The transport of oxygen in dense samples of yttria-stabilized zirconia (YSZ), of average grain size d E 50 nm, has been studied by means of 18O/16O exchange annealing and secondary ion mass spectrometry (SIMS). Oxygen diffusion coefficients (D*) and oxygen surface exchange coefficients (k*) were measured for temperatures 673 r T/K r 973 at an oxygen partial pressure of 900 mbar. No evidence is found for fast diffusion along grain boundaries. Rather, the analysis indicates that grain boundaries hinder oxygen transport.
Oxygen diffusion in nanocrystalline yttria-stabilized zirconia: the effect of grain boundaries
ANSELMI TAMBURINI, UMBERTO;
2008-01-01
Abstract
The transport of oxygen in dense samples of yttria-stabilized zirconia (YSZ), of average grain size d E 50 nm, has been studied by means of 18O/16O exchange annealing and secondary ion mass spectrometry (SIMS). Oxygen diffusion coefficients (D*) and oxygen surface exchange coefficients (k*) were measured for temperatures 673 r T/K r 973 at an oxygen partial pressure of 900 mbar. No evidence is found for fast diffusion along grain boundaries. Rather, the analysis indicates that grain boundaries hinder oxygen transport.File in questo prodotto:
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