Quantification of local oxygen defects around Yttrium ions for yttria-doped ceria–zirconia ternary system

Local coordination structure around Yttrium ions in CeO2–Y2O3 binary and [(CeO2)x(ZrO2)1−x]0.8(YO1.5)0.2 (x = 0.0 ~ 1.0) ternary system has been investigated by 89Y MAS-NMR. NMR spectra are found to be consisted of multiple peaks that can be assigned to 6-, 7- and 8-oxygen coordinated Yttrium ions. Compositional dependence of the spectrum was observed and compared with the previous results for ZrO2–Y2O3 binary system. The present investigation suggested the degree of localization of the oxygen vacancy around the cation is in the order of Zr4+ > Y3+ > Ce4+. The degree of the oxygen vacancy preference for each cation was quantitatively determined for CeO2–ZrO2–Y2O3 ternary system the first time.