Characterization of A-site excessive perovskite La0.7-xSmx+0.02Ca0.3CrO3-δ
来源期刊：Journal of Rare Earths2009年第2期
论文作者：邓飞军 周晓亮 马建军 姜彩荣 孟广耀 刘杏芹
文章页码：227 - 230
摘 要：La0.7-xSmx+0.02Ca0.3CrO3-δ （0≤x≤0.4） powders with A-site excessive perovskite structure were synthesized by auto-ignition process and characterized. X-ray diffraction （XRD） patterns of samples after sintering at 1400 °C for 4 h were indexed as tetragonal structure. The relative densities were all above 96% although decreased slightly with the increasing content of samarium, indicating that the excessive A-site element was helpful to enhance their sinterability. Conductivities of the specimens in air increased with increasing content of samarium. The conductivity of La0.6Sm0.12Ca0.3CrO3-δ was 33.6 S/cm in air at 700 °C which was about 1.7 times as high as that of La0.7Ca0.3CrO3-δ （20.1 S/cm）. Average thermal expansion coefficients （TECS） of the specimens increased from 11.06×10-6 to 12.72×10-6 K-1 when x in- creased from 0 to 0.4, and they were close to that of Y doped ZrO2 （YSZ）. La0.7-xSmx+0.02Ca0.3CrO3-δ （0.1≤x≤0.3） were good choices for intermediate temperature solid oxide fuel cells （IT-SOFCs） interconnect materials.
邓飞军，周晓亮，马建军，姜彩荣，孟广耀，刘杏芹
摘 要：La0.7-xSmx+0.02Ca0.3CrO3-δ （0≤x≤0.4） powders with A-site excessive perovskite structure were synthesized by auto-ignition process and characterized. X-ray diffraction （XRD） patterns of samples after sintering at 1400 °C for 4 h were indexed as tetragonal structure. The relative densities were all above 96% although decreased slightly with the increasing content of samarium, indicating that the excessive A-site element was helpful to enhance their sinterability. Conductivities of the specimens in air increased with increasing content of samarium. The conductivity of La0.6Sm0.12Ca0.3CrO3-δ was 33.6 S/cm in air at 700 °C which was about 1.7 times as high as that of La0.7Ca0.3CrO3-δ （20.1 S/cm）. Average thermal expansion coefficients （TECS） of the specimens increased from 11.06×10-6 to 12.72×10-6 K-1 when x in- creased from 0 to 0.4, and they were close to that of Y doped ZrO2 （YSZ）. La0.7-xSmx+0.02Ca0.3CrO3-δ （0.1≤x≤0.3） were good choices for intermediate temperature solid oxide fuel cells （IT-SOFCs） interconnect materials.
关键词：
