Distribution and Coordination State of Titanium Oxides in Microstructures Formed by Spinodal Decomposition in Multicomponent Borosilicate Glass

Suzuki, Masanori; Tanaka, Toshihiro

ISIJ International, 2010, 50(4), 509-514

Number of Access:558（2025-08-14 15:06 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/26382

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Title
Distribution and Coordination State of Titanium Oxides in Microstructures Formed by Spinodal Decomposition in Multicomponent Borosilicate Glass
Creator
NRID
1000020610728 1000020610728
ORCID
0000-0003-1601-2842 0000-0003-1601-2842
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eternalblue eternalblue
Scopus Author ID
56297002300 56297002300
CreatorName
Suzuki, Masanori
NRID
1000010179773 1000010179773
researchmap permalink
read0013978 read0013978
CreatorName
Tanaka, Toshihiro
Subject
tetrahedrally coordinated titanium oxide
phase separation
porous glass
Gibbs energy
super-cooled liquid phase
Abstract
Tetrahedrally coordinated titanium oxides implanted into inorganic materials aid in the removal of air-based pollutants by photocatalytic reactions. We investigated the distribution and the coordination state of titanium oxides in a phase-separated glass formed by the spinodal decomposition to obtain porous glass containing tetrahedrally coordinated titanium oxides. Various glass compositions containing titanium oxides were prepared by partially replacing SiO_2 with B_2O_3 and small amounts of TiO_2 in multicomponent silicate glass compositions where a spinodal decomposition had been confirmed. Interconnected microstructures that consist of two different phases were observed in heat-treated glass samples using transmission electron microscopy and these microstructures underwent spinodal decomposition. Compositional analyses of these microstructures using energy dispersion spectroscopy revealed that the decomposed phase with higher concentration of SiO_2 contains smaller amount of titanium oxides than the other phase. Thermodynamic analysis was conducted to evaluate the distribution of titanium oxides in the glass phases, formed by a phase separation in the multicomponent borosilicate glass, where glass was regarded as a super-cooled liquid phase. In the thermodynamic analysis, the calculated activity of TiO_2 in the two decomposed glass phases indicated that the glass phase with higher concentration of SiO_2 contains lower concentration of titanium oxides. Porous glasses containing titanium oxide were fabricated from the spinodal-decomposed borosilicate glass by leaching one of the separated phases with an acid solution. Ti K-edge X-ray absorption near edge structure spectra indicated that the porous glass contains tetrahedrally coordinated titanium oxides.
Publisher
日本鉄鋼協会
The Iron and Steel Institute of Japan
ニホン　テッコウ　キョウカイ
Source Title
ISIJ International
Volume (Issue)
50(4)
Page
509-514
Date of Issued
2010
Language
English
Handle URL
https://hdl.handle.net/11094/26382
PISSN
09151559
NCID
AA10680712
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.2355/isijinternational.50.509
Access Rights
open access
CopyRight
© 2010 ISIJ
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Version of Record
Category
学術雑誌論文 Journal Article