Pressure and temperature dependence of the viscosity of a NaAlSi_2O_6 melt
Pressure and temperature dependence of the viscosity of a NaAlSi_2O_6 melt
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NaAlSi_2O_6 熔体粘度的压力和温度依赖性
DOI：
10.1007/s00269-010-0381-4
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发表时间：
2011
影响因子：
1.4
通讯作者：
T.Kikegawa
中科院分区：
文献类型：
--
作者：
A.Suzuki;E.Ohtani;H.Terasaki;K.Nishida;H.Hayashi;T.Sakamaki;Y.Shibazaki;T.Kikegawa
在1.6至5.5 GPa的压力和1，350至1，880 ℃的温度下测量组成为NaAlSi 2 O 6的硅酸盐熔体的粘度。我们采用了现场落球粘度计使用X射线照相术。我们发现，NaAlSi 2 O 6熔体的粘度随着压力的增加而降低，直到2 GPa。粘度的压力依赖性在2GPa以上减小。利用粘度的对数与温度倒数的关系，计算出在2.2和2.9GPa下的粘流活化能分别为3.7 ± 0.4 × 102和3.7 ± 0.5 × 102 kJ/mol。
The viscosity of a silicate melt of composition NaAlSi2O6was 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 NaAlSi2O6melt 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 × 102and 3.7 ± 0.5 × 102kJ/mol at 2.2 and 2.9 GPa, respectively.