Densification below 1000C and grain growth behaviors of yttria doped ceria ceramics
Starting with nanopowders synthesized via carbonate coprecipitation, fully dense Ce1-xYxO2-δ(x=0.025-0.35) ceramics have been fabricated via pressureless sintering at a temperature as low as 950℃ Y3+-doping retards both densification and grain growth, but its effect tends to saturate at ～10 at.%. Sintering atmosphere was found in this work greatly affecting the grain growth during sintering, and a more oxidative one favors finer grain sizes. Grain growth of the yttrium-doped CeO2 ceramics obeys the parabolic law (normal growth) in the investigated temperature range 950-1400℃, and its activation energy increases from 115.3 kJ/mol at 2.5 at.% of Y3+to 293.2 kJ/mol at 35 at.% of Y3+.
Yttrium-doped CeO2 Sintering Grain growth kinetics Sintering atmosphere
Ji-Guang Li Yarong Wang Takayasu Ikegami Takamasa Ishigaki
Nano Ceramics Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-004 Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technolo
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
951-954
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）