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A Study of Rare Earth Doped Silicate and Phosphate Glasses.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A Study of Rare Earth Doped Silicate and Phosphate Glasses./
Author:	Bowron, Daniel Timothy.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1994,
Description:	195 p.
Notes:	Source: Dissertations Abstracts International, Volume: 70-12, Section: B.
Contained By:	Dissertations Abstracts International70-12B.
Subject:	Construction. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=U482430
ISBN:	9798790674761

A Study of Rare Earth Doped Silicate and Phosphate Glasses.
Bowron, Daniel Timothy.

A Study of Rare Earth Doped Silicate and Phosphate Glasses. - Ann Arbor : ProQuest Dissertations & Theses, 1994 - 195 p.

Source: Dissertations Abstracts International, Volume: 70-12, Section: B.

Thesis (Ph.D.)--University of Kent (United Kingdom), 1994.

This item is not available from ProQuest Dissertations & Theses.

The complementary techniques of X-ray diffraction and EXAFS have been applied to silicate and phosphate glass systems containing varying quantities of rare earth elements.The silicate systems that have been studied are rare earth doped fibre optic preforms of interest to the optoelectronics and telecommunications industry. Techniques were developed to allow spatially resolved diffraction and EXAFS data to be taken from the small ~1mm diameter core region of the preforms. Absorption maps were made displaying the distribution of the rare earth ions as a function of radial position, and similarly for the germanium codopant incorporated in these systems. The diffraction results show as expected, that silica dominates the structure evident in the preforms whilst EXAFS measurements taken at the germanium K-edge, suggest that this codopant occupies an eightfold coordinated site surrounded by oxygen atoms at 1.7A.The phosphate glasses studied are rare earth metaphosphates of the composition R(PO3)3. X-ray diffraction measurements were taken showing that the network structure of these systems is essentially constructed from PO4 tetrahedra. The EXAFS experiments, performed on a range of glasses over the rare earth LIII edges, show a trend in the first shell distance rare earth-oxygen, consistent with the Lanthanide contraction, the rare earth ions occupy-ing sites with between six and eight-fold coordination of oxygen atoms about the rare earth ions.

ISBN: 9798790674761Subjects--Topical Terms:

3561054
Construction.

A Study of Rare Earth Doped Silicate and Phosphate Glasses.
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005 20220719070544.5
008 241004s1994 ||||||||||||||||| ||eng d
020 $a 9798790674761
035 $a (MiAaPQ)AAIU482430
035 $a (MiAaPQ)UnivKentCanterbury38697
035 $a AAIU482430
040 $a MiAaPQ $c MiAaPQ
100 1 $a Bowron, Daniel Timothy. $3 3686463
245 1 0 $a A Study of Rare Earth Doped Silicate and Phosphate Glasses.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1994
300 $a 195 p.
500 $a Source: Dissertations Abstracts International, Volume: 70-12, Section: B.
500 $a Advisor: Newport, Bob.
502 $a Thesis (Ph.D.)--University of Kent (United Kingdom), 1994.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a The complementary techniques of X-ray diffraction and EXAFS have been applied to silicate and phosphate glass systems containing varying quantities of rare earth elements.The silicate systems that have been studied are rare earth doped fibre optic preforms of interest to the optoelectronics and telecommunications industry. Techniques were developed to allow spatially resolved diffraction and EXAFS data to be taken from the small ~1mm diameter core region of the preforms. Absorption maps were made displaying the distribution of the rare earth ions as a function of radial position, and similarly for the germanium codopant incorporated in these systems. The diffraction results show as expected, that silica dominates the structure evident in the preforms whilst EXAFS measurements taken at the germanium K-edge, suggest that this codopant occupies an eightfold coordinated site surrounded by oxygen atoms at 1.7A.The phosphate glasses studied are rare earth metaphosphates of the composition R(PO3)3. X-ray diffraction measurements were taken showing that the network structure of these systems is essentially constructed from PO4 tetrahedra. The EXAFS experiments, performed on a range of glasses over the rare earth LIII edges, show a trend in the first shell distance rare earth-oxygen, consistent with the Lanthanide contraction, the rare earth ions occupy-ing sites with between six and eight-fold coordination of oxygen atoms about the rare earth ions.
590 $a School code: 5021.
650 4 $a Construction. $3 3561054
650 4 $a Phosphorus. $3 671778
650 4 $a Spectrum analysis. $3 520440
650 4 $a Lasers. $3 535503
650 4 $a Trace elements. $3 602273
650 4 $a Computer simulation. $3 525602
650 4 $a Silica. $3 587794
650 4 $a Optical properties. $3 3560260
650 4 $a Physical properties. $3 3564184
650 4 $a Optics. $3 517925
650 4 $a X-rays. $3 604695
650 4 $a Analytical chemistry. $3 3168300
650 4 $a Civil engineering. $3 860360
650 4 $a Condensed matter physics. $3 3173567
690 $a 0752
690 $a 0486
690 $a 0543
690 $a 0611
710 2 $a University of Kent (United Kingdom). $3 3642032
773 0 $t Dissertations Abstracts International $g 70-12B.
790 $a 5021
791 $a Ph.D.
792 $a 1994
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=U482430