title: Oxygen diffusion in nanocrystalline yttria-stabilized zirconia: the effect of grain boundaries.
abstract: 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.
authors.affiliation: Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany. desouza@pc.rwth-aachen.de
authors.forename: Roger A
authors.initials: RA
authors.lastname: De Souza
authors.forename: Martha J
authors.initials: MJ
authors.lastname: Pietrowski
authors.forename: Umberto
authors.initials: U
authors.lastname: Anselmi-Tamburini
authors.forename: Sangtae
authors.initials: S
authors.lastname: Kim
authors.forename: Zuhair A
authors.initials: ZA
authors.lastname: Munir
authors.forename: Manfred
authors.initials: M
authors.lastname: Martin
mesh_terms: D003460:Crystallization; D004058:Diffusion; D013058:Mass Spectrometry; D049329:Nanostructures / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D015019:Yttrium; D015040:Zirconium; C028541:zirconium oxide; D010100:Oxygen; C091417:yttria