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J. Korean Ceram. Soc. > Volume 34(12); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(12): 1221.
첨가제와 소결분위기가 $SnO_2$ 요업체의 치밀화에 미치는 영향
정재일, 김봉철, 장세홍1, 김정주
경북대학교 무기재료공학과
Effects of Sintering Atmosphere and Dopant Addition on the Densifcation of $SnO_2$ Ceramics
The effects of sintering atmosphere and dopant addition on the behavior of densification and grain growth of SnO2 ceramics were investigated with consideration of defect chemistry. CoO and Nb2O5 were chosen as dopants, and oxygen and nitrogen were used for controlling of sintering atmospheres. With the decrease of oxygen partial pressure, densification was depressed due to evaporation of SnO2 ceramics. In the case of SnO2 sintering, the addition of CoO, which produced oxygen vacancy in SnO2 ceramics, led to acceleration of densification and grain growth. On the contrary, when Nb2O5 as a dopant producing Sn vacancy was added to SnO2 ceramics, densification and grain growth were simultaneously retarded. As results, it was conformed that diffusion of oxygen ions was rate determinant in densification and grain growth of SnO2 ceramics.
Key words: $SnO_2$, CoO, $Nb_2O_5$, Densification, Grain Growth, Sintering Atmosphere, Dopant addition
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