89Y Magic-Angle Spinning NMR of Y2Ti2–xSnxO7 Pyrochlores

Sharon Elizabeth Ashbrook, Karl R Whittle, Gregory R Lumpkin, Ian Farnan

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

The yttrium local environment in the series of pyrochlores Y2Ti2-xSnxO7 was studied using Y-89 NMR. Oxides with the pyrochlore structure exhibit a range of interesting physical and chemical properties, resulting in many technological applications, including the encapsulation of lanthanide- and actinide-bearing radioactive waste. The use of the nonradioactive Y3+ cation provides a sensitive probe for any changes in the local structure and ordering with solid solution composition, through Y-89 ( I = 1/2) NMR. We confirm that a single pyrochlore phase is formed over the entire compositional range, with Y found only on the eight-coordinated A site. A significant ( similar to 15 ppm) chemical shift is observed for each Sn substituted into the Y second neighbor coordination environment. The spectral signal intensities of the possible combinations of Sn/Ti neighbors match those predicted statistically assuming a random distribution of Sn4+/Ti4+ on the six-coordinated pyrochlore B site.

Original languageEnglish
Pages (from-to)10358-10364
Number of pages7
JournalJournal of Physical Chemistry B
Volume110
Issue number21
DOIs
Publication statusPublished - 1 Jun 2006

Keywords

  • SOLID-STATE
  • SPECTRA

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