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 dried sample was then calcined in a muffle furnace for 3 hours at 700AdegC, resulting in metastable phase of kaolin (metakaolin).
Zhang, Metastable Phase Equilibrium of Quaternary System [Li.sup.+], [Na.sup.+], [Mg.sup.2+]//[Cl.sup.-] - [H.sub.2]O and Ternary System [Na.sup.+]([K.sup.+]), [Mg.sup.2+]//[C.sup.l-] - [H.sub.2]O at 35[degrees]C, Cheng Du University of Technology, Chengdu, China, 2007.
In other words, analysis from a kinetic viewpoint requires knowledge of the reaction rate that is applicable to real environmental conditions, even for the stable phase, in addition to setting of the metastable phase as an intermediate product [14].
Isotactic polypropylene (iPP) exhibits an interesting polymorphic behavior [1-5], sharing four crystalline structures: monoclinic [alpha]-form [6, 7], trigonal [beta]-form [1, 8-12], triclinic [gamma]-form [13, 14] and smectic phase [15, 16], Among these crystalline forms, [beta]-form is a metastable phase and can only be obtained under the following processing conditions: melt crystallization in the presence of specific heterogeneous nucleating agent (NA) [17, 18], by directional crystallization in certain temperature [19], or from melts subjected to shear [20, 21].
Kuznetsov, "Metastable phase diagram of Ti-Si-N (O) films (C Si< 30 at.%)," Thin Solid Films, vol.
The technology platform synergistically combines physical vapor deposition techniques, together with the exploitation of metastable phase separation in a low-alkali borosilicate glass system, to produce atomically bonded optically transparent nanostructured glass coatings on wide variety of glass platforms.
Slight alteration form yellow--brown gel palagonite, which is in turn a metastable phase and progressively change to colored- anisotropic fibropalagonite (Stronick & Schmincke, 2002) which is a mixture of palagonite with clays (montmorillonite), zeolites and iron and manganese oxyhydroxides (Fig.
Applying CGMD method on DLPE, DLPS, DOPE, DOPS, DLiPE, and DLiPS we demonstrate for the first time the aggregation profile of phospholipid molecules which clearly show the formation of liposome as the metastable phase. These phospholipids have been reported as the main phospholipid component of coconut, sesame, and candlenut endosperm [16] which produced liposomes and planar bilayer during aggregation [2].
The [beta]-phase is considered a metastable phase and the most polar one.
The structures were solved by direct methods from the powder data and were found to be orthorhombic (C[H.sub.3][.sub.2]S[Br.sub.2.5] and monoclinic (C[H.sub.3])[.sub.2]S[Br.sub.4], each containing more bromine than required for the formulation as a metastable phase of (C[H.sub.3])[.sub.2]S[Br.sub.2].
Many experimental phenomena, such as refinement of solidification structure, reduction of the segregation, improvement of the distribution of impurity, the formation of metastable phase and amorphous phase, the growth transformation of eutectic alloy, and soluting trapping [1-5], had been found.
In our case, we chose to use large-sized CIGS particles in a different metastable phase, Wurtzite particles, and then convert them into a Chalcopyrite phase CIGS thin film at higher temperature.