Oxygen diffusion in nanocrystalline yttria-stabilized zirconia: the effect of grain boundaries.
The transport of oxygen in dense samples of yttria-stabilized zirconia (YSZ), of average grain size d approximately 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<or=T/K<or=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.
De Souza
Roger A
RA
Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany. desouza@pc.rwth-aachen.de
Pietrowski
Martha J
MJ
Anselmi-Tamburini
Umberto
U
Kim
Sangtae
S
Munir
Zuhair A
ZA
Martin
Manfred
M
D003460:Crystallization; D004058:Diffusion; D013058:Mass Spectrometry; D049329:Nanostructures / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
D015019:Yttrium; D015040:Zirconium; C028541:zirconium oxide; D010100:Oxygen; C091417:yttria