[DSRP Evidence](https://dsrpevidence.org/)

# Ultrahigh pressure phase transition in ice

Osmond et al., 2026, Nature Materials — Chemistry

Patterns: [Distinctions](https://dsrpevidence.org/pattern/distinctions), [Systems](https://dsrpevidence.org/pattern/systems)

## In short

A qualitatively new, symmetry-distinct material category only exists once a sharp pressure threshold is crossed, produced by the whole crystal lattice reorganizing collectively rather than any single component changing.

## What they found (results)

Diamond-anvil-cell X-ray diffraction and Raman spectroscopy show ice X undergoes a first-order phase transition to a new orthorhombic phase (ice XXII, Pbcm symmetry) above 308(5) GPa, stable to at least 340(5) GPa.

These researchers were not testing DSRP. The finding is theirs; the correspondence to DSRP is drawn by this site.

[Source](https://doi.org/10.1038/s41563-026-02732-1)