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

Published online by Cambridge University Press:  31 January 2011

R. Anderson ,
T. Brennan ,
J. M. Cole ,
G. Mountjoy ,
D. M. Pickup ,
R. J. Newport  and
G. A. Saunders
R. Anderson
Affiliation:
School of Physical Sciences, The University of Kent, Canterbury, CT2 7NR, United Kingdom
T. Brennan
Affiliation:
School of Physics, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom
J. M. Cole*
Affiliation:
School of Physical Sciences, The University of Kent, Canterbury, CT2 7NR, United Kingdom
G. Mountjoy
Affiliation:
School of Physical Sciences, The University of Kent, Canterbury, CT2 7NR, United Kingdom
D. M. Pickup
Affiliation:
School of Physical Sciences, The University of Kent, Canterbury, CT2 7NR, United Kingdom
R. J. Newport
Affiliation:
School of Physical Sciences, The University of Kent, Canterbury, CT2 7NR, United Kingdom
G. A. Saunders
Affiliation:
School of Physics, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom
*
a)Address all correspondence to this author. Present address: Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom. e-mail: jmc61@cam.ac.uk
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Abstract

A variable-temperature (79, 145, and 293 K) extended x-ray absorption fine structure study, using rare-earth LIII 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 rare-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 Å and the beginning of a second R–O correlation at approximately 4 Å. No R–R correlations up to a distance of approximately 4 Å were observed.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4706 - 4714
Copyright
Copyright © Materials Research Society 1999

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