Oxygen Diffusion in Y2O3-Containing Tetragonal Zirconia Polycrystals with Different Grain Sizes
Oxygen Diffusion in Y2O3-Containing Tetragonal Zirconia Polycrystals with Different Grain Sizes
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不同粒径含Y2O3四方氧化锆多晶中的氧扩散
DOI：
10.2109/jcersj.99.101
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发表时间：
1991
影响因子：
1.1
通讯作者：
T. Masaki
中科院分区：
文献类型：
--
作者：
Yasuro Ikuma;Y. Tsubaki;T. Masaki
在600 ~ 800℃的温度范围内，用微天平测量了含Y2O3的方形ZrO2多晶（Y-TZP, 2.75mol%Y2O3）中的氧扩散系数。氧同位素（18O）作为示踪剂。不同晶粒尺寸试样的扩散系数相同，说明在Y-TZP中没有沿晶界的快速扩散。氧晶格在Y-TZP中的扩散速度比掺杂14% CeO2的t-ZrO2快。这表明掺杂CeO2的t-ZrO2中大多数铈原子处于4+态，而不是3+态。Y-TZP中的氧晶格扩散系数与ca稳定的立方ZrO2中的氧晶格扩散系数几乎相同，但比掺杂1-2% Y2O3的m-ZrO2中的氧晶格扩散系数高出几个数量级。
The oxygen diffusion coefficient in Y2O3-containing tetragonal ZrO2 polycrystals (Y-TZP, 2.75mol%Y2O3) was determined over the temperature range (600° to 800°C) by monitoring diffusion process with a microbalance. Oxygen isotope (18O) was used as a tracer. The same diffusion coefficient was obtained for specimens with different grain sizes, indicating that there was no fast diffusion along the grain boundaries in Y-TZP. The oxygen lattice diffusion was faster in Y-TZP than t-ZrO2 doped with 14% CeO2. This suggested that most cerium atoms in t-ZrO2 doped with CeO2 were in 4+ rather than 3+. The oxygen lattice diffusion coefficient in Y-TZP was almost the same as that in Ca-stabilized cubic ZrO2, but was several orders of magnitude higher than that in m-ZrO2 doped with 1-2% Y2O3.