1. Phase transitions and compressions of solid CH4, CD4 and O2
2. In solid CH4 phase III appears only under pressure. The phase boundary between phases II and III in theP-Tplane was accurately determined by the following work: A. J. Nijman and M. J. Trappeniers, Proc. Congr. AMPERE, 18th, Nottingham, 1974 (1975), p. 253.
3. The existence of a fourth phase under high pressure was reported in Refs. 39 and 40.
4. Theory of Phase Transitions in Solid Heavy Methane
5. Work accumulated up to 1972 is reviewed in the following article: M. Bloom and J. A. Morrison, “Surface and Defect Properties of Solids” (The Chemical Society, London, 1973), Vol. 2, p. 140.