Electrochemical de-intercalation, oxygen non-stoichiometry, and crystal growth of NaxCoO2-δ

被引：28

作者：

Choua, FC

Abel, ET

Cho, JH

Lee, YS

机构：

[1] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2005年 / 66卷 / 01期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

oxides; superconductors; defects; TGA; crystal growth;

D O I：

10.1016/j.jpcs.2004.08.042

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report a detailed study of de-intercalation of Na from the compound NaxCoO2-delta using an electrochemical technique. We find evidence for stable phases with Na contents near the fractions x similar or equal to 1/3, 1/2, 5/8, 2/3, and 3/4. Details regarding the floating-zone crystal growth of Na0.75CoO2 single crystals are discussed as well as results from magnetic susceptibility measurements. We observe the presence of significant oxygen deficiencies in powder samples of Na0.75CoO2-delta prepared in air, but not in single crystal samples prepared in an oxygen atmosphere. The oxygen deficiencies in a Na0.75CoO2-delta sample with delta similar to 0.08 remain even after electrochemically de-intercalating to Na0.3CoO2-delta. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：155 / 160

页数：6

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