Viscosity change and structural transition of Molten Fe at 5 GPa
Viscosity change and structural transition of Molten Fe at 5 GPa
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DOI：
10.1029/2001gl014321
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发表时间：
2002-04
影响因子：
5.2
通讯作者：
H. Terasaki;Takumi Kato;S. Urakawa;K. Funakoshi;K. Sato;A. Suzuki;T. Okada
中科院分区：
文献类型：
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作者：
H. Terasaki;Takumi Kato;S. Urakawa;K. Funakoshi;K. Sato;A. Suzuki;T. Okada
通过落球X射线照相法对高压下纯熔融铁的原位粘度进行了测量。在2000 K左右，粘度系数在2.7-5.0 GPa范围内为15-24 mPa·s，在5.0-7.0 GPa范围内为4-9 mPa·s。急剧下降，发现在5 GPa左右，在该稳定的固相低于熔化温度的变化，从三角洲（bcc）到γ（fcc）相。实验结果表明，在与固态相变相似的条件下，Fe熔体中的结构变化可能发生在一个狭窄的压力区间（1GPa）内。
The in situ viscosity measurements of the pure molten Fe under high pressures were made by falling sphere X‐ray radiography method. Viscosity coefficients at about 2000 K were 15–24 mPa s at 2.7–5.0 GPa, and 4–9 mPa s at 5.0–7.0 GPa. Drastic decrease was found at around 5 GPa, at which stable solid phase below the melting temperatures change from delta (bcc) to gamma (fcc) phases. The observation indicates the possibility that the structural change in the molten Fe occurs in a narrow pressure interval (1 GPa) at the similar condition with the phase transformation in the solid.