Research Article: Non-centrosymmetric Na3Nb4As3O19

Date Published: April 01, 2012

Publisher: International Union of Crystallography

Author(s): Saïda Fatma Chérif, Khaled Hizaoui, Mohamed Faouzi Zid, Ahmed Driss.

http://doi.org/10.1107/S1600536812010537

Abstract

A new non-centrosymmetric compound, tris­odium tetra­niobium triarsenic nona­deca­oxide, Na3Nb4As3O19, has been synthesized by a solid-state reaction at 1123 K. The structure consists of AsO4 tetra­hedra and NbO6 octa­hedra sharing corners to form a three-dimensional framework containing two types of tunnels running along the c axis, in which the sodium ions are located. Na+ cations occupying statistically several sites, respectively, are surrounded by seven, six and four O atoms at distances ranging from 2.08 (1) to 2.88 (4) Å. The title structure is compared with those containing the same groups, viz.M2XO13 and M2X2O17 (M = transition metal, and X = As or P).

Partial Text

For physical properties of this class of compound, see: Masquelier et al. (1995 ▶); Daidouh et al. (1997 ▶, 1998 ▶, 1999 ▶); Sanz et al. (1999 ▶, 2001 ▶); Baies et al. (2006 ▶); Ravez et al. (1972 ▶, 1974 ▶); Torardi et al. (1985 ▶); Krol et al. (1980 ▶); Blasse et al. (1992 ▶). For synthetic details, see: Zid et al. (1988 ▶, 1989 ▶); Ben Amor & Zid (2005 ▶, 2006 ▶); Hizaoui et al. (1999a ▶, b ▶); Haddad et al. (1988 ▶); Harrison et al. (1994 ▶); Chérif et al. (2011 ▶). For related structures, see: Guyomard et al. (1991 ▶); Serra & Hwu (1992 ▶); Ben Amor & Zid (2006 ▶); Ledain et al. (1996 ▶); Leclaire et al. (1994 ▶); Amos & Sleight (2001 ▶). For details of the bond-valences method, see: Brown & Altermatt, (1985 ▶).

 

Source:

http://doi.org/10.1107/S1600536812010537