Chérif Saïda Fatma, Hizaoui Khaled, Zid Mohamed Faouzi, Driss Ahmed
Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences, Université de Tunis El Manar, 2092 El Manar Tunis, Tunisia.
Acta Crystallogr Sect E Struct Rep Online. 2012 Apr 1;68(Pt 4):i25-i26. doi: 10.1107/S1600536812010537. Epub 2012 Mar 17.
A new non-centrosymmetric compound, tris-odium tetra-niobium triarsenic nona-deca-oxide, Na(3)Nb(4)As(3)O(19), has been synthesized by a solid-state reaction at 1123 K. The structure consists of AsO(4) tetra-hedra and NbO(6) octa-hedra 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.M(2)XO(13) and M(2)X(2)O(17) (M = transition metal, and X = As or P).
一种新的非中心对称化合物——九氧化三砷四铌三钠(Na₃Nb₄As₃O₁₉),已通过在1123 K下的固态反应合成。其结构由AsO₄四面体和NbO₆八面体通过共用顶点形成一个三维骨架,该骨架包含沿c轴延伸的两种类型的隧道,钠离子位于其中。分别统计占据几个位点的Na⁺阳离子被距离在2.08 (1)至2.88 (4) Å范围内的七个、六个和四个O原子包围。将该标题结构与包含相同基团的结构,即M₂XO₁₃和M₂X₂O₁₇(M = 过渡金属,X = As或P)进行了比较。