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Scientists Create a New Form of Ice at More Than 2,000 °C : ScienceAlert (opens in a new tab)

sciencealert.com · 2026-09-09

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Claim 1 of 5Not checkedScientists have now demonstrated one of the weirdest forms of ice yet under pressures up to 2.3 million atmospheres and temperatures up to 2,630 kelvins.View evidenceHide evidence

As statedup to 2.3 million atmospheres; up to 2,630 kelvins

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Claim 2 of 5Not checkedA team led by physicist Alexis Forestier of the French Alternative Energies and Atomic Energy Commission subjected tiny samples of water to extreme conditions expected in the interiors of ice giant planets.View evidenceHide evidence

As statedpressures as high as 230 gigapascals; temperatures to thousands of degrees

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Claim 3 of 5Not checkedThe researchers found what the article describes as a previously predicted but never unambiguously observed configuration: hexagonal close-packed (hcp) ice, and the hcp crystal showed a signature of superionic behavior as it was heated.View evidenceHide evidence

As statedsuperionic behavior at around 1,700 kelvins

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Claim 4 of 5Not checkedThe article says the evidence suggests that one superionic form can transform into another, and that hcp may become the more stable arrangement above around 200 gigapascals.View evidenceHide evidence

As statedabove around 200 gigapascals

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Claim 5 of 5Not checkedThe story says this could affect models of electrical and material transport inside Uranus and Neptune, and thereby change ideas about how the planets generate their unusual magnetic fields.View evidenceHide evidence

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Observation of hexagonal close-packed water ice at conditions in ice giant planetary interiors

Physical Review Letters · 2026

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Papers considered

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Crossref, PubMed, Europe PMC · 16 candidate papers

Selected

Observation of hexagonal close-packed water ice at conditions in ice giant planetary interiors

Physical Review Letters · 2026 · Crossref

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Candidate

CO Dissociation on Face-Centered Cubic and Hexagonal Close-Packed Nickel Catalysts: A First-Principles Study

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And 10 more candidates considered.