EXAFS study of nanostructured ZrO2-Y2O3 solid solutions

I.O. FÁBREGAS; R.O. FUENTES; D.G.LAMAS; M.E. FERNÁNDEZ DE RAPP; N.E. WALSÖE DE RECA; M.C.A. FANTINI; A.F. CRAIEVICH

2004 Activity Report of the Brazilian Synchrotron Light Laboratory

Laboratorio Nacional de Luz Sincrotron (LNLS)

Año: 2005 p. 496 - 496

1518-0204

In this work, we present an EXAFS study of compositionally homogeneous ZrO2-Y2O3 nanopowders for compositions close to the tetragonal/cubic boundary, (11.0 ± 0.5) mol%Y2O3 (determined in a previous synchrotron XRD study). A t-form powder, with low Y2O3 content, was also analyzed for purpose of comparison. Our results show that the Zr-O bond is sevenfold with two oxygen subshells for both tetragonal and cubic materials. The coordination number and the interatomic distances in the Zr-O shell are almost independent of composition. Differently, a marked change in the Debye-Waller factor of oxygen atoms occurs close to the tetragonal/cubic compositional boundary determined by XRD.