Oxygen-17NMR study of defects in LnO1.5-CeO2 (Ln = La and Nd)

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

Research output: Contribution to journalArticle

Abstract

The local structure around the oxide ions in LnO1.5-CeO 2 (Ln = La, Nd) was studied by using 17ONMR spectroscopy. Each spectrum of LnO1.5-CeO2 showed a broad peak due to a distribution of oxygen tetrahedra. From the peak separation, the relative numbers of oxygen tetrahedra, O[Ce]4, O[Ce]3[Ln], and O[Ce]2[Ln]2, were determined quantitatively. In the La2O3CeO2 system, the amounts of O[Ce] 4, O[Ce]3[Ln], and O[Ce]2[Ln]2 deviated from the calculated value for over 20 mol% La-doped ceria (LDC). The distribution of oxygen tetrahedra for LaO1.5CeO2 differed from those in LnO 1.5CeO2 (Ln = Nd, Y). These results suggest that the stability of the oxygen tetrahedra changes with the size of the doped ions.

Original languageEnglish
Pages (from-to)57-59
Number of pages3
JournalChemistry Letters
Volume42
Issue number1
DOIs
Publication statusPublished - 2013 Jan

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Oxygen
Defects
Ions
Cerium compounds
Oxides
Spectroscopy

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  • Chemistry(all)

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Ando, M., Oikawa, I., Ohki, S., Tansho, M., Shimizu, T., Maekawa, H., & Kiyono, H. (2013). Oxygen-17NMR study of defects in LnO1.5-CeO2 (Ln = La and Nd). Chemistry Letters, 42(1), 57-59. https://doi.org/10.1246/cl.2013.57

Oxygen-17NMR study of defects in LnO1.5-CeO2 (Ln = La and Nd). / Ando, Mariko; Oikawa, Itaru; Ohki, Shinobu; Tansho, Masataka; Shimizu, Tadashi; Maekawa, Hideki; Kiyono, Hajime.

In: Chemistry Letters, Vol. 42, No. 1, 01.2013, p. 57-59.

Research output: Contribution to journalArticle

Ando, M, Oikawa, I, Ohki, S, Tansho, M, Shimizu, T, Maekawa, H & Kiyono, H 2013, 'Oxygen-17NMR study of defects in LnO1.5-CeO2 (Ln = La and Nd)', Chemistry Letters, vol. 42, no. 1, pp. 57-59. https://doi.org/10.1246/cl.2013.57
Ando M, Oikawa I, Ohki S, Tansho M, Shimizu T, Maekawa H et al. Oxygen-17NMR study of defects in LnO1.5-CeO2 (Ln = La and Nd). Chemistry Letters. 2013 Jan;42(1):57-59. https://doi.org/10.1246/cl.2013.57
Ando, Mariko ; Oikawa, Itaru ; Ohki, Shinobu ; Tansho, Masataka ; Shimizu, Tadashi ; Maekawa, Hideki ; Kiyono, Hajime. / Oxygen-17NMR study of defects in LnO1.5-CeO2 (Ln = La and Nd). In: Chemistry Letters. 2013 ; Vol. 42, No. 1. pp. 57-59.
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N2 - The local structure around the oxide ions in LnO1.5-CeO 2 (Ln = La, Nd) was studied by using 17ONMR spectroscopy. Each spectrum of LnO1.5-CeO2 showed a broad peak due to a distribution of oxygen tetrahedra. From the peak separation, the relative numbers of oxygen tetrahedra, O[Ce]4, O[Ce]3[Ln], and O[Ce]2[Ln]2, were determined quantitatively. In the La2O3CeO2 system, the amounts of O[Ce] 4, O[Ce]3[Ln], and O[Ce]2[Ln]2 deviated from the calculated value for over 20 mol% La-doped ceria (LDC). The distribution of oxygen tetrahedra for LaO1.5CeO2 differed from those in LnO 1.5CeO2 (Ln = Nd, Y). These results suggest that the stability of the oxygen tetrahedra changes with the size of the doped ions.

AB - The local structure around the oxide ions in LnO1.5-CeO 2 (Ln = La, Nd) was studied by using 17ONMR spectroscopy. Each spectrum of LnO1.5-CeO2 showed a broad peak due to a distribution of oxygen tetrahedra. From the peak separation, the relative numbers of oxygen tetrahedra, O[Ce]4, O[Ce]3[Ln], and O[Ce]2[Ln]2, were determined quantitatively. In the La2O3CeO2 system, the amounts of O[Ce] 4, O[Ce]3[Ln], and O[Ce]2[Ln]2 deviated from the calculated value for over 20 mol% La-doped ceria (LDC). The distribution of oxygen tetrahedra for LaO1.5CeO2 differed from those in LnO 1.5CeO2 (Ln = Nd, Y). These results suggest that the stability of the oxygen tetrahedra changes with the size of the doped ions.

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