Abstract
A novel sol–gel process for silica/fluoride composites is described. Crystallization of LaF 3 in the sol–gel silica has been investigated. Dry silica gels containing La 3+ and trifluoroacetate ions (CF 3COO −) were produced from tetramethylorthosilicate (TMOS), methanol, dimethylformamide, lanthanum acetate, trifluoroacetic acid, water and nitric acid. By heating the gels at temperatures above 300°C, LaF 3 microcrystals with a size of 10–30 nm were formed in the silica matrix. IR, XPS and TG-DTA analyses suggested that CF 3COO − ions are coordinated to La 3+ ions in the sols and the dried gels, leading to the formation of LaF 3 by the thermal decomposition at elevated temperatures.
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