Details
| Original language | English |
|---|---|
| Article number | 044504 |
| Journal | Journal of Chemical Physics |
| Volume | 131 |
| Issue number | 4 |
| Publication status | Published - 2009 |
Abstract
The effect of pressure on melt viscosity was investigated for five compositions along the join An (CaAl2 Si2 O8) -Di (CaMgSi2 O6) and four alkali silicates containing lithium, sodium, and potassium in constant ratio of ∼1:1:1, but alkali-silica ratios are varying. The experiments were performed in an internally heated gas pressure vessel at pressures from 50 to 400 MPa in the viscosity range from 108 to 1011.5 Pas using parallel plate viscometry. The polymerized An composition shows a negative pressure dependence of viscosity while the other, more depolymerized compositions of the join An-Di have neutral to positive pressure coefficients. The alkali silicates display neutral to slightly positive pressure coefficients for melt viscosity. These findings in the high viscosity range of 108 - 1011 Pas, where pressure appears to be more efficient than in low viscous melts at high temperature, are consistent with previous results on the viscosity of polymerized to depolymerized melts in the system NaAlSi3 O8 - CaMgSi2 O6 by Behrens and Schulze [H. Behrens and F. Schulze, Am. Mineral. 88, 1351 (2003)]. Thus we confirm that the sign of the pressure coefficient for viscosity is mainly related to the degree of melt polymerization in silicate and aluminosilicate melts.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of Chemical Physics, Vol. 131, No. 4, 044504, 2009.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - An experimental study on the pressure dependence of viscosity in silicate melts
AU - Del Gaudio, Piero
AU - Behrens, Harald
N1 - Funding Information: This research was supported by the German Science Foundation (DFG Grant No. BE1720/9). The authors thank two anonymous reviewers for constructive comments, P. Richet and D. Neuville for technical support in their laboratory, H. Hui for constructive discussion and O. Diedrich for samples preparation.
PY - 2009
Y1 - 2009
N2 - The effect of pressure on melt viscosity was investigated for five compositions along the join An (CaAl2 Si2 O8) -Di (CaMgSi2 O6) and four alkali silicates containing lithium, sodium, and potassium in constant ratio of ∼1:1:1, but alkali-silica ratios are varying. The experiments were performed in an internally heated gas pressure vessel at pressures from 50 to 400 MPa in the viscosity range from 108 to 1011.5 Pas using parallel plate viscometry. The polymerized An composition shows a negative pressure dependence of viscosity while the other, more depolymerized compositions of the join An-Di have neutral to positive pressure coefficients. The alkali silicates display neutral to slightly positive pressure coefficients for melt viscosity. These findings in the high viscosity range of 108 - 1011 Pas, where pressure appears to be more efficient than in low viscous melts at high temperature, are consistent with previous results on the viscosity of polymerized to depolymerized melts in the system NaAlSi3 O8 - CaMgSi2 O6 by Behrens and Schulze [H. Behrens and F. Schulze, Am. Mineral. 88, 1351 (2003)]. Thus we confirm that the sign of the pressure coefficient for viscosity is mainly related to the degree of melt polymerization in silicate and aluminosilicate melts.
AB - The effect of pressure on melt viscosity was investigated for five compositions along the join An (CaAl2 Si2 O8) -Di (CaMgSi2 O6) and four alkali silicates containing lithium, sodium, and potassium in constant ratio of ∼1:1:1, but alkali-silica ratios are varying. The experiments were performed in an internally heated gas pressure vessel at pressures from 50 to 400 MPa in the viscosity range from 108 to 1011.5 Pas using parallel plate viscometry. The polymerized An composition shows a negative pressure dependence of viscosity while the other, more depolymerized compositions of the join An-Di have neutral to positive pressure coefficients. The alkali silicates display neutral to slightly positive pressure coefficients for melt viscosity. These findings in the high viscosity range of 108 - 1011 Pas, where pressure appears to be more efficient than in low viscous melts at high temperature, are consistent with previous results on the viscosity of polymerized to depolymerized melts in the system NaAlSi3 O8 - CaMgSi2 O6 by Behrens and Schulze [H. Behrens and F. Schulze, Am. Mineral. 88, 1351 (2003)]. Thus we confirm that the sign of the pressure coefficient for viscosity is mainly related to the degree of melt polymerization in silicate and aluminosilicate melts.
UR - http://www.scopus.com/inward/record.url?scp=68249125829&partnerID=8YFLogxK
U2 - 10.1063/1.3169455
DO - 10.1063/1.3169455
M3 - Article
AN - SCOPUS:68249125829
VL - 131
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 4
M1 - 044504
ER -