Calcium tracer diffusion in (La,Ca)CrO(3) by SIMS

被引：27

作者：

Horita, T

Ishikawa, M

Yamaji, K

Sakai, N

Yokokawa, H

Dokiya, M

机构：

[1] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan

[2] Yokohama Natl Univ, Hodogaya Ku, Yokohama, Kanagawa 240, Japan

来源：

SOLID STATE IONICS | 1999年 / 124卷 / 3-4期

关键词：

(La; Ca)CrO(3); calcium tracer diffusion; SIMS; SOFC; interconnect materials;

D O I：

10.1016/S0167-2738(99)00150-2

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：

Calcium tracer diffusion coefficients in (La,Ca)CrO(3) were determined by a nitric acid solution application method using (44)Ca(NO(2))(2). The diffusion profiles of (44)Ca in the air-sintered (La,Ca)CrO(3) were measured by secondary ion mass spectrometry (SIMS) with a bombardment of primary O(2)(+) ion. From the SIMS depth concentration profiles of (44)Ca, the diffusion coefficients were determined both for bulk and grain boundary in several annealing conditions. The diffusion coefficients of (44)Ca for bulk were ranged from 10(-16) to 10(-14) cm(2) s(-1) at the temperature ranges from 1173 to 1373 K. The diffusion coefficients of (44)Ca for grain boundary were five to six orders of magnitude larger than those for bulk. The order of the magnitude and the activation energy of (44)Ca bulk diffusion coefficient are similar to those of bulk Ca-Sr interdiffusion. Therefore, a similar diffusion mechanism for bulk can be assumed between the tracer diffusion and the chemical interdiffusion in (La,Ca)CrO(3). The grain boundary diffusion coefficients of (44)Ca showed larger values than those of Ca-Sr interdiffusion. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：301 / 307

页数：7

共 13 条

[1]

Akashi T, 1997, ELEC SOC S, V97, P1263

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