Oxygen ion conduction in 12CaO•7Al2O3: O2- conduction mechanism and possibility of O- fast conduction

被引：55

作者：

Hosono, Hideo ^{[1
,2
,3
]}

Hayashi, Katsuro ^{[2
]}

Kajihara, Koichi ^{[3
,4
]}

Sushko, Peter V. ^{[5
]}

Shluger, Alexander L. ^{[5
]}

机构：

[1] Tokyo Inst Technol, Frontier Res Ctr, Midori Ku, Yokohama, Kanagawa 2268503, Japan

[2] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

[3] Tokyo Inst Technol, Transparent Electroact Mat Project, ERATO SORST, Frontier Res Ctr,Midori Ku, Yokohama, Kanagawa 2268503, Japan

[4] Tokyo Metropolitan Univ, Dept Appl Chem, Grad Sch Urban Environm Sci, Hachioji, Tokyo 1920397, Japan

[5] UCL, Dept Phys & Astron, London Ctr Nanotechnol, Mat Simulat Lab, London WC1E 6BT, England

来源：

SOLID STATE IONICS | 2009年 / 180卷 / 6-8期

关键词：

Oxide ion conduction; Calcium aluminates; Mechanism; Fast oxide ion conduction; OXIDE; DIFFUSION; RADICALS;

D O I：

10.1016/j.ssi.2008.10.015

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：

12CaO center dot 7Al(2)O(3) (C12A7) with a unique nano-porous structure and free O2- ions entrapped in sub-nanometer-sized cages is a fast oxygen-ion-conducting material. These free O2- may be replaced by various oxygen-related species, OH-, O2- and O-, by tuning the atmosphere during the heat treatment. We examined the conduction mechanism for stoichiometric C12A7 (C12A7: O2-). in which O2- ions exist as counter anions in sub-nanometer-sized cages, by Raman measurement of C12A7:O2- annealed in a dry O-18(2) atmosphere. It was revealed that the primary ion conducting species is an O2- ion which diffuses via exchange with O2- in the cage wall. An experimental result on the sample containing O- ions implied that O- is more mobile than O2- in C12A7. Ab initio calculations on the diffusion paths of O2- and O- ions in C112A7 supported the above experimental results. (C) 2008 Elsevier B.V. All rights reserved

引用

页码：550 / 555

页数：6

共 22 条

[1] Thermodynamics and kinetics of hydroxide ion formation in 12CaO•7Al2O3 [J].