{
  "id": 2427335,
  "title": "Iron hydride enters an exotic state of matter under Earth's inner-core conditions",
  "url": "https://urgent.news/2026/08/21/iron-hydride-enters-an-exotic-state-of-matter-under-earths-inner-core",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-21T20:00:04.000Z",
  "source": {
    "name": "Phys.org",
    "slug": "phys-org",
    "url": "https://phys.org/news/2026-08-iron-hydride-exotic-state-earth.html"
  },
  "original_language": "en",
  "account": "Earth's inner core, primarily composed of iron with a small amount of light elements, may transform into a superionic state under extreme pressure and temperature, according to research from Science Tokyo. Utilizing laser-heated and electrically wired diamond-anvil cells, the team identified experimental signatures of this unusual state of matter. This discovery provides new insights into the composition and dynamics of Earth's deep interior. In the superionic phase, iron atoms remain stationary while lighter elements like hydrogen, oxygen, and carbon move almost as if they were liquid. This movement contributes to the slower travel of seismic shear waves through Earth's inner core. The study, led by Yoshihiro Nagaya, Yusuke Okazaki, and Kenji Ohta, revealed that face-centered cubic (fcc) iron hydride (FeHX) enters a superionic state under Earth's inner core conditions. Time-resolved synchrotron X-ray diffraction measurements showed a λ-shaped anomaly in the material's thermal expansion coefficient near 1,590 Kelvin, indicating a phase transition. Extrapolating this transition to Earth's inner core pressure suggests that FeHX could exist in a superionic state, even though its hydrogen diffusion would be extremely slow under such conditions.",
  "summary": "Earth's inner core, composed primarily of iron with a small percentage of light elements, may enter a superionic state at extreme pressure and temperature, according to experimental results from researchers at Science Tokyo. Using laser-heated and electrically wired diamond-anvil cells, the researchers identified experimental signatures of superionic iron hydride at conditions relevant to Earth's…",
  "key_points": [
    "Iron hydride FeHX enters superionic state at Earth's inner core conditions",
    "Light elements move like liquid while iron atoms stay stationary",
    "λ-shaped anomaly in thermal expansion indicates phase transition"
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}