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Published online by Cambridge University Press: 15 February 2011
The principal problem in developing a theory of internal nucleation lies inthe constitution of the nascent nuclei. To get at this constitution in aninternally nucleating glass, oxygen and lithium core level x-rayphotoelectron spectra have been measured on glassy and nucleated lithiumdisilicate and on the three stable crystalline compounds in the Li2O-SiO2 system. Our results indicate thatnucleated lithium disilicate glass consists of completely polymerized silicain the formation of which non-bridging oxygens are consumed. During thissilica polymerization lithium atoms move away from presumably four-foldcoordinated sites towards higher coordinated ones.