Structure of nanocrystalline zirconia and yttria

被引：48

作者：

Nitsche, R

Winterer, M

Hahn, H

机构：

[1] Department of Materials Science Technical University Darmstadt

来源：

NANOSTRUCTURED MATERIALS | 1995年 / 6卷 / 5-8期

关键词：

Nanostructured materials;

D O I：

10.1016/0965-9773(95)00149-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A combination of spectroscopic and imaging methods was chosen to investigate extended (XRD, TEM) and local (EXAFS, HR-TEM) structure of nanosized ZrO2 and Y2O3. Phase content of the powders was determined by Rietveld analysis. We investigated phase stability of metastable polymorphs in n-oxides by in-situ high temperature and high pressure XRD. EXAFS oscillations in nano oxide powders (5 to 30 nm) are distinctly weaker compared to coarse grained samples. In a compacted and sintered sample of n-ZrO2 (80 nm) the EXAFS oscillation is nearly identical to the monoclinic coarse grained powder. High-Resolution-TEM micrographs show crystalline grains with grain sizes between 5 and 30 nm. Image contrast simulations of n-ZrO2 powder micrographs indicate at least for some particles a shell like structure with different phases.

引用

页码：679 / 682

页数：4

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