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Polymorphism of CBr2Cl2

hal.structure.identifierDepartament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
dc.contributor.authorBARRIO, María
hal.structure.identifierDepartament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
dc.contributor.authorTAMARIT, Jose Luis
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorNÉGRIER, Philippe
hal.structure.identifierDepartament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
dc.contributor.authorPARDO, Luis C.
hal.structure.identifierDepartament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
dc.contributor.authorVEGLIO, Nestor
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorMONDIEIG, Denise
dc.date.created2007-06-11
dc.date.issued2008-02
dc.identifier.issn1144-0546
dc.description.abstractEnThe polymorphism of dibromodichloromehtane (CBr2Cl2) has been studied by means of a wide set of experimental techniques as a function of temperature and pressure. From the p - V - T diagram and the derived p - T diagram the volume variations at the transition points have been calculated and compared with those obtained by means of X-ray and neutron powder diffraction. By combining the experimental techniques, it has been demonstrated the existence of a high-pressure orientationally disordered rhombohedral phase (a(R)approximate to 14.6 +/- 0.3 angstrom and a alpha approximate to 89.2 +/- 0.2 degrees). The existence of a glass transition within the monoclinic (C2/c, Z=32) low-temperature ordered phase associated with the freezing of exchange positions between Cl and Br atoms is analyzed considering the asymmetry of the intermolecular interactions by means of the study of the thermal expansion tensor. The change of the derivative of the aspherism index, previously reported as a possible "fingerprint'' for this kind of glass transitions, is found.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.enPolymorphism of CBr2Cl2
dc.typeArticle de revue
dc.identifier.doi10.1039/b708757h
bordeaux.journalNew Journal of Chemistry
bordeaux.page232-239
bordeaux.volume32
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-00719368
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00719368v1
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