An extended x-ray absorption fine structure study of rare-earth phosphate glasses near the metaphosphate composition

Anderson, Ruth and Brennan, Tessa and Cole, Jacqueline M. and Mountjoy, Gavin and Pickup, David M. and Newport, Robert 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. (Full text available)

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http://dx.doi.org/10.1557/JMR.1999.0637

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
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: 11 Apr 2014 13:06
Resource URI: http://kar.kent.ac.uk/id/eprint/15861 (The current URI for this page, for reference purposes)
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