Electrical conductivity of Cr2O3 doped with TiO2

被引：78

作者：

Holt, A ^{[1
]}

Kofstad, P ^{[1
]}

机构：

[1] Univ Oslo, Ctr Mat Sci, N-0371 Oslo, Norway

来源：

SOLID STATE IONICS | 1999年 / 117卷 / 1-2期

关键词：

Ti-dopant; p-conductor; electrical conductivity;

D O I：

10.1016/S0167-2738(98)00244-6

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 electrical conductivity of Cr2O3 doped with TiO2 has been studied by the four point technique as a function of the oxygen activity (O-2 + Ar, CO + CO2 and H-2 + H2O) at 1000 degrees C and hydrogen activity (H-2 + H2O) at temperatures from 400 to 1000 degrees C, Ti-doped chromia is an n-conductor at reduced oxygen activities (ambient H-2 + H2O and CO + CO2 gas mixtures) and a p-conductor at near atmospheric oxygen activities. It is concluded that the Ti-dopant is compensated by the formation of chromium vacancies at near-atmospheric oxygen activities and by electrons at highly reduced oxygen activities (near the Cr/Cr2O3 boundary). Chromia dissolves hydrogen as protons in ambient H-2 + H2O gas mixtures at reduced temperatures (<1000-800 degrees C), but the solubility of hydrogen is decreased by the presence of higher-valent Ti-dopant. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：21 / 25

页数：5

共 4 条

[1] THE ABSOLUTE SCALE OF THERMOELECTRIC POWER AT HIGH TEMPERATURE [J].