Effect of stability and diffusivity of extra-framework oxygen species on the formation of oxygen radicals in 12CaO•7Al2O3

被引：37

作者：

Hayashi, K

Ueda, N

Hirano, M

Hosono, H

机构：

[1] Tokyo Inst Technol, Frontier Collaborat Res Ctr, Yokohama, Kanagawa 2130012, Japan

[2] Japan Sci & Technol Agcy, Transparent Electroact Mat Project, Kawasaki, Kanagawa 2130012, Japan

[3] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

来源：

SOLID STATE IONICS | 2004年 / 173卷 / 1-4期

关键词：

cage; active oxygen; superoxide ion; oxygen anion radical; C12A7;

D O I：

10.1016/j.ssi.2004.07.057

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The thermodynamics and kinetics of oxygen radical formation process in a nanoporous crystal. 12CaO . 7Al(2)O(3), were examined by isothermal annealing experiments in dry atmospheres. It is clarified that the formation of oxygen radicals. O-2(-) and O-, in the crystal occurs in the following three steps; outward diffusion of extra-framework oxide ions, its oxidation by absorbed oxygen molecules to form O- and O-2(-) at the surface, and subsequent inward diffusion of the oxygen radicals. The instability of the extra-framework oxide ions is essentially the driving force for the process. Further, the analyses allow to predict the total oxygen radical content for a given annealing condition (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：89 / 94

页数：6

共 19 条

[1]

BARTL H, 1970, NEUES JB MINERALOGIE, V1970

[2] CHARACTERIZATION AND REACTIVITY OF MOLECULAR-OXYGEN SPECIES ON OXIDE SURFACES [J].