Nonstoichiometry and defect structure of Mn-doped BaTiO3-δ

被引：51

作者：

Lee, DK

Yoo, HI ^{[1
]}

Becker, KD

机构：

[1] Seoul Natl Univ, Sch Mat Sci & Engn, Solid State Ion Res Lab, Seoul 151742, South Korea

[2] Tech Univ Carolo Wilhelmina Braunschweig, Inst Phys & Theoret Chem, Braunschweig, Germany

来源：

SOLID STATE IONICS | 2002年 / 154卷

关键词：

Mn-doped BaTiO3-delta; oxygen nonstoichiometry; coulometric titration; defect structure; valence state of manganese;

D O I：

10.1016/S0167-2738(02)00427-7

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：

Oxygen nonstoichiometry (delta) of 1 m/o Mn-doped polycrystalline BaTiO3-delta has been measured as a function of oxygen partial pressure in the range of 10(-16) less than or equal toP(O2)/atmless than or equal to0.1 at elevated temperatures (900less than or equal toT/degreesCless than or equal to1100) by a solid-state coulometric titration technique. The extent of nonstoichiometry of Mn-doped BaTiO3 is much larger than that of undoped BaTiO3, which is attributed to defect-chemical role of Mn as acceptors. The nonstoichiometry isotherms indicate that Mn-ions change their valence from +4 (or Mn-Ti(X)) to +3 (or Mn-Ti') to +2 (or Mn-Ti'') with decreasing P-O2. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：189 / 193

页数：5

共 16 条

[1] NON-STOICHIOMETRY IN UNDOPED BATIO3 [J].