Ti2Nb6O12, a novel niobium oxide cluster compound with "Chevrel phase" intercluster connectivity type

被引：17

作者：

Anokhina, EV ^{[1
]}

Essig, MW ^{[1
]}

Day, CS ^{[1
]}

Lachgar, A ^{[1
]}

机构：

[1] Wake Forest Univ, Dept Chem, Winston Salem, NC 27109 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1999年 / 121卷 / 29期

关键词：

D O I：

10.1021/ja990759e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The niobium oxide cluster compound Ti2Nb6O12 was synthesized from NbO, NbO2 and TiO2 in the presence of NaF melt at 950 degrees C. It crystallizes in an original structure type based on octahedral cluster units (Nb6O12i)O-6(a). The clusters connect to each other through outer-inner linkages to form a three-dimensional framework containing cubeoctahedral cavities. The cluster connectivity pattern in Ti2Nb6O12 and intercluster metal-metal distances are similar to those found in the "Chevrel phases". The Ti4+ ions have a distorted octahedral environment formed by the oxide ligands belonging to the clusters. Band structure calculations indicate that the lowest unoccupied band in Ti2Nb6O12 resembles the conduction band in the superconducting "Chevrel phases".

引用

页码：6827 / 6833

页数：7

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