Preparation and characterization of ceria co-doped with Ca and Mg

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• 作者：Om Parkash ; ^{oprakash.cer@itbhu.ac.in} ; Namrata Singh ; Nitish Kumar Singh ; Devendra Kumar
• 关键词：Ceria ; Impedance spectroscopy ; Ionic conductivity ; Solid oxide fuel cells
• 刊名：Solid State Ionics
• 出版年：2012
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：29 March, 2012
• 卷：212
• 期：Complete
• 页码：100-105
• 文件大小：1359 K

摘要

The aim of the present investigation was to study the effect of doping of magnesium and calcium on the ionic conductivity of CeO₂ in the system Ce_{1 鈭?#xA0;x}Ca_{x 鈭?#xA0;y}Mg_yO_{2 鈭?#xA0;x} (x = 0.150) for its use as a solid electrolyte in the intermediate temperature solid oxide fuel cells (IT SOFC).Attempts have been made to synthesize a few compositions in this system with x = 0.150 and y = 0.000, 0.050, 0.060, 0.065 and 0.070. The precursor materials have been synthesized by auto-combustion method. Solid solution forms in compositions with y 鈮?#xA0;0.060. Microstructures of thermally etched samples have been studied by scanning electron microscopy (SEM). In order to evaluate the total electrical conductivity, 蟽_t, use is made of complex plane impedance analysis. Impedance measurements were made in the frequency range 1 Hz-1 MHz and temperature range 250-500 掳C. It is found that co-doped samples show higher conductivity than undoped and singly doped samples.