Mountjoy, Gavin, Cole, Jacqueline M., Brennan, Tessa, Newport, Robert J., Saunders, George A., Wallidge, Graham (2001) A rare earth L-3-edge EXAFS and L-1-edge XANES study of Ce, Nd and Eu phosphate glasses and crystals in the composition range from metaphosphate to ultraphosphate. Journal of Non-Crystalline Solids, 279 (1). pp. 20-27. ISSN 0022-3093. (doi:10.1016/S0022-3093(00)00406-3) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:8212)
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Official URL: http://dx.doi.org/10.1016/S0022-3093(00)00406-3 |
Abstract
Rare earth (R) phosphate glasses, (R2O3)(x)(P2O5)(1-x), can be prepared with compositions in the range from ultra-phosphate,x = 0.17 (RP5O14), to metaphosphate, x = 0.25 (RP3O9), and it is important to know whether the R-O coordination changes significantly with composition. In rare earth phosphate crystals, the number of nearest neighbour oxygens changes from eight for ultraphosphate to six for metaphosphate. These R-O correlations are clearly distinguished in L-3-edge extended X-ray absorption spectroscopy (EXAFS) of NdP5O14 and EuP3O9 crystals. Samples of Ce (x = 0.197 and 0.235), Nd (x = 0.187) and Eu (x = 0.218) phosphate glasses all show the same EXAFS and L-1-edge X-ray absorption near edge structures (XANES) results. The results indicate an R-O coordination with six nearest neighbour oxygens, a similar level of static disorder to that in rare earth phosphate crystals and reduced centrosymmetry. There is no evidence for a change in R-O coordination with changing x. (C) 2001 Elsevier Science B.V. All rights reserved.
Item Type: | Article |
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DOI/Identification number: | 10.1016/S0022-3093(00)00406-3 |
Uncontrolled keywords: | Absorption fine-structure; Ray; Spectroscopy; Diffraction; Edges; XAS; PR |
Subjects: | Q Science > QC Physics |
Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
Depositing User: | Robert Newport |
Date Deposited: | 26 Jun 2008 17:08 UTC |
Last Modified: | 05 Nov 2024 09:40 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/8212 (The current URI for this page, for reference purposes) |
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