Defect model for the mixed mobile ion effect revisited: an importance of deformation rates

Details Defect model for the mixed mobile ion effect revisited: an importance of deformation rates Defect model for the mixed mobile ion effect revisited: an importance of deformation rates

2009-03-04

arxiv.org/abs/0903.0848v1

Physics

Condensed Matter

Materials Science

6 pages, 1 figure, 1 table

Scientific paper

The progress in understanding the behavior of glassy mixed ionic conductors within the concept of the defect model for the mixed mobile ion effect (V. Belostotsky, J. Non-Cryst. Solids 353 (2007) 1078) is reported. It is shown that in a mixed ionic conductor (e.g., mixed alkali glass) containing two or more types of dissimilar mobile ions of unequal size sufficient local strain arising from the size mismatch of a mobile ion entering a foreign site can not be, in principle, absorbed by the surrounding network-forming matrix without its damage. Primary site rearrangement occurs immediately, on the time scale close to that of the ion migration process, through the formation of intrinsic defects in the nearest glass network. Neither anelastic relaxation below glass transition temperature, Tg, nor viscoelastic or viscous behavior at or above Tg can be expected being observed in this case because the character of the stress relaxation in a wide temperature range is dictated above all by the deformation rates employed locally to the adjacent network-forming matrix. Since the ion migration occurs on the picosecond time scale, the primary rearrangement of the glass network adjacent to an ionic site occurs at rates orders of magnitude higher than those of the critical minimum values, so the matrix demonstrates brittle-elastic response to the arising strain even at temperatures well above Tg, which explains, among other things, why mixed alkali effect is observable in glass melts.

Affiliated with

Also associated with

No associations

Rating

Defect model for the mixed mobile ion effect revisited: an importance of deformation rates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Defect model for the mixed mobile ion effect revisited: an importance of deformation rates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Defect model for the mixed mobile ion effect revisited: an importance of deformation rates will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-114151