Chemical diffusion of (La,Sr)CoO3 and (La,Sr)FeO3期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Chemical diffusion of (La,Sr)CoO3 and (La,Sr)FeO3

Authors:

M Rekas T Bak J Nowotny C C Sorrell Y Zhao K Foger E R Vance

Affiliation:

(1) Centre for Materials Research in Energy Conversion, School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia;(2) Ceramic Fuel Cells Limited, 170 Browns Road, Noble Park, Victoria, 3174, Australia;(3) Materials Division, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, 2234, Australia

Abstract:

The present work reports equilibration kinetics for (La_0.8,Sr_0.2)CoO₃(LSC) and (La_0.72,Sr_0.18)FeO₃(LSF) in the temperature range 876–1114 K using a gravimetric method. Chemical diffusion determined in this way that depends on oxygen partial pressure, can be expressed by the following temperature dependence at low and high O₂), respectively, for LSC:

$D_{chem} = 8.7 \times 10^{ - 3} {\text{exp}}\frac{{{\text{ - }}\left( {58.1 \pm 8.5} \right){\text{kJ/mol}}}}{{RT}}({\text{cm}}^{\text{2}} {\text{s}}^{{\text{ - 1}}} ){\text{ (1)}}$

$D_{chem} = 6.2 \times 10^{ - 3} {\text{exp}}\frac{{{\text{ - }}\left( {75.4 \pm 6.5} \right){\text{kJ/mol}}}}{{RT}}({\text{cm}}^{\text{2}} {\text{s}}^{{\text{ - 1}}} ){\text{ (2)}}$

and for LSF:

$D_{chem} = 3.05 \times 10^{ - 5} {\text{exp}}\frac{{{\text{ - }}\left( {30.3 \pm 2.8} \right){\text{kJ/mol}}}}{{RT}}({\text{cm}}^{\text{2}} {\text{s}}^{{\text{ - 1}}} ){\text{ (3)}}$

$D_{chem} = 6.3 \times 10^{ - 3} {\text{exp}}\frac{{{\text{ - }}\left( {82.7 \pm 10.2} \right){\text{kJ/mol}}}}{{RT}}({\text{cm}}^{\text{2}} {\text{s}}^{{\text{ - 1}}} ){\text{ (4)}}$

Keywords:

本文献已被 SpringerLink 等数据库收录！

设为首页 | 免责声明 | 关于勤云 | 加入收藏