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- W2522181036 abstract "High resolution x-ray photoelectron spectroscopy (HRXPS) has been used to obtain binding energy information for the Pb 4f, 4d and 5d, Si 2p, Na 1s, Li 1s and Ols photoelectron peaks, along with the O KLL Auger transitions and valence band spectra, in glasses of general formula xPbO (1-x)SiO 2 (0≤x≤0≤67) and xPbO (0.3-x)R 2 O 0.7SiO 2 (0≤x≤0≤3 R=Na, Li). The binding energy changes with composition are used to infer polarising powers for the Pb 2+ , Li + and Na + ions and, whilst these are consistent with simple cation potentials for Li + and Na + , this is not true for Pb 2+ which appears to be more highly electron donating. This suggests that the inert pair of electrons are involved in enhancing charge density in the Pb-O bonds and hence confer a degree of network intermediate behaviour on PbO in lead silicate glasses. The intensity distribution in the O Is photoelectron peaks from the lead silicate binary glasses can be explained by disproportionation of some Pb-O-Si species to give Pb-O-Pb and Si-O-Si. The Pb-O-Pb links are sufficiently covalent to maintain the network which would not be possible with R + -O-R + links. There is no evidence for 3-coordinated oxygens from the O Is data. Physical property data for the binary glasses are consistent with a reduced modifier behaviour of PbO and values for the ternaries generally follow a linear interpolation between end members." @default.
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- W2522181036 date "2001-12-01" @default.
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- W2522181036 title "Atomic environments in binary lead silicate and ternary alkali lead silicate glasses" @default.
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