Molecular cryocrystals under pressure (a review)

Molecular cryocrystals (nitrogen, oxygen, fluorine, carbon monoxide and dioxide, etc.) belong to the simplest molecular systems undergoing phase transitions in the solid state. Investigations carried out during the last decades in the field of high and ultrahigh pressures, which have become possible owing to the diamond anvil technique and which allows attainment of pressures exceeding 1 Mbar and temperatures of 1000 K, have opened an astonishingly broad range of P–T phase diagrams of molecular cryocrystals. This article is a review of the entire body of the experimental data and theoretical results. The state-of-the-art of phase diagrams, structure and thermodynamic properties of solid phases, nature of phase transitions in the solid phase, and peculiarities of the melting curves of crystals of N2 type (N2, CO, CO2, N2O) and O2 type (O2 and F2) are discussed.

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