Pressure and temperature dependence of the viscosity of a NaAlSi2O6 melt

被引：0
作者：
Akio Suzuki
Eiji Ohtani
Hidenori Terasaki
Keisuke Nishida
Hiromi Hayashi
Tatsuya Sakamaki
Yuki Shibazaki
Takumi Kikegawa
机构：
[1] Tohoku University,Department of Earth and Planetary Materials Science, Graduate School of Science
[2] High Energy Accelerator Research Organization (KEK),Institute of Materials Structure Science (IMSS)
来源：
Physics and Chemistry of Minerals | 2011年 / 38卷
关键词：
Viscosity; Silicate melt; High pressure; Radiography;
D O I：
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学科分类号：
摘要：
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°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 × 102 and 3.7 ± 0.5 × 102 kJ/mol at 2.2 and 2.9 GPa, respectively.
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页码：59 / 64
页数：5
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