Anderson, R. and Brennan, T. and Cole, J.M. and Mountjoy, G. and Pickup, D.M. and Newport, R.J. and Saunders, G.A. (1999) An extended x-ray absorption fine structure study of rare-earth phosphate glasses near the metaphosphate composition. Journal of Materials Research, 14 (12). pp. 4706-4714. ISSN 0884-2914.
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| Official URL http://dx.doi.org/10.1557/JMR.1999.0637 |
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Abstract
A variable-temperature (79, 145, and 293 K) extended x-ray absorption fine structure study, using rare-earth L-III absorption edges, is reported for phosphate glasses doped with rare-earth elements (R, where R = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, and Er) with compositions close to metaphosphate, R(PO3)(3). The results yield nearest-neighbor R-O distances that demonstrate the lanthanide contraction in a glassy matrix and an R-O coordination intermediate between 6 and 7 for ran-earth ions with smaller atomic number (Z) and 6 for rare-earth ions with larger Z, Thermal parameters show no significant changes in R-O distances or coordination numbers between 293 and 79 K. There is evidence of an R-P correlation between 3.3 and 3.6 Angstrom and the beginning of a second R-O correlation at approximately 4 Angstrom. No R-R correlations up to a distance of approximately 4 ii were observed.
| Item Type: | Article |
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| Subjects: | Q Science |
| Divisions: | Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group |
| Depositing User: | J.M. Smith |
| Date Deposited: | 08 May 2009 16:07 |
| Last Modified: | 02 Dec 2011 11:52 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/15861 (The current URI for this page, for reference purposes) |
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