Unmixing of a mixed oxide (A,B)O in an electric field: numerical solution of the time evolution of the unmixing process

被引：8

作者：

Hong, JO

Yoo, HI ^{[1
]}

Teller, O

Martin, M

Mizusaki, J

机构：

[1] Seoul Natl Univ, Sch Mat Sci & Engn, Seoul 151742, South Korea

[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan

[3] Tech Univ Darmstadt, Inst Phys Chem, D-64287 Darmstadt, Germany

来源：

SOLID STATE IONICS | 2001年 / 144卷 / 3-4期

关键词：

unmixing; electric field; oxide solid solution; time evolution;

D O I：

10.1016/S0167-2738(01)00970-5

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 time evolution of the unmixing process in a semiconducting mixed oxide, (A,B)O, under an electric field was calculated by establishing the continuity equations in a phenomenological way and solving them numerically by means of a finite difference method. Temporal variations of composition and defect distribution, and boundary motions were obtained, and therefrom, the distribution of oxygen chemical potential inside the oxide was evaluated. It was found that, sluggish defect relaxation during the unmixing process might induce a gradient of the oxygen chemical potential in addition to the electrotransport-induced composition gradient. General aspects of an electrotransport-induced unmixing process are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：241 / 248

页数：8

共 18 条

[1] CATION DIFFUSION, SEMICONDUCTIVITY AND NONSTOICHIOMETRY IN (CO,NI)O CRYSTALS [J].