“PAS Study on the Defect Structure of Yttria Stabilized Zirconia”

L.C.DAMONTE; TAYLOR, M.A.; DESIMONI J.; J.RUNCO

RADIATION PHYSICS AND CHEMISTRY (OXFORD)

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: The Netherlands; Año: 2007 vol. 76 p. 248 - 251

0969-806X

Powders of stabilized ZrO2–8 mol % Y2O3 (YSZ) have been obtained after 70 h of mechanical milling in zirconia vials. The samples were characterized by X-ray diffraction (XRD). Positron annihilation lifetime (PALS) measurements were performed to investigate the lattice defects originated by the incorporation of yttria and those induced by the mechanical work. The starting powders and the corresponding single crystals were also studied. The XRD results indicate the formation of tetragonal YSZ solid solution. PALS results indicate that positron trapping occurs at different kind of defects such as vacancy-like defects, grain boundary and associated defects.