Formation of LaF3 microcrystals in sol-gel silica

Shinobu Fujihara; Chizuko Mochizuki; Toshio Kimura

doi:10.1016/S0022-3093(99)00009-5

Formation of LaF₃ microcrystals in sol-gel silica

Shinobu Fujihara, Chizuko Mochizuki, Toshio Kimura

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

65 Citations (Scopus)

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.

Original language	English
Pages (from-to)	267-274
Number of pages	8
Journal	Journal of Non-Crystalline Solids
Volume	244
Issue number	2
DOIs	https://doi.org/10.1016/S0022-3093(99)00009-5
Publication status	Published - 1999 Mar 2

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/S0022-3093(99)00009-5

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title = "Formation of LaF3 microcrystals in sol-gel silica",

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.",

author = "Shinobu Fujihara and Chizuko Mochizuki and Toshio Kimura",

note = "Funding Information: A part of this work was supported by Nippon Sheet Glass Foundation for Materials Science and Engineering (20th, 1998). Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

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AU - Fujihara, Shinobu

AU - Mochizuki, Chizuko

AU - Kimura, Toshio

N1 - Funding Information: A part of this work was supported by Nippon Sheet Glass Foundation for Materials Science and Engineering (20th, 1998). Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 1999/3/2

Y1 - 1999/3/2

N2 - 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.

AB - 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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Formation of LaF₃ microcrystals in sol-gel silica

Abstract

ASJC Scopus subject areas

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