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稳定化氧化锆的晶界导电模型

郭 新

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稳定化氧化锆的晶界导电模型

郭 新

A GRAIN-BOUNDARY CONDUCTION MODEL FOR STABILIZED-ZIRCONIA

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  • 晶界空间电荷层在高纯的稳定化ZrO2的晶界电阻中起着重要作用,以此为基础,提出了一个稳定化ZrO2的晶界导电模型,根据这个模型分析了Ca,Y和Al的晶界偏聚对稳定化ZrO2的晶界导电性的影响,并同时分析了被广泛应用的以Bauerle等效电路为基础的晶界电阻测量方法的局限性,以及一些晶界性能表征参量的物理意义及欠妥之处.
    In stabilized-ZrO2 with high-purity, the space-charge contribution plays a dominating role in the grain-boundary resistance. A grain-boundary conduction model is proposed on the basis of this concept, and the effect of the segregations of calcium, yttrium and aluminium on the space-charge conduction is discussed, the segregations are all found to decrease the space-charge conduction, thus increase the grain-boundary resistance. Some formerly-established concepts are evaluated via the model, the limitation of the complex impedance approach based on the Bauerle′s equivalent circuit is pointed out, and the defect of the concept of the resistance per unit interface area of the grain boundaries is also discussed.
    • 基金项目: 国家自然科学基金(批准号:59602012)和湖北省自然科学基金(批准号:96J024)资助的课题.
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  • 文章访问数:  6251
  • PDF下载量:  708
  • 被引次数: 0
出版历程
  • 收稿日期:  1997-12-01
  • 刊出日期:  1998-04-05

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