Densification below 1000 degrees C and grain growth behaviors of yttria doped ceria ceramics

作者：Li Ji Guang^*; Wang Yarong; Ikegami Takayasu; Ishigaki Takamasa

来源：Solid State Ionics, 2008, 179(21-26): 951-954.

DOI：10.1016/j.ssi.2008.01.053

• yttrium-doped CeO(2)
• sintering
• grain growth kinetics
• sintering atmosphere

Starting with nanopowders synthesized via carbonate coprecipitation, fully dense Ce(1-x)Y (x)O(2-delta) (x=0.025-0.35) ceramics have been fabricated via pressureless sintering at a temperature as low as 950 degrees C. Y(3+)-doping retards both densification and grain growth, but its effect tends to saturate at similar to 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 CeO(2) ceramics obeys the parabolic law (normal growth) in the investigated temperature range 950-1400 degrees C, and its activation energy increases from 115.3 kJ/mol at 2.5 at.% of Y(3+) to 293.2 kJ/mol at 35 at.% of Y(3+).

• 出版日期2008-9-15