Grain boundary mobility in Y2O3: Defect mechanism and dopant effects
Grain boundary mobility in Y2O3: Defect mechanism and dopant effects
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DOI：
10.1111/j.1151-2916.1996.tb07998.x
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发表时间：
1996-07-01
影响因子：
3.9
通讯作者：
Chen, IW
中科院分区：
文献类型：
--
作者：
Chen, PL;Chen, IW
在1500 ℃至1650 ℃温度范围内研究了Mg ~（2+）、Sr ~（2+）、Sc ~（3+）、Yb ~（3+）、Gd ~（3+）、La ~（3+）、Ti ~（4+）、Zr ~（4+）、Ce ~（4+）和Nb ~（5+）等掺杂剂对致密Y ~（2+）O ~（3+）晶界迁移率的影响。在0.31 μ m至12.5 μ m的晶粒尺寸范围内，结合大气效应，结果表明，间隙输运是Y_2O_3中扩散过程的限速步骤，CeO_2中也是如此。溶质拖曳效应不能确定，但尺寸过小的掺杂剂的反常效应（Ti和Nb）对扩散增强的影响，先前在CeO 2中报道的，再次得到证实。还观察到异价掺杂剂和氧缺陷之间非常大的结合能的指示。总体而言，最有效的晶粒生长抑制剂是Zr 4+，而最有效的晶粒生长促进剂是Sr 2+，两者的浓度均为1.0%。
The effects of the dopants, Mg2+, Sr2+, Sc3+, Yb3+, Gd3+, La3+, Ti4+, Zr4+, Ce4+, and Nb5+, On the grain boundary mobility of dense Y2O3 have been investigated from 1500 degrees to 1650 degrees C, Parabolic grain growth has been observed in all cases over a grain size from 0.31 to 12.5 mu m, Together with atmospheric effects, the results suggest that interstitial transport is the rate-limiting step for diffusive processes in Y2O3, which is also the case in CeO2, The effect of solute drag cannot be ascertained but the anomalous effect of undersized dopants (Ti and Nb) on diffusion enhancement, previously reported in CeO2, is again confirmed, Indications of very large binding energies between aliovalent dopants and oxygen defects are also observed, Overall, the most effective grain growth inhibitor is Zr4+, while the most potent grain growth promoter is Sr2+, both at 1.0% concentration.