Scientists Find Strange Matter at Earth's Center

Earth's inner core, predominantly composed of iron with trace amounts of light elements, exhibits remarkable behavior under extreme conditions. Research conducted at Science Tokyo has revealed that this iron-rich environment may transition into a superionic state at pressures and temperatures characteristic of the core-mantle boundary. This finding challenges conventional understanding of deep-Earth geophysics and necessitates a reassessment of established mineralogical models.

The experimental approach employed diamond-anvil cells equipped with laser heating capabilities and electrical conductivity measurements. These sophisticated instruments reproduced the immense pressures and temperatures found approximately 5,000 kilometers beneath Earth's surface. Through careful analysis of the iron hydride samples, the researchers identified definitive signatures of superionic behavior, where hydrogen ions become mobile within a solid iron lattice, creating a partially fluid-like state within an otherwise crystalline structure.

The implications of this discovery extend to core dynamics and the generation of Earth's magnetic field. Understanding the superionic state of iron hydride may elucidate previously unexplained seismic observations and thermal evolution of the planet's interior. These findings underscore the complexity of deep-Earth chemistry and highlight the importance of experimental mineral physics in advancing our comprehension of planetary formation and internal processes.

Sources: phys.org