High-temperature electrical resistivity measurements of hcp iron to Mbar pressure in an internally resistive heated diamond anvil cell
High-temperature electrical resistivity measurements of hcp iron to Mbar pressure in an internally resistive heated diamond anvil cell
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DOI：
10.1080/08957959.2019.1692008
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发表时间：
2019-10
影响因子：
2
通讯作者：
S. Suehiro;Tatsuya Wakamatsu;K. Ohta;K. Hirose;Y. Ohishi
中科院分区：
文献类型：
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作者：
S. Suehiro;Tatsuya Wakamatsu;K. Ohta;K. Hirose;Y. Ohishi
摘要 铁的电和热传输特性对于理解地核的热演化和动力学非常重要，铁是地核的主要组成部分。然而，报告的核心条件下铁的电导率值仍然存在很大争议。在这项研究中，我们采用了内部电阻加热金刚石砧室 (IHDAC) 技术，可降低加热样品内部的温度不均匀性，并重新审视了高达 110 GPa 和 2500 K 的六方密堆积 (hcp) 铁的电阻率。我们的结果与使用激光加热金刚石砧室技术获得的 hcp 铁的高压-温度电阻率的报告值完全一致，支持地核的高铁电导率条件。这里采用的 IHDAC 中的高压-温度电阻率测量将是一种更适合在地球核心条件下检查电阻率更高的铁合金的方法。
ABSTRACT Electrical and thermal transport properties of iron are of great importance for understanding the thermal evolution and dynamics of the Earth’s core, of which iron is a major component. However, the reported values of iron’s conductivity at core conditions are still highly controversial. In this study, we employed an internally resistive heated diamond anvil cell (IHDAC) technique that reduces temperature heterogeneity inside the heated sample, and revisited the electrical resistivity of hexagonal closed packed (hcp) iron up to 110 GPa and 2500 K. Our results are in complete agreement with the reported values of the high pressure-temperature electrical resistivity of hcp iron obtained by using the laser-heated diamond anvil cell technique, supporting high iron conductivity at the Earth’s core conditions. The high pressure-temperature resistivity measurement in an IHDAC employed here would be a more suitable method to examine more resistive iron alloys at the Earth’s core conditions.