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Study Reveals Superionic Carbon's Impact on Earth's Core Dynamics

12/3/2025

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Summary

Story summary

The study finds interstitial carbon in iron-carbon alloys becomes superionic under the inner core's extreme pressure and temperature.
In this state, carbon atoms move freely through a rigid iron lattice, reducing stiffness and slowing seismic shear waves.
The work, led by Prof. Youjun Zhang and Dr. Yuqian Huang, was published in National Science Review.
The findings shift understanding of Earth's core dynamics and may influence theories about other rocky planets.

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Story summary

The study finds interstitial carbon in iron-carbon alloys becomes superionic under the inner core's extreme pressure and temperature.
In this state, carbon atoms move freely through a rigid iron lattice, reducing stiffness and slowing seismic shear waves.
The work, led by Prof. Youjun Zhang and Dr. Yuqian Huang, was published in National Science Review.
The findings shift understanding of Earth's core dynamics and may influence theories about other rocky planets.