The tunnel manganese oxide Na4.32Mn9O18: a new Na+ site discovered by single-crystal X-ray diffraction

被引：21

作者：

Chu, Qingxin ^{[1
]}

Wang, Xiaofeng ^{[1
]}

Li, Qiliang ^{[1
]}

Liu, Xiaoyang ^{[1
]}

机构：

[1] Jilin Univ, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

来源：

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS | 2011年 / 67卷

基金：

中国国家自然科学基金;

关键词：

SODIUM; NA0.44MNO2; INSERTION; ELECTRODE;

D O I：

10.1107/S0108270110052856

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The title compound, tetrasodium nonamanganese octadecaoxide, Na4.32Mn9O18, was synthesized by reacting Mn2O3 with NaCl. One Mn atom occupies a site of 2/m symmetry, while all other atoms sit on mirror planes. The compound is isostructural with Na4Ti4Mn5O18 and suggestive of Mn3+/Mn4+ charge ordering. It has a double-tunnel structure built up from double and triple chains of MnO6 octahedra and single chains of MnO5 square pyramids by corner sharing. Disordered Na+ cations occupy four crystallographic sites within the tunnels, including an unexpected new Na+ site discovered inside the large S-shaped tunnel. A local-ordering model is used to show the possible Na+ distribution, and the unit-cell evolution during charging/discharging is explained on the basis of this local-ordering model.

引用

页码：I10 / I12

页数：3

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