TY - JOUR
T1 - Local structure of cerium in aluminophosphate and silicophosphate glasses
AU - Rygel, Jennifer L.
AU - Chen, Yongsheng
AU - Pantano, Carlo G.
AU - Shibata, Tomohiro
AU - Du, Jincheng
AU - Kokou, Leopold
AU - Woodman, Robert
AU - Belcher, James
PY - 2011/8
Y1 - 2011/8
N2 - 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.
AB - 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.
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U2 - 10.1111/j.1551-2916.2011.04596.x
DO - 10.1111/j.1551-2916.2011.04596.x
M3 - Article
AN - SCOPUS:80051498138
SN - 0002-7820
VL - 94
SP - 2442
EP - 2451
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 8
ER -