Abstract
The structural role of Zn(II) in borosilicate glasses has been investigated by comparing X-ray diffraction data from a glass of the system Na 2OLi 2OZnOSiO 2B 2O 2 with those obtained from a Zn-free borosilicate matrix and from a sample having nearly the same composition, but containing CoO instead of ZnO. Difference radial distribution curves were calculated in order to determine the environment of Zn(II) and Co(II) atoms. It is concluded that both transition metal atoms are surrounded by approximately four oxygen neighbours at distances expected for fourfold coordination.
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