Synthesis and crystal structure of Na3.5Cr1.5Co0.5(PO4)3 phosphate

Authors :: Jean-Pierre Chaminade
Mohamed Chakir
Abdelaziz El Jazouli
Laboratoire de Chimie des Matériaux Solides
Faculté des Sciences Ben M'sik [Casablanca]
Université Hassan II [Casablanca] (UH2MC)-Université Hassan II [Casablanca] (UH2MC)
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB)
Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB)
Source :: Powder Diffraction, Powder Diffraction, Cambridge University Press (CUP), 2006, vol. 21, n° 3, p. 210-213. ⟨10.1154/1.2190689⟩
Publication Year :: 2006
Publisher :: Cambridge University Press (CUP), 2006.
Abstract: A new Nasicon phosphates series [Na3+xCr2−xCox(PO4)3(0⩽x⩽1)] was synthesized by a coprecipitation method and structurally characterized by powder X-ray diffraction. The selected compound Na3.5Cr1.5Co0.5(PO4)3 (x=0.5) crystallizes in the R3c space group with the following hexagonal unit-cell dimensions: ah=8.7285(3) Å, ch=21.580(2) Å, V=1423.8(1) Å3, and Z=6. This three-dimensional framework is built of PO4 tetrahedra and Cr∕CoO6 octahedra sharing corners. Na atoms occupy totally M(1) sites and partially M(2) sites.