Affiliation: | aLaboratoire de Chimie Inorganique Structurale, SUPRATECS, Department of Chemistry, Chemistry Inst. B6, University of Liège, Sart-Tilman, B-4000 Liège, Belgium bPhysique Statistique et des Matériaux, SUPRATECS, Department of Physics, Physics Inst. B5, University of Liège, Sart Tilman, B-4000 Liège, Belgium |