Bowron, D.T. and Newport, R.J. and Rigden, J.S. and Tarbox, E.J. and Oversluizen, M. (1996) An X-ray absorption study of doped silicate glass, fibre optic preforms. Journal of Materials Science, 31 (2). pp. 485-490. ISSN 0022-2461.
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Optical fibre preforms, which have their germanosilicate core regions doped with small quantities of the rare-earth element erbium, have been studied using Extended X-ray Absorption Fine Structure Spectroscopy (EXAFS) at the germanium K absorption edge. These studies were performed using a circular X-ray beam of 100 mu m diameter, allowing information to be gathered as a radial function of position across the core region of the preform. This positioning was accomplished by means of a motorized pinhole collimator and sample stage developed for use on the focused X-ray beamline 8.1, at the SRS, Daresbury Laboratory, UK. The EXAFS results are consistent with the germanium sites coordinated to surrounding oxygen atoms at a mean distance of 0.17 nm. Absorption maps of the rare-earth and germanium distribution across the core region of the preforms have also been obtained, showing a correlation between the distributions of the two atom types.
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group|
|Depositing User:||J.M. Smith|
|Date Deposited:||29 Apr 2009 15:17|
|Last Modified:||06 Sep 2011 01:52|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/15868 (The current URI for this page, for reference purposes)|
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