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- W2019018115 abstract "The glassy phases of SiO 2 , GeO 2 , B 2 O 3 , and P 2 O 5 as well as selected pseudo-binary, pseudo-ternary, and pseudo-quaternary compositions of these compounds have been examined for glass transitions by differential thermal analysis (DTA) in the context of reflow of doped germanosilicate glasses. SiO 2 does not exhibit a glass transition to temperatures above I 135°C. GeO 2 appears to exhibit a glass transition around 578°C, while B 2 O 3 appears to exhibit a glass transition in the range of 257-268°C. Although the glass transition temperature of P 2 O 5 could not be determined, the transition and melting behavior of the H, O, and O' phases have been reevaluated. Moreover, a new mechanism for conversion from H phase to O phase is presented. Namely, the melting of H H phase followed by the spontaneous recrystallization of the resulting liquid to form the O phase was observed by DTA. Germanosilicate mixtures exhibited no glass transition, but the germanoborates' glass transition temperatures increased linearly with increasing GeO 2 content. Examination of germanoborosilicates indicated that the addition of any germanosilicate composition to B 2 O 3 causes a linear increase in glass transition temperature with total germanosilicate mole fraction, independent of the GeO 2 /SiO 2 mole ratio. Pseudo-binary combinations of P 2 O 5 -B 2 O 3 showed no thermal anomalies on heating or cooling cycles following an initial thermal cycle. However, pseudo-binary combinations of P 2 O 5 -GeO exhibited exotherms on cooling following initial heating cycles, which may indicate the occurrence of crystallizations that might interfere with reflow phenomena Pseudo-quaternary combinations exhibited no thermal anomalies on heating or cooling." @default.
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- W2019018115 date "1999-12-01" @default.
- W2019018115 modified "2023-09-25" @default.
- W2019018115 title "Differential Thermal Analysis of Glass Mixtures Containing SiO2, GeO2, B 2 O 3, and P 2 O 5" @default.
- W2019018115 doi "https://doi.org/10.1149/1.1392676" @default.
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