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

応用化学科

研究成果: Article › 査読

98 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
巻	244
号	2
DOI	https://doi.org/10.1016/S0022-3093(99)00009-5
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

文献へのアクセス

10.1016/S0022-3093(99)00009-5

他のファイルとリンク

引用スタイル

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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 - 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.

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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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