A NIOBIUM PHOSPHATE BRONZE CLOSELY RELATED TO THE BA3NB6SI4O26 STRUCTURE - NA6NB8P5O35

被引：13

作者：

BENABBAS, A ^{[1
]}

BOREL, MM ^{[1
]}

GRANDIN, A ^{[1
]}

LECLAIRE, A ^{[1
]}

RAVEAU, B ^{[1
]}

机构：

[1] ISMRA UNIV,CRISTALLOG & SCI MAT LAB,CAMPUS 2,BLVD MARECHAL JUIN,F-14050 CAEN,FRANCE

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1991年 / 92卷 / 01期

关键词：

D O I：

10.1016/0022-4596(91)90241-9

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A new niobium "bronze" Na6Nb8P5O35 has been isolated, the structure of which has been determined from a single crystal by X-ray diffraction. This oxide crystallizes in the space group R32, a = 8.9185 (5) Å and c = 30.055 (11) Å. The mixed framework built up from corner sharing NbO6 octahedra and single PO4 tetrahedra can be described by the stacking along c of tetrahedral [P3O6]∞ layers and [Nb8P2O29]∞ layers. The latters are closely related to the Ba3Nb6Si4O26 structure since they present identical [Nb6O27] units with identical orientations leading to a similar "a" parameter; those units are linked through single PO4 tetrahedra and NbO6 octahedra instead of Si2O7 groups in the siliconiobate. The similarity with the structure of K3Nb8O21 is also discussed. Attention is drawn to the existence of wide circular galleries where Na+ ions can move freely, suggesting possible ionic conductivity. The name of "bronze" for this phase is discussed taking into account the bond valence calculation which suggests a localization of the electrons. © 1991.

引用

页码：51 / 56

页数：6

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