Jan, 2011
Pressure and temperature dependence of the viscosity of a NaAlSi2O6 melt
PHYSICS AND CHEMISTRY OF MINERALS
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- Volume
- 38
- Number
- 1
- First page
- 59
- Last page
- 64
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1007/s00269-010-0381-4
- Publisher
- SPRINGER
The viscosity of a silicate melt of composition NaAlSi2O6 was measured at pressures from 1.6 to 5.5 GPa and at temperatures from 1,350 to 1,880 degrees C. We employed in situ falling sphere viscometry using X-ray radiography. We found that the viscosity of the NaAlSi2O6 melt decreased with increasing pressure up to 2 GPa. The pressure dependence of viscosity is diminished above 2 GPa. By using the relationship between the logarithm of viscosity and the reciprocal temperature, the activation energies for viscous flow were calculated to be 3.7 +/- 0.4 x 10(2) and 3.7 +/- 0.5 x 10(2) kJ/mol at 2.2 and 2.9 GPa, respectively.
- Link information
- ID information
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- DOI : 10.1007/s00269-010-0381-4
- ISSN : 0342-1791
- Web of Science ID : WOS:000286348600006