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

研究成果: Article

12 引用 (Scopus)

抜粋

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.

元の言語English
ページ(範囲)576-579
ページ数4
ジャーナルSolid State Ionics
192
発行部数1
DOI
出版物ステータスPublished - 2011 6 16

ASJC Scopus subject areas

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

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  • これを引用

    Ando, M., Oikawa, I., Noda, Y., Ohki, S., Tansho, M., Shimizu, T., Kiyono, H., & 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