From the two-component system CBrCl3+CBr4 to the high-pressure properties of CBr4.
PARDO, Luis C
Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
Forschungsneutronenquelle Heinz Maier-Leibnitz [FRM II]
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Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
Forschungsneutronenquelle Heinz Maier-Leibnitz [FRM II]
Language
en
Article de revue
This item was published in
Journal of Physical Chemistry B. 2008-11-06, vol. 112, n° 44, p. 13916-22
American Chemical Society
English Abstract
The experimental phase diagram of the CBrCl3+CBr4 system has been determined by means of X-ray powder diffraction and thermal analysis techniques from 200 K to the liquid state. Before melting, the two components have the ...Read more >
The experimental phase diagram of the CBrCl3+CBr4 system has been determined by means of X-ray powder diffraction and thermal analysis techniques from 200 K to the liquid state. Before melting, the two components have the same orientationally disordered (OD) face-centered cubic phase, and solid-liquid equilibrium is explained by simple isomorphism. The application of multiple crossed isopolymorphism formalism to the low-temperature solid-solid equilibria has enabled the inference of an OD rhombohedral metastable (at normal pressure) phase for CBr4. Experimental determination of the pressure-volume-temperature and construction of the pressure-temperature phase diagrams for CBr4 reveal the existence of a high-pressure phase, the rhombohedral symmetry of which is inferred by means of the thermodynamic assessment of the experimental phase diagram and demonstrated by means of high-pressure neutron diffraction measurements. The procedure used in this work confirms the connection between the appearance of metastable phases at normal pressure and their existence at high-pressure.Read less <
Origin
Hal imported