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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Substitutional tin-doped silica glasses: an infrared study of the sol-gel transition
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Substitutional tin-doped silica glasses: an infrared study of the sol-gel transition

机译：替代锡掺杂的二氧化硅玻璃：溶胶-凝胶转变的红外研究

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A new sol-gel route using tetraethoxysilane (TEOS) and dibutyltindiacetate (DBTDA) as precursors allowed the preparation of Sn-doped SiO2 glasses with a content of substitutional Sn atoms in regular Si sites up to 1.4 wt%, SnO2/(SnO2 + SiO2). Glasses with higher Sn content ( greater than or equal to 1.6 wt%.) showed a crystalline nanophase of SnO2 dispersed throughout the silica matrix. The hydrolysis and condensation reactions of TEOS and DBTDA were investigated by FTIR spectroscopy during sol-gel transition in order to understand the mechanism, at molecular level. which gives rise to substitutional Sn-doping or to SnO2 clustering. It was found that the hydrolysis of DBTDA was faster than TEOS. Hydrolyzed DBTDA acted as a crosslinker between molecules of hydrolyzed TEOS. Since tin atoms preferentially link to silicon atoms via bridging oxygens, no aggregation of Sn atoms occurred in sot and gel phases. Also in the Sti-doped SiO2 samples with Sn content greater than or equal to 1.6 wt% no aggregation of Sn atoms was observed in the xerogels. Segregation of SnO2 occurred during the thermal treatment to obtain glass. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 20]
机译：使用四乙氧基硅烷（TEOS）和二乙酸二丁锡（DBTDA）作为前体的新溶胶-凝胶路线允许制备掺锡的SiO2玻璃，其在常规Si位置的取代Sn原子含量高达1.4 wt％，SnO2 /（SnO2 + SiO2 ）。具有较高Sn含量（大于或等于1.6 wt％）的玻璃显示SnO2的晶体纳米相分散在整个二氧化硅基质中。在溶胶-凝胶转变过程中，通过FTIR光谱研究了TEOS和DBTDA的水解和缩合反应，以便从分子水平了解其机理。这引起了替代性的Sn掺杂或SnO2团簇。发现DBTDA的水解比TEOS快。水解的DBTDA充当水解的TEOS分子之间的交联剂。由于锡原子优先通过桥连氧连接至硅原子，因此在汽相和凝胶相中均未发生锡原子的聚集。同样在锡含量大于或等于1.6重量％的Sti掺杂的SiO 2样品中，在干凝胶中未观察到Sn原子的聚集。在热处理过程中，SnO2发生了偏析，从而获得了玻璃。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：20]

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