Kinetic and structural analyses for the formation of anatase nanocrystals in barium titanoborate glasses

Jong Youn Choi, Yun Mo Sung

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Abstract Transparent barium titanoborate glass-ceramics bearing TiO<inf>2</inf> (anantase) nanocrystals were prepared by the conventional melt-quenching and subsequent heat treatment of 35BaO-xTiO<inf>2</inf>-110B<inf>2</inf>O<inf>3</inf> (in mol) (x = 20, 25, and 30) glasses. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) results clearly reveal the formation of highly-crystalline anatase nanocrystals in glass matrices. The average crystal size ranges from ∼10 to 20 nm according to TiO<inf>2</inf> contents. Non-isothermal kinetic analyses were performed to understand the crystallization behavior of each glass using differential scanning calorimetry (DSC) scan curves. With the increase of TiO<inf>2</inf> contents in the glass, the crystallization peak temperature of TiO<inf>2</inf> decreases, while the activation energy for crystallization increases. We propose a possible mechanism for the formation of TiO<inf>2</inf> nanocrystals based upon kinetic analysis results and structural changes in barium titanoborate glass matrices according to TiO<inf>2</inf> contents. The nanocrystalline glass-ceramics show ∼60-75% visible light transmittance and sharp UV-light absorption edges at ∼387 nm, corresponding to the energy band gap of anatase (3.2 eV). They show apparent photocatalytic properties and ∼70% of methylene blue solution was decomposed within 180 min.

Original languageEnglish
Article number34621
Pages (from-to)1022-1027
Number of pages6
JournalJournal of Alloys and Compounds
Volume647
DOIs
Publication statusPublished - 2015 Jul 8

Fingerprint

Barium
Titanium dioxide
Nanocrystals
Crystallization
Glass
Kinetics
Glass ceramics
Bearings (structural)
Methylene Blue
High resolution transmission electron microscopy
Ultraviolet radiation
Band structure
Differential scanning calorimetry
Quenching
Energy gap
Activation energy
Heat treatment
Crystalline materials
X ray diffraction
Crystals

Keywords

  • Anatase
  • Glass-ceramic
  • Nanocrystals
  • Non-isothermal kinetics
  • Photocatalytic effect

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Kinetic and structural analyses for the formation of anatase nanocrystals in barium titanoborate glasses. / Choi, Jong Youn; Sung, Yun Mo.

In: Journal of Alloys and Compounds, Vol. 647, 34621, 08.07.2015, p. 1022-1027.

Research output: Contribution to journalArticle

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N2 - Abstract Transparent barium titanoborate glass-ceramics bearing TiO2 (anantase) nanocrystals were prepared by the conventional melt-quenching and subsequent heat treatment of 35BaO-xTiO2-110B2O3 (in mol) (x = 20, 25, and 30) glasses. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) results clearly reveal the formation of highly-crystalline anatase nanocrystals in glass matrices. The average crystal size ranges from ∼10 to 20 nm according to TiO2 contents. Non-isothermal kinetic analyses were performed to understand the crystallization behavior of each glass using differential scanning calorimetry (DSC) scan curves. With the increase of TiO2 contents in the glass, the crystallization peak temperature of TiO2 decreases, while the activation energy for crystallization increases. We propose a possible mechanism for the formation of TiO2 nanocrystals based upon kinetic analysis results and structural changes in barium titanoborate glass matrices according to TiO2 contents. The nanocrystalline glass-ceramics show ∼60-75% visible light transmittance and sharp UV-light absorption edges at ∼387 nm, corresponding to the energy band gap of anatase (3.2 eV). They show apparent photocatalytic properties and ∼70% of methylene blue solution was decomposed within 180 min.

AB - Abstract Transparent barium titanoborate glass-ceramics bearing TiO2 (anantase) nanocrystals were prepared by the conventional melt-quenching and subsequent heat treatment of 35BaO-xTiO2-110B2O3 (in mol) (x = 20, 25, and 30) glasses. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) results clearly reveal the formation of highly-crystalline anatase nanocrystals in glass matrices. The average crystal size ranges from ∼10 to 20 nm according to TiO2 contents. Non-isothermal kinetic analyses were performed to understand the crystallization behavior of each glass using differential scanning calorimetry (DSC) scan curves. With the increase of TiO2 contents in the glass, the crystallization peak temperature of TiO2 decreases, while the activation energy for crystallization increases. We propose a possible mechanism for the formation of TiO2 nanocrystals based upon kinetic analysis results and structural changes in barium titanoborate glass matrices according to TiO2 contents. The nanocrystalline glass-ceramics show ∼60-75% visible light transmittance and sharp UV-light absorption edges at ∼387 nm, corresponding to the energy band gap of anatase (3.2 eV). They show apparent photocatalytic properties and ∼70% of methylene blue solution was decomposed within 180 min.

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