Experimental verification of the Stokes-Einstein relation in liquid Fe—FeS at 5 GPa
Experimental verification of the Stokes-Einstein relation in liquid Fe—FeS at 5 GPa
复制标题
5 GPa 下液态 Fe-FeS 中斯托克斯-爱因斯坦关系的实验验证
DOI：
10.1080/00268970010015858
复制
发表时间：
2001
影响因子：
1.7
通讯作者：
W. Crichton
中科院分区：
文献类型：
--
作者：
D. Dobson;J. Brodholt;L. Vočadlo;W. Crichton
为了测定Fe和S的自扩散系数随温度的变化，在5 Gpa的Fe-FeS液体上进行了实验。然后利用斯托克斯-爱因斯坦关系式得到了样品的粘度。实验结果与前人在相似条件下直接测量相同组成的材料的粘度的实验结果非常一致。与以前的一些研究相比，这些结果支持高的、近金属的扩散系数和低粘度的值，直到共晶温度以上的几百K的Fe-S液体。此外，这些结果充分证实了Fe0.61S0.39的粘性系数和扩散系数之间的Stokes-Einstein关系的正确性。
Experiments have been performed at 5 GPa on liquid Fe-FeS in order to determine Fe and S self-diffusivity as a function of temperature. The viscosity of the sample was then obtained using the Stokes-Einstein relation. The results are in excellent agreement with previous experiments where the viscosity of a material of the same composition under similar conditions was measured directly. These results support high, near-metallic, values of diffusivity and low viscosity in liquid Fe-S up to a few hundred K above the eutectic temperature, in contrast with some previous studies. Moreover, these results fully confirm the validity of the Stokes-Einstein relation between viscosity and diffusion coefficients for Fe0.61S0.39.