Synthesis, crystal structure and spectroscopic characterization of a new cadmium phosphate, Na2Cd5(PO4)4

Teycir Ben Hamed (1) , Amal Boukhris (1) , Benoit Glorieux (2) , Mongi Ben Amara (1)

1 Matériaux Inorganiques
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

A novel cadmium phosphate compound Na2Cd5(PO4)4 was synthesized in single crystal and in powder forms using flux and Pechini methods, respectively. It was then characterized by single crystal X-ray diffraction, vibrational spectroscopy and photoluminescence measurements. This compound crystallizes in the monoclinic system with space group P21/a, lattice parameters a = 8.276(1) Å, b = 9.301(3) Å, c = 9.455(2) Å, β = 111.82 (1)° and Z = 2. The structure consists of (Na3/4,Cd1/4)O7, (Cd3/4,Na1/4)O6 and CdOx (x = 6, 7), polyhedra and PO4 tetrahedra linked through common corners or edges giving rise to a novel type of complex three-dimensional framework. This structure could be described in terms of [(Na3/4,Cd1/4)2(Cd3/4,Na1/4)2Cd3O16]∞ layers stacked parallel to the (2 0–3) plane and interconnected both directly and via PO4 tetrahedra by sharing common corners and edges. Vibrational spectroscopy and cadmium photoluminescence were analyzed according to the structural results.

Domaines: Matériaux

Teycir Ben Hamed, Amal Boukhris, Benoit Glorieux, Mongi Ben Amara. Synthesis, crystal structure and spectroscopic characterization of a new cadmium phosphate, Na2Cd5(PO4)4. Journal of Molecular Structure, 2020, 1199, 126963 (10 p.). ⟨10.1016/j.molstruc.2019.126963⟩. ⟨hal-02286674⟩