Journal
PHYSICAL REVIEW B
Volume 77, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.77.184101
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The pressure-induced transitions from molecular to nonmolecular CO2 crystals are systematically investigated by using first-principles lattice dynamics calculations. Geometrically, likely transition pathways are derived from the dynamical instability of the molecular crystals under high pressures. Layered CO2 crystals composed of a two-dimensional network of coiner-sharing CO4 tetrahedra are proposed as metastable products of high-pressure phases obtained through the transition pathways. The layered crystals are similar to phase VI in geometry and Raman spectrum.
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