Abstract
Cubic yttria-stabilized zirconias (YSZs) (15 mol% Y2O3) doped with 2 wt% CuO and 0.3 wt% Fe2O3, respectively, have been compared with undoped YSZ. The lattice constants were found to increase in the sequence:aYSZ <aYSZ/Fe <aYSZ/cu. Vickers microhardness of polycrystalline YSZ/Fe exceeds that of polycrystalline YSZ/Cu, whereas the hardness of the single crystalline materials YSZ/Fe and YSZ/Cu are nearly identical and consistently lower than the polycrystalline values. Raman and infrared spectra reveal a breakdown of the selection rules, i.e. these techniques probe the local, non-cubic arrangement of oxygen vacancies. The findings are discussed in terms of a substitutional versus an interstitial-doping model.
Original language | English |
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Journal | Journal of Materials Science |
Volume | 29 |
Issue number | 8 |
Pages (from-to) | 2152-2158 |
ISSN | 0022-2461 |
DOIs | |
Publication status | Published - 1994 |