Crystal structure and local order of nanocrystalline zirconia-based solid solitions

Crystal structure and local order of nanocrystalline zirconia-based solid solitions

Author Fabregas, I. O. Google Scholar
Lamas, D. G. Google Scholar
Acuna, L. M. Google Scholar
Reca, N. E. Walsoee de Google Scholar
Craievich, A. F. Autor UNIFESP Google Scholar
Fantini, M. C. A. Autor UNIFESP Google Scholar
Prado, R. J. Google Scholar
Institution CITEFA CONICET
Universidade Federal de São Paulo (UNIFESP)
Univ Fed Mato Grosso
Abstract Crystal and local structures (long- and short-range order, respectively) of four nanocrystalline zirconia-based solid solutions-ZrO2-6 and 16 mol % CaO and ZrO2-2.8 and 12 mol % Y2O3-synthesized by a pH-controlled nitrate-glycine gel-combustion process were studied. These materials were characterized by synchrotron X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) spectroscopy. Our XRD results indicate that the solid solution with low CaO and Y2O3 contents (6 and 2.8 mol %, respectively) exhibit a tetragonal crystallographic lattice, and those with higher CaO and Y2O3 contents (16 and 12 mol %, respectively) have a cubic lattice. Moreover, our EXAFS study demonstrates that the tetracyonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to variations in the local symmetry of the Zr-O first neighbor coordination sphere. (C) 2008 International Centre for Diffraction Data.
Keywords synchrotron X-ray diffraction
nanocrystalline powders
EXAFS
gel-combustion
zirconia
Language English
Date 2008-06-01
Published in Powder Diffraction. Newtown Sq: J C P D S-int Centre Diffraction Data, v. 23, n. 2, p. S46-S55, 2008.
ISSN 0885-7156 (Sherpa/Romeo, impact factor)
Publisher J C P D S-int Centre Diffraction Data
Extent S46-S55
Origin http://dx.doi.org/10.1154/1.2903503
Access rights Closed access
Type Article
Web of Science ID WOS:000256828200010
URI http://repositorio.unifesp.br/handle/11600/30723

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