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The citrate process was successfully used to prepare a glass–ceramic powder with the stoichiometric composition of BaAl 2 Si 2 O 8 (BAS 2 ). The solutions of barium and aluminum nitrate, colloidal silica, citric acid, and diethylene glycol were combined and afforded a clear gel on mixing which was further decomposed on heating to an easily handled precursor in a powder...
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