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Structural Studies of Rare-Earth Doped Phosphate Glasses

Published online by Cambridge University Press:  10 February 2011

A. Matic ,
L. Börjesson ,
A. Wannberg  and
R. L. McGreevy
A. Matic
Affiliation:
Dept. of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden, matic@fy.chalmers.se
L. Börjesson
Affiliation:
Dept. of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden, matic@fy.chalmers.se
A. Wannberg
Affiliation:
Studsvik Neutron Research Laboratory, S-611 82 Nyköping, Sweden
R. L. McGreevy
Affiliation:
Studsvik Neutron Research Laboratory, S-611 82 Nyköping, Sweden
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Abstract

We have performed neutron scattering experiments on rare-earth (La, Pr, Ho) doped phosphate glasses around the metaphosphate composition R(PO3)3. Combining the diffraction experiment with Reverse Monte Carlo simulations we obtain a 3-D model of the structure. Our models propose a rare-earth ion environment primarily consisting of oxygens with the average rare earth-oxygen distances; 2.56, 2.51 and 2.40 Å for the La, Pr and Ho samples respectively. We also observe that the rare earth ions are not uniformly distributed. The first R-R shell is on avergae about 3.3 Å to be compared with a value of 7 Å for a uniform distribution of R ions in the structure. From the models we also conclude that a chain like structure of the phosphate network is in agreement with the experiment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 435
Copyright
Copyright © Materials Research Society 1997

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References

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