Ice IV
Ice IV was discovered by the Nobel prize winner Percy Williams Bridgman in 1935 (Ref. 1). Ice IV is metastable, having no region of stability in the ice phase diagram.
References
- 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)
- 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)