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An interesting observation is reported on the dramatic effect of HNO3 on crystalline phase evolution in the 33.3 mol% Li2O–SiO2 glass–ceramic (stoichiometric composition of lithium disilicate Li2Si2O5, LS2) prepared by sol–gel processes from tetraethylorthosilicate (TEOS) and lithium ethoxide precursors. Nitric acid (65%), in molar ratio HNO3/TEOS = 0.1, was added either to the precursor sol or to...
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