Thermal properties and glass formation in the SiO2-B 2O3-Bi2O3-ZnO quaternary system

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Abstract

Lead-free glasses in the SiO2-B2O3-Bi 2O3-ZnO quaternary system were studied. The glass formation region, as determined by XRD patterns of bulk samples, was limited to glasses having more than 40 mol% of the glass-forming oxides SiO2 and B2O3. Crystalline phases of Zn2SiO4 (willemite) were detected in compositions of 30SiO2 • 10B 2O3 • 20Bi2O3 • 40ZnO and 20SiO2 • 10B2O3 • 25Bi 2O3 • 45ZnO. Glass transition temperatures (T g), dilatometric softening points (Td) and linear coefficients of expansion in the temperatures range of 25-300 °C (α25-300) were measured for subsystems along the B 2O3 join of 10, 20 and 30 mol%. For these subsystems, Tg ranged from 411 to 522 °C, and Td ranged from 453 to 563 °C, both decreasing with increasing Bi2O3 content. The measured α25-300 ranged from 53 to 95 × 10-7 °C-1, with values increasing with increasing Bi2O3 content. The ZnO content had the opposite effect to the Bi2O3 content. It appears that Bi3+ acts as a glass-modifier in this quaternary system.

Original languageEnglish
Pages (from-to)3503-3507
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume351
Issue number43-45
DOIs
StatePublished - 1 Nov 2005

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