metastable phase

metastable phase

[¦med·ə′stā·bəl ¦fāz]
(physical chemistry)
Existence of a substance as either a liquid, solid, or vapor under conditions in which it is normally unstable in that state.
References in periodicals archive ?
The [beta]-phase is considered a metastable phase and the most polar one.
The Avrami equation was initially developed to describe the decay of a metastable phase to an unique equilibrium and was applied to a wide variety of phenomena (28).
4], each containing more bromine than required for the formulation as a metastable phase of (C[H.
This lower rate does not allow the crystals to reorganize quickly, and hence, a metastable phase is generated once the polymer solidifies.
Although some polymer blends are immiscible because of a very small entropy of mixing and endothermic nature of the reaction, polymer blends with identical chemical structure varying only in molecular weight, such as UHMWPE and HDPE, may show metastable phase separation as a result of differences in their melt viscosity; UHMWPE and HDPE may not have enough time to homogenize completely during melt mixing (31).
A third metastable phase has also been described in the literature.
2% PB60, no further metastable phase crystallization is observed during heating, whereas this blend, without additive, crystallizes only on heating.
At the present level, the facts lead us to hypothesize the presence of a possibly different structure, probably a metastable phase [32].
Therefore one should keep the impurity level as low as possible because an impurity could induce stabilization of metastable phases.
The 10 studies here are largely based on the presentations at a workshop that was called in March 2010 in Brussels in order to assemble and synthesize research findings concerning metastable phases, multistep nucleation, intermediate-mediated self-assembly, and roughing types of transitions that interfere with processes and quality in nanoscale systems.
Ball milling processing technique involves cold welding, fracturing and rewelding of powder particles, which has become an established technique for oxide dispersion strengthened materials and variety of metastable phases [2].
HAZ softening is explained by the coarsening of the metastable phases due to temperature increase during processing.