa as the temperature increases from 336Â K to 358Â K. The shift of the phase transition temperature with pressure is approximately the same as the shift of the glass transition temperature with pressure for pure PEO. This can be understood in terms of the defect diffusion model. If the material is above 336Â K and is in the fully amorphous phase, after pressure is increased above the critical pressure, the material remains in the amorphous phase for extended periods of time before transforming to the partially crystalline phase. This is reminiscent of a super-pressed state but may be an indication of slow crystallization kinetics.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
K.R. Booher, S. Passerini, C.A. Edmondson, J.J. Fontanella,