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Issue 4, 2003
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Metastable forms of the tetragonal phase in compositionally homogeneous, nanocrystalline zirconia–ceria powders synthesised by gel-combustion

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Abstract

The crystal structure of compositionally homogeneous, nanocrystalline ZrO2–10, 30, 50, 70 and 90 mol% CeO2 powders synthesised by a pH-controlled nitrate–glycine gel-combustion process has been studied by X-ray diffraction and Raman spectroscopy. All the powders with a CeO2 content up to 70 mol% exhibited the tetragonal phase (P42/nmc space group), whereas the ZrO2–90 mol% CeO2 solid solution presented the cubic phase (Fm[3 with combining macron]m space group). The axial ratio c/a decreased with increasing CeO2 content and became unity for ZrO2–70 mol% CeO2 powders. By analysing X-ray diffraction data using the Rietveld method, it was found that this material exhibited the t″-form of the tetragonal phase (the oxygen atoms were displaced from their ideal sites of the cubic phase along the c axis). Raman spectroscopy study confirmed the results found by X-ray diffraction. The morphology of the nanopowders was also evaluated.

Graphical abstract: Metastable forms of the tetragonal phase in compositionally homogeneous, nanocrystalline zirconia–ceria powders synthesised by gel-combustion

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Publication details

The article was received on 24 Oct 2002, accepted on 24 Jan 2003 and first published on 18 Feb 2003


Article type: Paper
DOI: 10.1039/B210500B
Citation: J. Mater. Chem., 2003,13, 904-910
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    Metastable forms of the tetragonal phase in compositionally homogeneous, nanocrystalline zirconia–ceria powders synthesised by gel-combustion

    D. G. Lamas, G. E. Lascalea, R. E. Juárez, E. Djurado, L. Pérez and N. E. Walsöe de Reca, J. Mater. Chem., 2003, 13, 904
    DOI: 10.1039/B210500B

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