Low temperature sintering characteristics and properties of SOFC ceramic interconnect material La0.7Ca0.3Cr0.97O3

Songlin Wang; Xingqin Liu; Guangyao Meng

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Low temperature sintering characteristics and properties of SOFC ceramic interconnect material La0.7Ca0.3Cr0.97O3

Songlin Wang #,Xingqin Liu *,Guangyao Meng

Department of Materials Science and Engineering, University of Science and Technology of China (USTC)

*Correspondence author

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Funding: 国家自然科学基金,国家自然科学基金,教育部博士点基金（No.50572099,50730002,20060358034）

Opened online:29 December 2007

Accepted by: none

Citation: Songlin Wang,Xingqin Liu,Guangyao Meng.Low temperature sintering characteristics and properties of SOFC ceramic interconnect material La0.7Ca0.3Cr0.97O3[OL]. [29 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17576

Relatively low temperature (1150-1300 ℃) sintering characteristics and electric conductivities of La0.7Ca0.3Cr0.97O3 with a slight Cr deficiency of 0.03，prepared by an auto-ignition process, have been discussed. The material could reach 94.3 % relative density at 1200 °C for 5 h in air, which is about 200 ℃ lower than that of with no Cr deficiency. XRD results indicated that pure perovskite phase was formed after sintered at the temperature range of 1150-1300℃. The sample sintered at 1250 °C had the maximum conductivity of 62.0 Scm-1 at 850 °C in air, which is about 2.6 times as high as that of La0.7Ca0.3CrO3 with no Cr deficiency. In pure H2, it got the maximum electrical conductivity of 3.3 Scm-1 at 850 °C as sintered at 1200 °C. The TEC of the material was about 11.4 × 10-6 K-1, which is very compatible to that of other common used SOFC components. Therefore, it is a simple and cost-effective interconnect material for SOFCs.

Keywords:Lanthanum chromite; Cr deficiency; Auto-ignition process; Interconnect; SOFC

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