X-ray diffraction studies of rare-earth metaphosphate glasses

Bowron, Daniel Timothy and Bushnell-Wye, Graham and Newport, Robert J. and Rainford, B.D. and Saunders, George A. (1996) X-ray diffraction studies of rare-earth metaphosphate glasses. Journal of Physics: Condensed Matter, 8 (19). pp. 3337-3346. ISSN 0953-8984. (Full text available)

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http://dx.doi.org/10.1088/0953-8984/8/19/009

Abstract

X-ray diffraction measurements have been performed at the Synchrotron Radiation Source, Daresbury, UK, in a structural study of the rare-earth metaphosphate glasses (Pr2O3)(0.216)(P2O5)(0.794), (Eu2O3)(0.252)(P2O5)(0.748) and (Tb2O3)(0.26)(P2O5)(0.74), whose compositions were determined by electron microprobe analysis. Such rare-earth metaphosphate glasses R(PO3)(3) containing high concentrations of rare-earth R(3+) ions are of growing interest in fundamental studies of magnetic glasses and in optical communications and laser technologies. The diffraction results prove to be consistent with a network model which is dominated by a phosphate glass skeleton having three-dimensional connectivity, constructed from PO4 tetrahedra linked to adjacent tetrahedra via bridging oxygen atoms. Results relating to rare-earth-oxygen correlations are consistent with a sixfold to eightfold coordination of the rare-earth atoms, with distances showing the trends expected from the lanthanide contraction: a reduction of the rare-earth ionic radii with increasing atomic number.

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: 28 Apr 2009 15:48
Last Modified: 17 Jul 2014 11:55
Resource URI: http://kar.kent.ac.uk/id/eprint/15866 (The current URI for this page, for reference purposes)
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