Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 380-387 |
| Seitenumfang | 8 |
| Fachzeitschrift | Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B |
| Jahrgang | 48 |
| Ausgabenummer | 6 |
| Publikationsstatus | Veröffentlicht - Dez. 2007 |
Abstract
The viscosity of silica glasses with different water contents was measured by penetration of sapphire microspheres in the range from 1012- 1014.7 Pas at ambient pressure. Commercial silica glasses were used together with hydrous silica glasses, which were prepared by melting glass powder plus water in an internally heated pressure vessel at 2-3 kbar and 1350-1450°C. The temperature dependence of the viscosity of silica glasses with total water contents Cw, of 5.4×10-4, 7.0×10-4, 1.00×10-2, and 1.55×10 -2 (Cw, in mass fractions) can be described by Arrhenius equations. From the results, the linear dependence of the T12 isokom (K) with the logarithm of the water content was determined as T 12=192-409 logCw. The analysis of the compositional dependence of the T12 isokom in the H2O-Na 2O-SiO2 system reveals a temperature depression of up to 200 K for mixed water- and sodium-bearing glasses compared to H 2O-SiO2 and Na2O-SiO2 glasses with same molar silica content. From these findings we conclude that protons may contribute significantly to the mixed alkali effect in glasses.
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- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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in: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B, Jahrgang 48, Nr. 6, 12.2007, S. 380-387.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Glass transition and viscosity of hydrated silica glasses
AU - Zietka, S.
AU - Deubener, J.
AU - Behrens, H.
AU - Müller, R.
PY - 2007/12
Y1 - 2007/12
N2 - The viscosity of silica glasses with different water contents was measured by penetration of sapphire microspheres in the range from 1012- 1014.7 Pas at ambient pressure. Commercial silica glasses were used together with hydrous silica glasses, which were prepared by melting glass powder plus water in an internally heated pressure vessel at 2-3 kbar and 1350-1450°C. The temperature dependence of the viscosity of silica glasses with total water contents Cw, of 5.4×10-4, 7.0×10-4, 1.00×10-2, and 1.55×10 -2 (Cw, in mass fractions) can be described by Arrhenius equations. From the results, the linear dependence of the T12 isokom (K) with the logarithm of the water content was determined as T 12=192-409 logCw. The analysis of the compositional dependence of the T12 isokom in the H2O-Na 2O-SiO2 system reveals a temperature depression of up to 200 K for mixed water- and sodium-bearing glasses compared to H 2O-SiO2 and Na2O-SiO2 glasses with same molar silica content. From these findings we conclude that protons may contribute significantly to the mixed alkali effect in glasses.
AB - The viscosity of silica glasses with different water contents was measured by penetration of sapphire microspheres in the range from 1012- 1014.7 Pas at ambient pressure. Commercial silica glasses were used together with hydrous silica glasses, which were prepared by melting glass powder plus water in an internally heated pressure vessel at 2-3 kbar and 1350-1450°C. The temperature dependence of the viscosity of silica glasses with total water contents Cw, of 5.4×10-4, 7.0×10-4, 1.00×10-2, and 1.55×10 -2 (Cw, in mass fractions) can be described by Arrhenius equations. From the results, the linear dependence of the T12 isokom (K) with the logarithm of the water content was determined as T 12=192-409 logCw. The analysis of the compositional dependence of the T12 isokom in the H2O-Na 2O-SiO2 system reveals a temperature depression of up to 200 K for mixed water- and sodium-bearing glasses compared to H 2O-SiO2 and Na2O-SiO2 glasses with same molar silica content. From these findings we conclude that protons may contribute significantly to the mixed alkali effect in glasses.
UR - http://www.scopus.com/inward/record.url?scp=38949175705&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:38949175705
VL - 48
SP - 380
EP - 387
JO - Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B
JF - Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B
SN - 0031-9090
IS - 6
ER -