Electrical Properties of Ca-Doped BiFeO3 Ceramics: From p-Type Semiconduction to Oxide-Ion Conduction

被引：175

作者：

Maso, Nahum ^{[1
]}

West, Anthony R. ^{[1
]}

机构：

[1] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England

来源：

CHEMISTRY OF MATERIALS | 2012年 / 24卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

Ca-doped BiFeO3; mixed oxide ion/electron conduction;

D O I：

10.1021/cm300683e

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 conductivity of Ca-doped BiFeO3 ceramics varies by many orders of magnitude, depending on the oxygen partial pressure during processing. Bi1-xCaxFeO3-(x/2)+delta ceramics are mixed oxide ion/electron conductors at 800 degrees C, but the electron conduction can be suppressed; when sintered and cooled in N-2 from 800 degrees C, they are oxide ion conductors with activation energy similar to 0.82-1.04 eV and conductivity similar to 1 X 10(-5) S cm(-1) at 300 degrees C, comparable to that of 8 mol % yttria-stabilized zirconia. When heated in O-2 at 125 bar, however, they are mainly p-type semiconductors with conductivity similar to 1 X 10(-3)-4 X 10(-5) S cm(-1) at room temperature and activation energy similar to 0.27-0.40 eV. The oxygen stoichiometry varies over the range 0 < delta < similar to 0.016, depending on processing conditions. The semiconductivity is attributed to mixed valence Fe with < similar to 3.2% Fe4+.

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页码：2127 / 2132

页数：6

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