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J. Korean Ceram. Soc. > Volume 32(3); 1995 > Article
Journal of the Korean Ceramic Society 1995;32(3): 359.
$Bi_2O_3-CaO$계에서의 미세구조가 이온 전도도에 미치는 영향
홍익대학교 무기재료공학과
The Effect of Microstructure on the Ionic Conductivity in the $Bi_2O_3-CaO$ System
The grain boundary effect on the ionic conductivity was investigated using a.c. admittance analysis in (Bi2O3)0.715(CaO)0.285 oxygen-ion conducting solid electrolyte. As a separated arc representing grain boundary polarization was not observed in the admittance plane, bulk conductivity was measrued for samples with various grain sizes in the temperature range from 48$0^{circ}C$ to 72$0^{circ}C$ and the conductivity distribution between grain interior and grain boundary was determined by the reported analytical methods. In the above temperature range, grain boundary worked as a high conductive path instead of blocking layer and ionic conduction through grain boundary was significant. The activation energy for conduction through grain and grain boundary was 78 and 106 kJ/mol, respectively.
Key words: Oxygen ion conductor, Activation energy grain boundary effect, a.c. admittance analysis temperature comparison method
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