The effect of impurities on the electrical resistivity of Fe at core conditions is controversial due to the challenges of measuring transport properties of Fe alloys under high‐pressure and high‐temperature conditions. In this study we describe an innovative technique to make wires of Fe‐Si samples initially in powder form for measuring electrical resistivity. The electrical resistivity of Fe‐2, Fe‐8.5, and Fe‐17 wt%Si was measured at 3, 4, and 5 GPa at temperatures into the liquid state and compared to results of Fe‐4.5 wt%Si and Fe from prior studies. Isothermal electrical resistivity increases linearly with increasing Si content. Yet the effect of Si content on the magnitude of the electrical resistivity compared to that of Fe diminished as temperature increased at all experimental pressures. This implies the contribution to the electrical resistivity due to Si impurities is dependent on temperature, in disagreement with Matthiessen's rule. Thermal conductivity of Fe‐Si alloys calculated using the Wiedemann‐Franz law indicates a nonnegligible influence of the Si content on the thermal conductive properties of Fe‐Si alloys. The results are used to calculate the adiabatic heat flux of an Fe‐Si lunar core and date the end of the high magnetic field intensity era of the lunar dynamo to be in the range 3.32–3.80 Ga.

中文翻译：

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Fe-Si的电阻率测量对早期的发电机具有影响

由于在高温和高温条件下测量铁合金的传输性能面临挑战，因此杂质在铁心条件下对铁的电阻率的影响引起争议。在这项研究中，我们描述了一种创新技术，该技术可以将最初以粉末形式制成的Fe-Si样品导线用于测量电阻率。在进入液态的温度下，分别在3、4和5 GPa下测量了Fe-2，Fe-8.5和Fe-17 wt％Si的电阻率，并将其与之前的Fe-4.5 wt％Si和Fe的结果进行了比较。学习。等温电阻率随着Si含量的增加而线性增加。然而，在所有实验压力下，随着温度的升高，Si含量对电阻率的影响要比Fe减小。这暗示了由于硅杂质而对电阻率的贡献取决于温度，这与马蒂森法则不同。使用Wiedemann-Franz定律计算的Fe-Si合金的热导率表明，Si含量对Fe-Si合金的导热性能的影响不可忽略。结果可用于计算Fe-Si月球核心的绝热热通量，并将月球发电机高磁场强度时代的结束日期定为3.32–3.80 Ga。