Anderson, Ruth and Brennan, Tessa and Cole, Jacqueline M. and Mountjoy, Gavin and Pickup, David M. and Newport, Robert J. and Saunders, George A. (1999) An extended x-ray absorption fine structure study of rare-earth phosphate glasses near the metaphosphate composition. MATERIALS RESEARCH SOCIETY, 506 KEYSTONE DR, WARRENDALE, PA 15086 USA (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)
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.
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences|
|Depositing User:||M. Nasiriavanaki|
|Date Deposited:||25 Jul 2009 14:38|
|Last Modified:||11 Apr 2014 13:10|
|Resource URI:||https://kar.kent.ac.uk/id/eprint/17022 (The current URI for this page, for reference purposes)|