Alderman, Oliver L. G., Hannon, Alex C., Holland, Diane and Umesaki, Norimasa (2014) On the germanium–oxygen coordination number in lead germanate glasses. Journal of Non-Crystalline Solids, Volume 386 . pp. 56-60. doi:10.1016/j.jnoncrysol.2013.11.032 ISSN 0022-3093.

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Abstract

Knowledge of the Ge–O coordination number, nGeO, in germanate glasses is of paramount importance for understanding the germanate anomaly and relating the glass structure to its thermophysical properties. By careful measurement using high resolution neutron diffraction on two samples of 40PbO.60GeO2 glass, it is clearly demonstrated that the average Ge–O coordination number, nGeO, is much less than the value, 4.77(5), previously obtained by use of neutron diffraction [Umesaki et al., Physica B 213 (1995) 490]. However, it is also clear that nGeO is still significantly greater than four (~ 4.1), and this is supported by the observed asymmetry of the Ge–O peak in the real-space total correlation functions. The average Pb–O coordination number is a little in excess of three, typical of Pb2 + with a sterically active lone-pair of electrons.

Item Type:	Journal Article
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:	15 February 2014
Dates:	Date Event 15 February 2014 Published 11 December 2013 Available 8 October 2013 Submitted
Volume:	Volume 386
Page Range:	pp. 56-60
DOI:	10.1016/j.jnoncrysol.2013.11.032
Status:	Peer Reviewed
Publication Status:	Published

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