INVESTIGADORES
FABREGAS Ismael Oscar
artículos
Título:
High-temperature XPD study of the tetragonal-cubic phase transition in nanocrystalline, compositionally homogeneous ZrO2-CeO2 solid solutions
Autor/es:
L.M. ACUÑA; R.O. FUENTES; D.G. LAMAS; I.O. FÁBREGAS; M.G. ZIMICZ; M.E. FERNÁNDEZ DE RAPP; N.E. WALSÖE DE RECA; A.F. CRAIEVICH
Revista:
POWDER DIFFRACTION
Editorial:
JCPDS-International Centre for Diffraction Data
Referencias:
Lugar: Newtown Square; Año: 2008 vol. 23 p. 70 - 74
ISSN:
0885-7156
Resumen:
Crystal structure of compositionally homogeneous, nanocrystalline ZrO2-CeO2 solutions was investigated by X-ray powder diffraction as a function of temperature for compositions between 50 and 65 mol % CeO2. ZrO2-50 and 60 mol % CeO2 solid solutions, which exhibit the t´-form of the tetragonal phase at room temperature, transform into the cubic phase in two steps: t´-to-t´´ followed by t´´-to-cubic. But the ZrO2-65 mol % CeO2, which exhibits the t´´-form, transforms directly to the cubic phase. The results suggest that t´-to-t´´ transition is of first order, but t´´-to-cubic seems to be of second order.
