Diffusional creep of BaCe0.8Y0.2O3-α mixed conductors

被引：27

作者：

Goretta, KC ^{[1
]}

Park, ET ^{[1
]}

Guan, J ^{[1
]}

Balachandran, U ^{[1
]}

Dorris, SE ^{[1
]}

Routbort, JL ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA

来源：

SOLID STATE IONICS | 1998年 / 111卷 / 3-4期

关键词：

creep; cation; diffusion; perovskite; proton conductor;

D O I：

10.1016/S0167-2738(98)00176-3

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：

Compressive creep tests of BaCe0.8Y0.2O3-alpha polycrystals were conducted in Ar to determine deformation rate and calculate the diffusivity of the rate-controlling diffusing species for diffusional creep. At 1200-1450 degrees C, the steady-state strain rate ((epsilon) over dot) could be expressed as (epsilon) over dot = A sigma(1.1+/-0.1) exp[(- 343+/-30 kJ/mole)/RT] where A is a constant, sigma is the steady-state stress, R is the universal gas constant, and T is the absolute temperature. The data and microstructural observations indicated that creep occurred by a grain-boundary-sliding mechanism, which was probably controlled by lattice diffusion of either Ba or Ce. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：295 / 299

页数：5

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