Ice IV

Ice IV was discovered by the Nobel prize winner Percy Williams Bridgman in 1935 (Ref. 1).

References

1. P. W. Bridgman "The Pressure-Volume-Temperature Relations of the Liquid, and the Phase Diagram of Heavy Water", Journal of Chemical Physics 3 pp. 597-605 (1935)
2. C.G. Salzmann, I. Kohl, T. Loerting, E. Mayer, and A. Hallbrucker "Pure ices IV and XII from high-density amorphous ice", Canadian Journal of Physics 81 pp. 25-32 (2003)