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New measurement of melting and thermal conductivity of iron close to outer core conditions
Geoscience Frontiers ( IF 8.9 ) Pub Date : 2019-07-04 , DOI: 10.1016/j.gsf.2019.06.007
Abhisek Basu , Matthew R. Field , Dougal G. McCulloch , Reinhard Boehler

The amount of literature on both melting and thermal conductivity of iron at Earth’s core conditions is overwhelming and the discrepancies are very large. There is a broad range of experimental techniques each of which is flawed to a certain degree, which may explain the discrepancy. In this report, we present new data using a different method for determining the phase behavior and resistivity of iron in the laser-heated diamond cell by measuring the electrical resistance of both solid and liquid iron wires. The experiment avoids some of the major flaws of previous experiments, the most important of which is the detection of the onset of melting. These measurements confirm a shallow melting curve found earlier and the resistivity data imply a trend towards low thermal conductivity in the liquid outer core.



中文翻译:

接近铁心条件的铁的熔化和热导率的新测量

关于地球核心条件下铁的熔化和热导率的文献数量不胜枚举,差异非常大。有各种各样的实验技术,每种技术都有一定程度的缺陷,这可以解释这一差异。在本报告中,我们通过使用不同的方法,通过测量实心和液态铁丝的电阻,来确定激光加热金刚石电池中铁的相行为和电阻率,从而提供了新的数据。该实验避免了先前实验的一些主要缺陷,其中最重要的是检测熔化的开始。这些测量结果证实了较早发现的较浅的熔融曲线,并且电阻率数据暗示了液体外芯中的低导热率趋势。

更新日期:2019-07-04
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