Effect of Pressure on the Lattice Parameters of Iodine, Stannic Iodide, and p-Di-iodobenzene

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Abstract
The effect of pressure to over 200 kbars has been measured on the lattice parameters of iodine, stannic iodide, and of p‐di‐iodobenzene. All three have a large component of van der Waals binding and each exhibits a compressibility which decreases with increasing pressure. On the basis of the estimated change in distances in the crystal, the approach to the metallic state in and perpendicular to the ac plane in iodine is explained. The approach to the metallic state and possible bond deformation in SnI4 is discussed. Possible molecular realignments in p‐di‐iodobenzene are proposed. The results on molecular crystals are contrasted with the behavior of TlI previously published.