Barney, Emma R., Hannon, Alex C., Laorodphan, Nattapol, Dupree, Ray and Holland, D. (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.

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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)
Subjects:	T Technology > TP Chemical technology T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Journal of Non-Crystalline Solids
Publisher:	Elsevier Science BV
ISSN:	0022-3093
Date:	1 October 2010
Volume:	Vol.356
Number:	No.44-49 Sp. Iss. SI
Number of Pages:	7
Page Range:	pp. 2517-2523
Identification Number:	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
URI:	http://wrap.warwick.ac.uk/id/eprint/4613

Data sourced from Thomson Reuters' Web of Knowledge

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