4 research outputs found
Onset of rigidty in glasses: from random to self-organized networks
We review in this paper the signatures of a new elastic phase that is found
in glasses with selected compositions. It is shown that in contrast with random
networks, where rigidity percolates at a single threshold, networks that are
able to self-organize to avoid stress will remain in an almost stress- free
state during a compositional interval, an intermediate phase, that is bounded
by a flexible phase and a stressed rigid phase. We report the experimental
signatures and describe the theoretical efforts that have been accomplished to
characterize the intermediate phase. We illustrate one of the methods used in
more detail with the example of Group III chalcogenides and finally suggest
further possible experimental signatures of self-organization.Comment: 27 pages, 6 figures, Proceedings of the Conference on Non-Crystalline
Materials 10, to appear in Journal of Non-Crystalline Solid
Rings and rigidity transitions in network glasses
Three elastic phases of covalent networks, (I) floppy, (II) isostatically
rigid and (III) stressed-rigid have now been identified in glasses at specific
degrees of cross-linking (or chemical composition) both in theory and
experiments. Here we use size-increasing cluster combinatorics and constraint
counting algorithms to study analytically possible consequences of
self-organization. In the presence of small rings that can be locally I, II or
III, we obtain two transitions instead of the previously reported single
percolative transition at the mean coordination number , one from a
floppy to an isostatic rigid phase, and a second one from an isostatic to a
stressed rigid phase. The width of the intermediate phase and the
order of the phase transitions depend on the nature of medium range order
(relative ring fractions). We compare the results to the Group IV
chalcogenides, such as Ge-Se and Si-Se, for which evidence of an intermediate
phase has been obtained, and for which estimates of ring fractions can be made
from structures of high T crystalline phases.Comment: 29 pages, revtex, 7 eps figure