Monoclinic mixed crystals of halogenomethanes CBr4-nCln (n=0,...,4)

Philippe Négrier (1) , Josep Ll Tamarit (2) , María Barrio (2) , Luis C. Pardo (2) , Denise Mondieig (1)

1 CPMOH - Centre de physique moléculaire optique et hertzienne
2 ETSEIB - Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone]

On the basis of the isostructural relationship between the low-temperature monoclinic (C2/c, Z = 32) phases of the halogenomethane CBr4-nCln (n = 0,...,4), a set of mixed crystals has been analysed by means of high-resolution X-ray powder diffraction. It is shown that the monoclinic structure of pure and mixed crystals does not depend of the particularities of the dipolar (or dipole induced) interactions of the pure compound, neither on the composition of the mixed crystal, but on the relative content of the halogen atoms which controls the size of the molecule or the average molecule for the case of mixed crystals.

Mots clés: Mixed crystals; Disorder; Vegard law; Halogenomethanes

Domaines: Cristallographie; Matière Condensée [cond-mat]

Philippe Négrier, Josep Ll Tamarit, María Barrio, Luis C. Pardo, Denise Mondieig. Monoclinic mixed crystals of halogenomethanes CBr4-nCln (n=0,...,4). Chemical Physics, 2007, 336 (2-3), pp.150-156. ⟨10.1016/j.chemphys.2007.06.008⟩. ⟨hal-01553017⟩