Measurement of Defect-Mediated Oxygen Self-Diffusion in Metal Oxides

Measurement of Defect-Mediated Oxygen Self-Diffusion in Metal Oxides
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金属氧化物中缺陷介导的氧自扩散的测量

DOI:
10.1149/2.011202jss
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发表时间:
2012
影响因子:
2.2
通讯作者:
E. Seebauer
E. Seebauer
中科院分区:
材料科学4区
文献类型:
--
作者:
Prashun Gorai;A. Hollister;E. Seebauer

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在某些金属氧化物中,本征缺陷的固态扩散通过与晶格原子周期性交换的高度移动的中间物质发生。建立了一个数学模型,用于在短时间内从介观气固扩散测量中确定关键的扩散参数。该模型提供了一个简单的分析手段,利用标准的同位素气-固交换实验,以获得连接到表面的缺陷形成的扩散长度和净速率的参数。应用该方法的实验数据的氧自扩散在二氧化钛表明,在气-固交换发生通过一个特别干净的表面的条件下,快速移动的物种介导的氧自扩散。
Solid-state diffusion of native defects in some metal oxides takes place via highly mobile intermediate species that periodically exchange with lattice atoms. A mathematical model has been formulated to determine the key diffusion parameters from mesoscopic gas-solid diffusion measurements in the short-time limit. The model provides a straightforward analytical means to utilize standard isotope gas-solid exchange experiments to obtain parameters connected to diffusion length and net rate of defect formation at the surface. Application of the method to experimental data for oxygen self-diffusion in titanium dioxide suggests that under conditions where gas-solid exchange takes place through an especially clean surface, a fast-moving species mediates oxygen self-diffusion.
DOI: 10.1103/physrevb.73.115207
发表时间: 2006-03-01
期刊: PHYSICAL REVIEW B
影响因子: 3.7
作者:
Erhart, P;Albe, K
通讯作者: Albe, K