Structure of nanocrystalline zirvonia and yttria

R. Nitsche; M. Winterer; H. Hahn

doi:10.1016/0965-9773(95)00149-2

Structure of nanocrystalline zirvonia and yttria

R. Nitsche
, M. Winterer
, H. Hahn

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

Abstract

A combination of spectroscopic and imaging methods was chosen to investigate extended (XRD, TEM) and local (EXAFS, HR-TEM) structure of nanosized ZrO₂ and Y₂0₃. Phase content of the powders was determined by Rietveld analysis. We investigated phase stability of metastable polynorphs 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-Zr0₂ (80 nm) the EXAFS oscillation is nearly identical to the monoclinic coarse grained powder. High-Resolution-TEM micrographs slow crystalline grains with grain sizes between 5 and 30 nm. Image contrast simulations of n-Zr0₂ powder micrographs indicate at least for some particles a shell like structure with different phases.

Original language	English (US)
Pages (from-to)	679-682
Number of pages	4
Journal	Nanostructured Materials
Volume	6
Issue number	5-8
DOIs	https://doi.org/10.1016/0965-9773(95)00149-2
State	Published - 1995
Externally published	Yes

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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title = "Structure of nanocrystalline zirvonia and yttria",

abstract = "A combination of spectroscopic and imaging methods was chosen to investigate extended (XRD, TEM) and local (EXAFS, HR-TEM) structure of nanosized ZrO2 and Y203. Phase content of the powders was determined by Rietveld analysis. We investigated phase stability of metastable polynorphs 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-Zr02 (80 nm) the EXAFS oscillation is nearly identical to the monoclinic coarse grained powder. High-Resolution-TEM micrographs slow crystalline grains with grain sizes between 5 and 30 nm. Image contrast simulations of n-Zr02 powder micrographs indicate at least for some particles a shell like structure with different phases.",

author = "R. Nitsche and M. Winterer and H. Hahn",

year = "1995",

doi = "10.1016/0965-9773(95)00149-2",

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pages = "679--682",

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T1 - Structure of nanocrystalline zirvonia and yttria

AU - Nitsche, R.

AU - Winterer, M.

AU - Hahn, H.

PY - 1995

Y1 - 1995

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AB - A combination of spectroscopic and imaging methods was chosen to investigate extended (XRD, TEM) and local (EXAFS, HR-TEM) structure of nanosized ZrO2 and Y203. Phase content of the powders was determined by Rietveld analysis. We investigated phase stability of metastable polynorphs 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-Zr02 (80 nm) the EXAFS oscillation is nearly identical to the monoclinic coarse grained powder. High-Resolution-TEM micrographs slow crystalline grains with grain sizes between 5 and 30 nm. Image contrast simulations of n-Zr02 powder micrographs indicate at least for some particles a shell like structure with different phases.

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DO - 10.1016/0965-9773(95)00149-2

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EP - 682

JO - Nanostructured Materials

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IS - 5-8

ER -

Structure of nanocrystalline zirvonia and yttria

Abstract

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