Sintering and crystallization of off-stoichiometric BaO·Al2O3·2SiO2 glasses

Yun Mo Sung, Jae Woo Ahn

Research output: Contribution to journalArticle

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Abstract

Glass-ceramics with off-stoichiometric celsian composition of 50 wt% BaO·2SiO2-50 wt% BaO·Al2O3·2SiO2, (B2S-BA2S) were fabricated and investigated for their sintering and crystallization characteristics. (B2S-BA2S) glass powder showed a melting temperature much lowered compared to that of stoichiometric BaO·Al2O3·2SiO2 (BA2S) glass powder and high sintering ability. (B2S-BA2S) glass powder containing B2O3, (B2S-BA2S)B and that containing B2O3 and TiO2, (B2S-BA2S)BT revealed much lowered crystallization peak temperatures, but rather low sintered density. By applying Kissiger analysis to differential thermal analysis (DTA) data activation energy values for crystallization were determined as 265, 195 and 242 kJ/mol, respectively for (B2S-BA2S), (B2S-BA2S)B and (B2S-BA2S)BT glasses. X-ray diffraction (XRD) patterns from all the glass-ceramics crystallized at 1100 °C for 4 h revealed formation of crystalline phases of β-BaO·2SiO2, monocelsian and hexacelsian. (B2S-BA2S) glass-ceramics crystallized at 1400 °C for 4 h showed formation of β-BaO·2SiO2 and monocelsian phases with only trace of metastable hexacelsian phase.

Original languageEnglish
Pages (from-to)4913-4918
Number of pages6
JournalJournal of Materials Science
Volume35
Issue number19
DOIs
Publication statusPublished - 2000 Oct 1
Externally publishedYes

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Crystallization
Glass ceramics
Sintering
Powders
Glass
Metastable phases
Differential thermal analysis
Diffraction patterns
Melting point
Activation energy
Crystalline materials
X ray diffraction
Chemical analysis
Temperature
boron oxide

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Sintering and crystallization of off-stoichiometric BaO·Al2O3·2SiO2 glasses. / Sung, Yun Mo; Ahn, Jae Woo.

In: Journal of Materials Science, Vol. 35, No. 19, 01.10.2000, p. 4913-4918.

Research output: Contribution to journalArticle

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