The influence of temperature on the Ti4+ coordination in sodium titanosilicate melts: In-situ high-temperature Raman spectroscopy study

被引：3

作者：

Osipov, Armenak A. ^{[1
]}

Osipova, Leyla M. ^{[1
]}

Liska, Marek ^{[2
,3
]}

机构：

[1] RAS, Inst Mineral, South Urals Fed Res Ctr Mineral & Geoecol, Urals Branch, Miass 456317, Chelyabinsk Reg, Russia

[2] A Dubcek Univ Trencin, FunGlass, Studentska 2, SK-91150 Trencin, Slovakia

[3] FChPT STU, VILA Joined Glass Ctr IIC SAS, TnUAD, Studentska 2, SK-91150 Trencin, Slovakia

来源：

VIBRATIONAL SPECTROSCOPY | 2021年 / 117卷

关键词：

Melt structure; Titanium coordination; Raman spectroscopy; SILICATE-GLASSES; BEHAVIOR; SPECTRA; NA;

D O I：

10.1016/j.vibspec.2021.103308

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The structure of xTiO(2)-(100-x)[40Na(2)O-60SiO(2)] (x = 10, 15, 25 and 30 mol%) glasses and melts was studied in situ in the temperature range of 20-1150 degrees C using high-temperature Raman spectroscopy. The fraction of five-fold coordinated Ti4+ ions gradually decreases as temperature increases above similar to 600 degrees C in the samples with x <= 25 mol%. No similar changes were found for the sample with x = 30 mol%. The change in titanium coordination is related to the transformation of square-based TiO5 pyramids into TiO4 tetrahedra with the formation of additional non-bridging oxygen atoms (NBO) in the melt structure. This transformation can be described by [TiO4O](2-) + SiO3O- <-> TiO3O- + SiO2O22- and [TiO4O](2-) + SiO4 <-> TiO3O- + SiO3O- (O is bridging oxygen atom) disproportional reactions, which are shifted toward the right with increasing temperature. All studied melts exhibit a more uniform titanium distribution in comparison with glasses of corresponding composition.

引用

页数：6

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