Formation of LaF3 microcrystals in sol-gel silica

Shinobu Fujihara, Chizuko Mochizuki, Toshio Kimura

研究成果: Article査読

94 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)267-274
ページ数8
ジャーナルJournal of Non-Crystalline Solids
244
2
DOI
出版ステータスPublished - 1999 3月 2

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 凝縮系物理学
  • 材料化学

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