In situ viscosity measurements of liquid Fe–S alloys at high pressures
In situ viscosity measurements of liquid Fe–S alloys at high pressures
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高压下液态铁硫合金的原位粘度测量
DOI：
10.1080/08957951003616356
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发表时间：
2010
影响因子：
2
通讯作者：
K. Funakoshi
中科院分区：
文献类型：
--
作者：
K. Funakoshi
采用基于Stokes定律的落球粘度计和同步辐射成像技术测量了Fe73S27和Fe90S10合金的液态粘度，温度高达9.4 GPa，温度为2023 K。高速CCD相机（125帧/秒）可以在高于以往研究的压力和温度范围内确定下落球体的精确终端速度。压力对粘度的影响很小，而温度对粘度的影响很大。Fe73S27和Fe90S10的表观活化能相当接近，表明硫含量对液态铁合金的影响可以忽略不计。压力和硫含量对液态铁合金粘度的影响较小，表明铁是高压下粘性流动单元的主要成分。硫的加入可能不会对地球外核的粘性流动产生严重影响。
The viscosities of liquid Fe73S27 and Fe90S10 alloys were measured by combining a falling-sphere viscometer based on Stokes’ law with the technique of synchrotron radiography to up to 9.4 GPa and 2023 K. A high-speed CCD camera (125 frames/s) enabled the precise terminal velocity of the falling sphere to be determined over pressure and temperature ranges higher than those of previous studies. The effect of pressure on the viscosities was quite small, whereas temperature had a large effect. The apparent activation energies of Fe73S27 and Fe90S10 were quite similar, which indicates that the effect of sulfur content on liquid Fe alloys was negligible. The small effects associated with pressure and sulfur content on the viscosities of liquid Fe alloys show that iron is the dominant component of the viscous flow unit under high pressures. The addition of sulfur may not have a serious effect on the viscous flow of the Earth's outer core.