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

Suzuki, Masanori; Tanaka, Toshihiro

doi:https://doi.org/10.2355/isijinternational.50.509

アクセス数:221件（2024-09-22 19:05 集計）

固定URL: https://hdl.handle.net/11094/26382

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タイトル	Distribution and Coordination State of Titanium Oxides in Microstructures Formed by Spinodal Decomposition in Multicomponent Borosilicate Glass
著者	NRID 1000020610728 1000020610728 ORCID 0000-0003-1601-2842 0000-0003-1601-2842 researchmap permalink eternalblue eternalblue Scopus Author ID 56297002300 56297002300 著者名 Suzuki, Masanori
著者	NRID 1000010179773 1000010179773 researchmap permalink read0013978 read0013978 著者名 Tanaka, Toshihiro
キーワード等	tetrahedrally coordinated titanium oxide
	phase separation
	porous glass
	Gibbs energy
	super-cooled liquid phase
抄録	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.
出版者	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
収録物名	ISIJ International
巻(号)	50(4)
ページ	509-514
刊行年月	2010
言語	英語
ハンドルURL	https://hdl.handle.net/11094/26382
PISSN	09151559
NCID	AA10680712
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.2355/isijinternational.50.509
アクセス権	open access
権利情報	© 2010 ISIJ
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	ISIJ International. 2010, 50(4), p. 509-514
DC.title	Distribution and Coordination State of Titanium Oxides in Microstructures Formed by Spinodal Decomposition in Multicomponent Borosilicate Glass
DC.creator	Suzuki, Masanori
DC.creator	Tanaka, Toshihiro
DC.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
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2010
DC.identifier	https://doi.org/10.2355/isijinternational.50.509
DC.subject	tetrahedrally coordinated titanium oxide
	phase separation
	porous glass
	Gibbs energy
	super-cooled liquid phase
DCTERMS.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.
DC.rights	© 2010 ISIJ
DC.format	26382
citation_title	Distribution and Coordination State of Titanium Oxides in Microstructures Formed by Spinodal Decomposition in Multicomponent Borosilicate Glass
citation_author	Suzuki, Masanori
citation_author	Tanaka, Toshihiro
citation_publisher	日本鉄鋼協会
citation_language	英語
citation_date	2010
citation_journal_title	ISIJ International
citation_volume	50
citation_issue	4
citation_firstpage	509
citation_lastpage	514
citation_doi	https://doi.org/10.2355/isijinternational.50.509
citation_public_url	https://hdl.handle.net/11094/26382

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