Formation of LaF3 microcrystals in sol–gel silica

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書誌事項

公開日
1999-03
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/s0022-3093(99)00009-5
公開者
Elsevier BV

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説明

Abstract A novel sol–gel process for silica/fluoride composites is described. Crystallization of LaF3 in the sol–gel silica has been investigated. Dry silica gels containing La3+ and trifluoroacetate ions (CF3COO−) were produced from tetramethylorthosilicate (TMOS), methanol, dimethylformamide, lanthanum acetate, trifluoroacetic acid, water and nitric acid. By heating the gels at temperatures above 300°C, LaF3 microcrystals with a size of 10–30 nm were formed in the silica matrix. IR, XPS and TG-DTA analyses suggested that CF3COO− ions are coordinated to La3+ ions in the sols and the dried gels, leading to the formation of LaF3 by the thermal decomposition at elevated temperatures.

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