Abstract
Local coordination structure around Yttrium ions in CeO 2–Y 2O 3 binary and [(CeO 2) x (ZrO 2) 1− x ] 0.8(YO 1.5) 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 ZrO 2–Y 2O 3 binary system. The present investigation suggested the degree of localization of the oxygen vacancy around the cation is in the order of Zr 4+ > Y 3+ > Ce 4+. The degree of the oxygen vacancy preference for each cation was quantitatively determined for CeO 2–ZrO 2–Y 2O 3 ternary system the first time.
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