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http://dx.doi.org/10.4313/JKEM.2006.19.2.145

Effects of Strontium Gallate Additions on Sintering Behavior and Electrical Conductivity of Ce0.8Gd0.2O2-δ Ceramics  

Park Jin-Hee (부산대학교 재료공학부, 경성대학교 신소재공학과)
Choi Kwang-Hoon (경성대학교 신소재공학과)
Ryu Bong-Ki (부산대학교 재료공학부)
Lee Joo-Sin (경성대학교 신소재공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.19, no.2, 2006 , pp. 145-152 More about this Journal
Abstract
The densification behavior and electrical conductivity of $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics were investigated with the strontium gallate concentration ranging from 0 to $5\;mol\%$. Both the sintered density and grain size were found to increase rapidly up to $0.5\;mol\%$ $Sr_2Ga_2O_5$, and then to decrease with further addition. Dense $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics with $97\%$ of the theoretical density could be obtained for $0.5\;mol\%$ $Sr_2Ga_2O_5$-added specimen sintered at $1250^{\circ}C$ for 5 h, whereas pure $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics needed to be sintered at $1550^{\circ}C$ in order to obtain an equivalent theoretical density, Electrical conductivity was measured as a function of dopant content, over the temperature range of $350\;-\;600^{\circ}C$ in air. Total conductivity of $0.5\;mol\%$ $Sr_2Ga_2O_5$-added specimen showed the maximum conductivity of $2.37{\times}10^{-2}{{\Omega}-1}{\cdot}cm^{-1}$ at $500^{\circ}C$, The addition of strontium gallate was found to promote the sintering properties and electrical conductivities of $Gd_2O_3$-doped $CeO_2$.
Keywords
Gadolinia-doped ceria; Strontium gallate; Sintering; Electrical conductivity;
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