Synthesis of La2-xNiO4+δ oxides by polymeric route:: non-stoichoimetry control

被引：22

作者：

Fontaine, ML ^{[1
]}

Laberty-Robert, C ^{[1
]}

Barnabé, A ^{[1
]}

Ansart, F ^{[1
]}

Tailhades, P ^{[1
]}

机构：

[1] Univ Toulouse 3, UMR 5085, LCMIE, CIRIMAT, F-31062 Toulouse 04, France

来源：

CERAMICS INTERNATIONAL | 2004年 / 30卷 / 08期

关键词：

sol-gel processes; defects; grain size; ionic conductivity; fuel cells;

D O I：

10.1016/j.ceramint.2003.11.013

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The synthesis of La2-xNiO4+delta oxides has been done via a polymeric route. This method allows the preparation of a wide range of non-stoichoimetry values. Oxides with values as high as 0.25 have been synthesised. Correlations between processing parameters such as sol composition and heat treatment have been done with structural and microstructural properties of the oxides. In our synthesis conditions, the higher the mean grain size, the higher the non-stoichoimetry level. Transmission electron microscopy on these oxides has shown that whatever the non-stoichoimetry level, the extra-oxygen arranges in the structure according to two superstructures which correspond to delta = 0.25 and delta = 0.17. This shows that our grains consist of a mixture of these compositions. (C) 2004 Elsevier Ltd and Techna S.r.l. All rights reserved.

引用

页码：2087 / 2098

页数：12

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