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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Electrical resistivity of solid and liquid Pt: Insight into electrical resistivity of epsilon-Fe
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Electrical resistivity of solid and liquid Pt: Insight into electrical resistivity of epsilon-Fe

机译：固体和液体PT的电阻率：EPSILON-FE电阻率的洞察力

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摘要

Knowledge of the transport properties of Fe and its alloys at extreme pressure (P) and temperature (T) conditions are essential for understanding the generation and sustainability of the magnetic field of the rocky planets with a metallic core. Since Pt, an unfilled d-band late transition metal with an electronic structure of Xe4f(14)5d(9)6s(1), is paramagnetic and close-packed structure at ambient and high P-T conditions, it is expected that its transport properties at these conditions would be similar to those of epsilon-Fe. We investigated the T-dependent electrical resistivity of solid and liquid Pt up to 8 GPa and found it constant along its melting curve on the liquid side in agreement with theoretical investigations and experimental results estimated from thermal conductivity measurements. Our results suggest that the T-dependent resistivity of epsilon-Fe could be linear and would not saturate at high P, T conditions. This, in turn, suggests that the thermal conductivity of liquid Fe at Earth's core conditions may not be as high as previously suggested by models employing saturation resistivity. Hence, thermal convection could have powered the geodynamo before the birth of the inner core. The electrical resistivity and thermal conductivity on the liquid and solid sides of the inner core boundary of the Earth could be different in values. (C) 2020 Elsevier B.V. All rights reserved.
机译：在极压（P）和温度（T）条件下对Fe及其合金的运输性质的知识对于了解具有金属芯的岩石行星磁场的产生和可持续性至关重要。由于PT，具有XE4F（14）5D（9）6S（1）的电子结构的未填充的D波段后过渡金属是环境温度和高PT条件下的顺磁性和近填充结构，预计其运输特性在这些条件下，与epsilon-fe的条件相似。我们研究了固体和液体PT的T型电阻率高达8GPa，并沿着液面上​​的熔化曲线达到了与来自导热率测量估计的理论研究和实验结果的熔化曲线恒定。我们的研究结果表明，Epsilon-Fe的T依赖性电阻率可以是线性的，并且不会在高p，T条件下饱和。反过来，这表明地球核心条件下的液体FE的导热率可能不如采用饱和电阻率的模型所提出的那样高。因此，热对流可以在内核诞生之前为Geodynamo提供动力。地球内芯边界的液体和固体侧上的电阻率和导热率可以不同于值。 （c）2020 Elsevier B.v.保留所有权利。

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