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Uspekhi Fizicheskikh Nauk, 2006, Volume 176, Number 7, Pages 745–750
DOI: https://doi.org/10.3367/UFNr.0176.200607d.0745
(Mi ufn339)
 

This article is cited in 45 scientific papers (total in 45 papers)

METHODOLOGICAL NOTES

Metastable phases, phase transformations, and phase diagrams in physics and chemistry

V. V. Brazhkin

Institute for High Pressure Physics, Russian Academy of Sciences
References:
Abstract: Concepts of a ‘phase’ and a ‘phase transition’ are discussed for stable and metastable states of matter. While condensed matter physics primarily considers equilibrium states and treats metastable phases as exceptions, organic chemistry overwhelmingly deals with metastable states. It is emphasized that many simple light-element compounds — including most hydrocarbons; nitrogen oxides, hydrides, and carbides; carbon monoxide CO; alcohols and glycerin — are also metastable at normal pressure in the sense that they do not correspond to a minimum Gibbs free energy for a given chemical composition. At moderate temperatures and pressures, the phase transformations for these metastable phases are reversible with the fulfilment of all laws of equilibrium thermodynamics over the entire range of experimentally accessible times. At sufficiently high pressures ($>$ 1–10 GPa), most of the metastable molecular phases irreversibly transform to lower-energy polymer phases, stable or metastable. These transitions do not correspond to the equality of the Gibbs free energy for the involved phases before and after the transition and so they are not first-order in the 'classical' sense. At normal pressure, the resulting polymer phases can exist at temperatures above the melting point of the original metastable molecular phase, as the examples of polyethylene and polymerized CO dramatically illustrate. As pressure is increased further to 20–50 GPa, the $PV$ contribution to Gibbs free energy gives rise to stable high-density atomic phases. Many of the intermediate-energy polymer phases can likely be synthesized by methods of ‘classical’ chemistry at normal pressure.
English version:
Physics–Uspekhi, 2006, Volume 49, Issue 7, Pages 719–724
DOI: https://doi.org/10.1070/PU2006v049n07ABEH006013
Bibliographic databases:
Document Type: Article
PACS: 05.70.Fh, 05.70.Lh, 64.60.-i
Language: Russian
Citation: V. V. Brazhkin, “Metastable phases, phase transformations, and phase diagrams in physics and chemistry”, UFN, 176:7 (2006), 745–750; Phys. Usp., 49:7 (2006), 719–724
Citation in format AMSBIB
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  • This publication is cited in the following 45 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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