Microwave assisted synthesis,sinterability and properties of Ca-Zn co-doped LaCrO3 as interconnect material for IT-SOFCs
来源期刊：Journal of Rare Earths2010年第1期
论文作者：陈永红 卢肖永 丁岩芝 刘杏芹 孟广耀
文章页码：153 - 157
摘 要：The interconnect materials La0.7Ca0.3Cr1-xZnxO3-δ（x=0,0.01,0.03,0.05,0.07） were prepared by a microwave assisted sol-gel auto-ignition process.The crystalline structures of the samples were characterized by X-ray diffraction（XRD） and the lattice parameters were evaluated with Rietveld method.For Ca-Zn co-doped LaCrO3 with x=0.03,the sintering activity was improved,and the relative density came up to 96.5% for the sample sintered at 1300 oC for 10 h.The electrical conductivity of the samples was increased from 21.1 S/cm to the maximum of 70.9 S/cm at 650 oC in air,with the x content increasing from 0.01 to 0.03.However,with x further increasing,the electrical conductivity was decreased.The average thermal expansion coefficient（TEC） of the samples at RT-1000 oC in air was ca.10.0×10-6 K-1.All data indicated that the La0.7Ca0.3Cr1-xZnxO3-δ series ceramics would be potential candidate to be used as an interconnect materials for IT-SOFCs.
陈永红1，卢肖永1，丁岩芝1,2，刘杏芹2，孟广耀2
1. Department of Chemistry,Huainan Normal University2. Department of Materials Science and Engineering,University of Science and Technology of China
摘 要：The interconnect materials La0.7Ca0.3Cr1-xZnxO3-δ（x=0,0.01,0.03,0.05,0.07） were prepared by a microwave assisted sol-gel auto-ignition process.The crystalline structures of the samples were characterized by X-ray diffraction（XRD） and the lattice parameters were evaluated with Rietveld method.For Ca-Zn co-doped LaCrO3 with x=0.03,the sintering activity was improved,and the relative density came up to 96.5% for the sample sintered at 1300 oC for 10 h.The electrical conductivity of the samples was increased from 21.1 S/cm to the maximum of 70.9 S/cm at 650 oC in air,with the x content increasing from 0.01 to 0.03.However,with x further increasing,the electrical conductivity was decreased.The average thermal expansion coefficient（TEC） of the samples at RT-1000 oC in air was ca.10.0×10-6 K-1.All data indicated that the La0.7Ca0.3Cr1-xZnxO3-δ series ceramics would be potential candidate to be used as an interconnect materials for IT-SOFCs.
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