Abstract
The local structures of Nd3+ and Er3+ ions in two series of rare-earth (RE) phosphate glasses with nominal compositions xR203-(1-x)P2O5, where R=Nd and Er and 0.05≤x≤0.28, have been characterized by LIII-edge extended x-ray-absorption fine-structure spectroscopy (EXAFS). The RE coordination number depends on the R2O3 content, decreasing from 9.0 (10) oxygen nearest neighbors in ultraphosphate compositions (x<0.15) to 6.4 (9) oxygen nearest neighbors for the metaphosphate (x∼0.25) compositions. The average Er-O bond distance decreases from 2.29 (1) to 2.23 (1) Å, and the average Nd-O bond distance decreases from 2.40 (1) to 2.37 (1) Å over the same compositional range. The changes in coordination environments are consistent with the conversion of isolated RE polyhedra to clustered RE polyhedra sharing common oxygens as the number of available terminal oxygens per RE ion decreases with increasing x.
Recommended Citation
M. Karabulut et al., "Neodymium and Erbium Coordination Environments in Phosphate Glasses," Physical Review B - Condensed Matter and Materials Physics, American Physical Society (APS), Jan 2002.
The definitive version is available at https://doi.org/10.1103/PhysRevB.65.104206
Department(s)
Materials Science and Engineering
International Standard Serial Number (ISSN)
1098-0121; 1550-235X
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2002 American Physical Society (APS), All rights reserved.
Publication Date
01 Jan 2002
