Synthesis and crystal structure of Na{sub 3}NbO(AsO{sub 4}){sub 2}

Journal Article · Thu Apr 01 00:00:00 EST 1999 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1998.8116· OSTI ID:349922

Hizaoui, K; Jouini, T ^[1]; Jouini, N ^[2]

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1. Faculte des Sciences de Tunis (Tunisia)
2. Univ. de Paris 7 (France). Lab. de Chimie Divisee et Catalyse

The compound Na{sub 3}NbO(AsO{sub 4}){sub 2} was prepared by a solid-state reaction. It crystallizes in the monoclinic system, space group P2{sub 1}/n, with a = 9.637(3) {angstrom}, b = 8.509(2) {angstrom}, c = 10.593(2) {angstrom}, {beta} = 108.67(2){degree}, M = 455.72, V = 822.9(4) {angstrom}{sup 3}, Z = 4, {rho} = 3.687 g cm{sup {minus}3}. The crystal structure was refined (137 variables) from 1440 independent reflections collected on a Nonius CAD4 automatic diffractometer with MoK{alpha} radiation. The final R index and weighted wR index are 0.022 and 0.045, respectively. The three-dimensional network is built up from NbO{sub 6} octahedra and AsO{sub 4} tetrahedra-sharing corners; each NbO{sub 6} octahedron is bonded to five AsO{sub 4} tetrahedra. This arrangement delimits three different tunnels running along [100], [010], and [001], respectively, at the intersection of which the sodium ions are located in a six-coordination model. This structure is compared with those of the A{sub 3}MX{sub 2}O{sub 9} (A = Na, K; M = Nb, Sb; X = P, As).

• OSTI ID: 349922
• Journal Information: Journal of Solid State Chemistry, Vol. 144, Issue 1; Other Information: PBD: Apr 1999
• Country of Publication: United States
• Language: English;French

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
SYNTHESIS
SODIUM OXIDES
NIOBIUM OXIDES
ARSENIC OXIDES
X-RAY DIFFRACTION
LATTICE PARAMETERS
EXPERIMENTAL DATA