Synthèse et étude structurale d’un composé non-centrosymétrique : NaNi4(AsO4)3
Written by sctunisie no commentsThe sodium tetranickel triarsenate NaNi4(AsO4)3 crystallizes in the tetragonal system, space group I 4 2d (N° 122). The parameters of the unit cell are: a = 6.7863(2)Å, c = 18.682(2)Å, Z = 4, ρc = 5.208 Mg.m-3. The structure consists of a three-dimensional framework made of AsO4 tetrahedra and NiO6 octahedra sharing edges and corners. This closed framework delimits cavities wherein Na ions are located. The double NaNi4(PO4)3 orthophosphate although analogous in composition, is fundamentally different in structure from the arsenate studied. The later compound exhibits the Namg4(VO4)3 structure.
R. Ben Smail, M.F. Zid, T. Jouini
Arsenate, nickel, crystal structure
Pages 1665-1673
