Local structure of cerium in aluminophosphate and silicophosphate glasses

Jennifer L. Rygel, Yongsheng Chen, Carlo G. Pantano, Tomohiro Shibata, Jincheng Du, Leopold Kokou, Robert Woodman, James Belcher

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21 Scopus citations

Abstract

The local structure of cerium in two systematic compositional series of glasses, nominally CeP3O9-AlP3O9 and CeP3O9-SiP2O7, was interrogated using X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) spectroscopy. XPS revealed that, for glasses melted in air, ≥yen;95% of cerium ions are Ce3+. This was independently confirmed using X-ray absorption near edge spectroscopy (XANES). Ce K-edge extended X-ray absorption fine structure (EXAFS) has been used to determine the local structure of Ce 3+. Near the metaphosphate composition, cerium was found to have an average cerium coordination number of ~7.0 and an average cerium-oxygen bond length of 2.41 Å. The average cerium coordination number and average cerium-oxygen bond distance were found to increase with decreasing cerium concentration in both compositional series. Rare-earth clustering is suggested based on numerical calculations for glasses containing ≥yen;14 and ≥yen;15 mol% Ce2O3 for the aluminophosphate and silicophosphate series, respectively.

Original languageEnglish (US)
Pages (from-to)2442-2451
Number of pages10
JournalJournal of the American Ceramic Society
Volume94
Issue number8
DOIs
StatePublished - Aug 1 2011

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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    Rygel, J. L., Chen, Y., Pantano, C. G., Shibata, T., Du, J., Kokou, L., Woodman, R., & Belcher, J. (2011). Local structure of cerium in aluminophosphate and silicophosphate glasses. Journal of the American Ceramic Society, 94(8), 2442-2451. https://doi.org/10.1111/j.1551-2916.2011.04596.x