Glasses alkali-lead silicate

Then and Pantano used XPS to characterize changes in the surface of an alkali lead silicate glass on reduction with hydrogen at 5(X)°C. The reduction in the intensity of the non-bridging oxygen O Is peak was correlated with the formation of metallic lead which could evaporate from the surface leaving a silica rich layer (Then and Pantano, 1990). 

Lead silicate glasses having different mole ratios of Si02 to PbO and containing different amounts of alkali/alkaline earth metal oxides were prepared by conventional melt-quench method. The different structural units of Si present in these glasses were identified by Si MAS NMR. ... 

Cu-sheathed wire 8095 Alkali-lead silicate, high electrical insula- Lead glass, stem glass for electric lamps... 

The alkali silicate glasses are easily corroded by aqueous acids and the main reaction is an exchange between H3O+ of the solution with the alkali M+ of the glass the corrosion rate increaseswith the ionic radii ofM+, that is, K > Na" " > Li" ". The chemical durability is greatly increased by addition of divalent CaO or trivalent AI2O3 oxides, leading to commercial soda-lime-silica compositions. 

Flint glass is a high-dispersion, lead-alkali silicate glass originally made by melting flint rock, which is a... 

Infinite A leads to the binary model, whilst A = 0 leads to a completely random distribution. Gurman found that the lithium silicate glasses have AE/kT = 1.5 0.5[21j.However, some NMR data [20,22, 23] from alkali-silicate glass systems support the binary model. On the other hand, other NMR data [24,25, 26, 27] and a Raman investigation[28] support the bondordering model. 

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