The structure of tin borate based glasses
Hannon, Alex C., Barney, Emma R. and Holland, D. (2009) The structure of tin borate based glasses. In: 10th ESG Conference/84th Annual Meeting of theDeutsche-Glastechnisch-Gesellschaft, Frankfurt, Germany, September 30, 2009. Published in: European Journal of Glass Science and Techology. Part B. Physics and Chemistry of Glasses, Vol.50 (No.5). pp. 271-283.Full text not available from this repository.
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A series of tin borate glass samples was prepared by melting in alumina crucibles, and these were studied by means of. neutron diffraction, Al-27 and B-11 MAS (magic angle spinning) NMR, density, XRF and EDX measurements, The results show that the samples contain about 6.5 mol% Al2O3 from the crucibles, and when this was taken into account the B-O coordination numbers from neutron diffraction showed reasonable agreement with B-11 MAS NMR results. These results serve as a case study for showing the importance of sample composition for a correct analysis of diffraction results for glasses. Die presence of Al2O3 has only a small effect on the number of 4-coordinated borons because few of the aluminium are on 4-coordinated sites. For low SnO content, both the fraction of 4-coordinated borons and the mean B-O bond length increase as SnO is added. However, for greater than 50 mol% SnO the fraction of 4-coordinated borons decreases, but the mean B-O bond length remains constant, and this behaviour of the bond length is as yet unexplained. For the Sn-O coordination, the results may be interpreted as showing that for high SnO content the Sn2+ ions are predominantly on asymmetric, trigonal pyramid SnO3 sites, but that, for low SnO content the Sn2+ ions are on a mixture of asymmetric SnO3 sites and synnnetric, high coordination sites.
|Item Type:||Conference Item (Paper)|
|Subjects:||Q Science > QD Chemistry
T Technology > TP Chemical technology
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||European Journal of Glass Science and Techology. Part B. Physics and Chemistry of Glasses|
|Publisher:||Society of Glass Technology|
|Official Date:||October 2009|
|Number of Pages:||13|
|Page Range:||pp. 271-283|
|Access rights to Published version:||Restricted or Subscription Access|
|Conference Paper Type:||Paper|
|Title of Event:||10th ESG Conference/84th Annual Meeting of theDeutsche-Glastechnisch-Gesellschaft|
|Type of Event:||Conference|
|Location of Event:||Frankfurt, Germany|
|Date(s) of Event:||September 30, 2009|
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