INVESTIGADORES
FABREGAS Ismael Oscar
artículos
Título:
Local structure of the metal-oxygen bond in compositionally homogeneous, nanocrystalline ZrO2-CeO2 solid solutions synthesized by a gel-combustion process
Autor/es:
I.O. FÁBREGAS; D.G. LAMAS; R.O. FUENTES; M.E.FERNÁNDEZ DE RAPP; G.E. LASCALEA; J.R. CASANOVA; N.E. WALSÖE DE RECA; A.F. CRAIEVICH; M.A.C. FANTINI
Revista:
JOURNAL OF PHYSICS CONDENSED MATTER
Editorial:
Institute of Physics Publishing
Referencias:
Año: 2006 p. 7863 - 7881
ISSN:
0953-8984
Resumen:
Compositionally homogeneous ZrO2-CeO2 nanopowders have been characterized by Raman and extended X-ray absorption fine structure (EXAFS) spectroscopies. These techniques revealed a tetragonal-to-cubic phase transition as a function of CeO2 content, as observed in a previous synchrotron X-ray diffraction study. The tetragonal-cubic phase boundary was found to be at (85±5) mol% CeO2. EXAFS study demonstrated that this transition is related to a tetragonal-to-cubic symmetry change of the Zr-O first neighbor coordination sphere, while the Ce-O coordination sphere preserves its cubic symmetry over the whole composition range.
