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A neutron diffraction and Tl-205 NMR study of the thallium germanate glass system
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Barney, Emma R., Hannon, Alex C., Laorodphan, Nattapol, Dupree, Ray and Holland, Diane (2010) A neutron diffraction and Tl-205 NMR study of the thallium germanate glass system. In: 12th International Conference on the Physics of Non-Crystalline Solids (PNCS12), Foz do Iguacu, Brazil, 06-09 Sep 2009. Published in: Journal of Non-Crystalline Solids, Vol.356 (No.44-49 Sp. Iss. SI). pp. 2517-2523. doi:10.1016/j.jnoncrysol.2010.03.026 ISSN 0022-3093.
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Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2010.03.026
Abstract
Neutron diffraction data, measured for two thallium germanate glass compositions, are presented and compared with previously published data for caesium germanate glasses. The measured coordination number, n(Ge-O), for the 10 mol%Tl2O thallium germanate glass is in good agreement with the average coordination number measured for the equivalent caesium germanate. However, while n(Ge-O) declines for caesium germanate glasses as the amount of modifier increases above 18 mol% Cs2O, n(Ge-O) for the 30 mol% Tl2O thallium germanate glass remains high with, on average, 4.40 +/- 0.03 oxygen neighbours per germanium. The difference in behaviour of the germanium coordination, compared to caesium germanate glasses, arises from a change in the average thallium environment, as the role of the thallium changes from that of a modifier (similar to an alkali), to a role where some of the thallium atoms act as network formers. This is supported by Tl-205 NMR measurements which indicate the presence of two thallium environments. (C) 2010 Elsevier B.V. All rights reserved.
Item Type: | Conference Item (Paper) | ||||
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Subjects: | T Technology > TP Chemical technology T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Journal of Non-Crystalline Solids | ||||
Publisher: | Elsevier Science BV | ||||
ISSN: | 0022-3093 | ||||
Official Date: | 1 October 2010 | ||||
Dates: |
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Volume: | Vol.356 | ||||
Number: | No.44-49 Sp. Iss. SI | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 2517-2523 | ||||
DOI: | 10.1016/j.jnoncrysol.2010.03.026 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Conference Paper Type: | Paper | ||||
Title of Event: | 12th International Conference on the Physics of Non-Crystalline Solids (PNCS12) | ||||
Type of Event: | Conference | ||||
Location of Event: | Foz do Iguacu, Brazil | ||||
Date(s) of Event: | 06-09 Sep 2009 |
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