High field O-17 NMR study of defects in doped zirconia and ceria

Mariko Ando, Itaru Oikawa, Yasuto Noda, Shinobu Ohki, Masataka Tansho, Tadashi Shimizu, Hajime Kiyono, Hideki Maekawa

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11 Citations (Scopus)

Abstract

The local coordination structure around oxygen ions in CeO 2-Y2O3 (YDC) and Y2O 3-ZrO2 (YSZ) binary has been investigated by solid-state O-17 magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy at high magnetic field of 21.8 T. Compositional dependence of the spectrum was observed and compared with the previous Y-89 MAS NMR results. The O-17 MAS NMR spectra of YSZ showed a line shape with overlapped peaks which did not allow straightforward peak separation. On the other hand, O-17 MAS NMR of YDC showed clearly resolved peaks depending on the local coordination environments of oxygen sites. By the peak separation, the relative amount of oxygen tetrahedra with different numbers of cations, OT(4Ce), OT(3Ce + 1Y) and OT(2Ce + 2Y) can be determined. OT(4Ce) was dominant compared to OT(3Ce + 1Y) and OT(2Ce + 2Y) at Y contents below 25%. The distribution of oxygen species deviated from a value expected from a random distribution. Therefore, the thermodynamic stability of oxygen species was considered, assuming an equilibrium constant between O T(4Ce), OT(3Ce + 1Y) and OT(2Ce + 2Y). A preferential decrease of OT(3Ce + 1Y) species was found to reproduce the experimental values. The degree of the oxygen sites preference on composition was quantitatively determined for YDC for the first time.

Original languageEnglish
Pages (from-to)576-579
Number of pages4
JournalSolid State Ionics
Volume192
Issue number1
DOIs
Publication statusPublished - 2011 Jun 16
Externally publishedYes

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Keywords

  • Ceria
  • Local structure
  • O-17 NMR
  • Oxygen defect
  • Yttria
  • Zirconia

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Chemistry(all)

Cite this

Ando, M., Oikawa, I., Noda, Y., Ohki, S., Tansho, M., Shimizu, T., ... Maekawa, H. (2011). High field O-17 NMR study of defects in doped zirconia and ceria. Solid State Ionics, 192(1), 576-579. https://doi.org/10.1016/j.ssi.2010.04.024