Microstructure and electrical properties of Mn1+xCO2-xO4(0≤x≤1.5) spinels synthesized using EDTA-gel processes

被引：55
作者：
Brylewski, T. [1 ]
Kucza, W. [1 ]
Adamczyk, A. [1 ]
Kruk, A. [1 ]
Stygar, M. [1 ]
Bobruk, M. [1 ]
Dabrowa, J. [1 ]
机构：
[1] AGH Univ Sci & Technol, Fac Mat Sci & Ceram, PL-30059 Krakow, Poland
来源：
CERAMICS INTERNATIONAL | 2014年 / 40卷 / 09期
关键词：
Electrical conductivity; Spinels; Solid Oxide Fuel Cell (SOFC); Metallic interconnects; Cobalt manganese ceramics; FERRITIC STAINLESS-STEELS; SOFC INTERCONNECT; PROTECTION LAYERS; METALLIC INTERCONNECTS; CATION DISTRIBUTION; RESISTANT ALLOYS; MANGANESE OXIDE; OXIDATION; CONDUCTIVITY; TEMPERATURE;
D O I：
10.1016/j.ceramint.2014.05.106
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Cobalt manganese spinels have recently been studied as potential candidates for protective-conducting coatings on ferritic stainless steel interconnects for Intermediate-Temperature Solid Oxide Fuel Cells (IT-SOFCs) applications. Mn1+xCo2-xO4 (x=0, 0.25, 0.5, 0.75, 1.0 and 1.5) spinels were synthesized using EDTA-gel processes to optimize the performance of high-quality spinel protective-conducting films developed on steel interconnects. The structure, morphology and the electrical conductivity of the obtained bulk samples were investigated using XRD, SEM and EIS, respectively. The obtained MnCo2O4 and Mn-1.25Co1.75O4 oxides were cubic spinels over the whole temperature range (373 <= T <= 1073K). The other samples exhibited both tetragonal and cubic structures with higher cubic phase content at increasing temperatures. The prepared Mn1+xCo2-xO4 (0 <= x <= 0.5) spinels exhibited desirable electrical conductivity; the highest conductivity at 1073 K was found for MnCo2O4(132.2 S cm(-1)), whereas the lowest one (1.9 S cm(-1)) for Mn2.5Co0.5O4. Tetragonal cubic phase transition depended on spinel composition, and its influence on the electrical properties of the spinel solid solutions was studied over a wide temperature range. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
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页码：13873 / 13882
页数：10
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