¹⁷O solid-state NMR spectroscopy of A₂B₂O₇ oxides: quantitative isotopic enrichment and spectral acquisition?

ABSTRACT: The potential of ¹⁷O NMR spectroscopy for the investigation of A₂B₂O₇ ceramic oxides important in the encapsulation of radioactive waste is demonstrated, with post-synthetic enrichment by exchange with ¹⁷O₂ gas. For Y₂Sn₂O₇, Y₂Ti₂O₇ and La₂Sn₂O₇ pyrochlores, enrichment of the two distinct O species is clearly non quantitative at lower temperatures (∼700 °C and below) and at shorter times, despite these being used in prior work, with preferential enrichment of OA₂B₂ favoured over that of OA₄. At higher temperatures, the ¹⁷O NMR spectra suggest that quantitative enrichment has been achi

SUBMITTER: Fernandes A 

PROVIDER: S-EPMC5815285 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature