Terrestrial‐type planetary cores are thought to be predominantly composed of Fe with varying amounts of lighter chemical species or impurities chosen from a narrow range of possible elements, which includes S. These impurity elements may contribute significant effects to the transport properties of these cores, which have direct influence over dynamo and thermal evolution of the planetary body. Recent experimental methods have partially eased the substantial challenges that arise in direct measurements of electrical transport properties at high pressures and temperatures. In this study we show how this methodology can be used to measure the electrical resistivity of a sample in powder form. The electrical resistivity of FeS was measured in both solid and molten states at pressures up to 5 GPa and the thermal conductivity was calculated using the Wiedemann–Franz Law from the electrical measurements. The results showed FeS is notably more electrically and thermally conductive when compared to previous studies in both the solid and molten states. The results were used to estimate the adiabatic conductive heat flow of a molten FeS core model of Ganymede, which showed that thermal convection is permissible as a dynamo power source.

中文翻译：

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FeS在高温高压下的电阻率：木卫三核心中热传递的含义

人们认为，地球型行星芯主要由铁组成，具有少量的轻化学物质或杂质，这些化学物或杂质的选择范围很广，其中可能包括S。这些杂质元素可能会对这些核的传输特性产生重大影响，它们直接影响着行星的发电机和热演化。最近的实验方法已部分缓解了在高压和高温下直接测量电传输性能所产生的重大挑战。在这项研究中，我们展示了如何使用这种方法来测量粉末状样品的电阻率。FeS的电阻率是在高达5 GPa的压力下在固态和熔融状态下测量的，热导率是根据Wiedemann-Franz定律从电学测量值计算得出的。结果表明，与先前的固态和熔融态研究相比，FeS的导电性和导热性均显着提高。结果被用来估计木卫三熔融FeS核心模型的绝热传导热流，这表明热对流可以作为发电机的动力源。