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The effect of nitrogen on the compressibility and conductivity of iron at high pressure

Zhuang, Yukai; Su, Xiaowan; Salke, Nilesh P; Cui, Zhongxun; Hu, Qingyang; Zhang, Dongzhou; Liu, Jin; (2021) The effect of nitrogen on the compressibility and conductivity of iron at high pressure. Geoscience Frontiers , 12 (2) pp. 983-989. 10.1016/j.gsf.2020.04.012. Green open access

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Abstract

Although nitrogen in the Earth’s interior has attracted significant attention recently, it remains the most enigmatic of the light elements in the Earth’s core. In this work, synchrotron X-ray diffraction (XRD) and electrical conductivity experiments were conducted on iron nitrides (Fe2N and Fe4N) in diamond anvil cells (DACs) up to about 70 ​GPa ​at ambient temperature. These results show that iron nitrides are stable up to at least 70 ​GPa. From the equation of state (EOS) parameters, iron nitrides are more compressible than iron carbides. Moreover, using the van der Pauw method and Wiedemann-Franz law, the electrical and thermal conductivity of samples were determined to be much lower than that of iron carbides. The conductivities of Fe2N and Fe4N were similar at 20–70 ​GPa, suggesting no evident effects by varying the N stoichiometries in iron nitrides. Iron nitrides are less dense and conductive but more compressible than carbides at 0–70 ​GPa. This study indicates that less nitrogen than carbon can explain geophysical phenomena in the deep Earth, such as the density deficit.

Type: Article
Title: The effect of nitrogen on the compressibility and conductivity of iron at high pressure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.gsf.2020.04.012
Publisher version: https://doi.org/10.1016/j.gsf.2020.04.012
Language: English
Additional information: © 2020 China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: Science & Technology, Physical Sciences, Geosciences, Multidisciplinary, Geology, High pressure, Iron nitrides, Synchrotron X-ray diffraction, Electrical conductivity, X-RAY-DIFFRACTION, EQUATION-OF-STATE, EARTHS CORE, ELECTRICAL-RESISTIVITY, THERMAL-CONDUCTIVITY, CARBON, MANTLE, GPA, FE, NITRIDES
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10163307
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