Effect of layer charge modification for Co-A1 layered double hydroxides:: study by X-ray absorption spectroscopy

被引：52

作者：

Leroux, F ^{[1
]}

Moujahid, E ^{[1
]}

Taviot-Guého, C ^{[1
]}

Besse, JP ^{[1
]}

机构：

[1] Univ Clermont Ferrand 2, CNRS UPRES A 6002, Lab Mat Inorgan, F-63177 Clermont Ferrand, France

来源：

SOLID STATE SCIENCES | 2001年 / 3卷 / 1-2期

关键词：

layered double hydroxides; mean oxidatian state; UV-visible spectroscopy; X-ray absorption spectroscopy; cation local order;

D O I：

10.1016/S1293-2558(00)01119-5

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

When tuning the exchange capacity of a Co2+, Al3+ containing layered double hydroxyde's (LDH's) material, a concomitant phenomenon of oxidation-migration of the cations is observed for one of the end members. X-ray absorption spectroscopy, performed at the cobalt and aluminum k-edge, shows that part of the Co2+ cations are oxidized to Co3+, while Al3+ cations have left the LDH's layers, leading to a [Cox2+Co3+] intralayer composition. Interlamellar AlO6 polyhedra are present after repetitive washing and exchange reactions, suggesting strong interactions with the LDH's layers. (C) 2001 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

引用

页码：81 / 92

页数：12

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