“Positron characterization of metastable phases in Yttria Stabilized Zirconia”

L. C. DAMONTE; M.C.CARACOCHE; D.LAMAS

Hamilton, Canadá,

Conferencia; XIV International Conference on Positron Annihilation (ICPA14); 2006

Mc.Master University

The thermal evolution of positron annihilation parameters in nanosized 10 mol % Y2O3 doped ZrO2 powders is presented. Three positron lifetimes have been determined up to 900ºC annealing temperature. The two major ones have been interpreted, one as a mean between positron annihilation in the bulk and in vacancy-like open volume defects and the other, as due to annihilation in higher sized volume defects. The intensity ratio between the two defect structures depends on temperature and could be reflecting the thermal t”- to cubic metastable transformation known to occur in the studied system.