Pressure-Induced Growth of Carbon Tetrachloride Solid II in Solid Ib

Abstract

This paper describes the change in equilibrium forms of solid II of carbon tetrachloride as functions of temperature and pressure. The crystal was grown by increasing pressure using a diamond anvil cell (DAC). After a single crystal of the solid Ib was prepared from the liquid in the DAC under high pressure, the crystal grew and filled the compressed region of the DAC. Further compression of the DAC resulted in the growth of the solid II in the solid Ib. In the shape of the crystal II, hexagonal shapes appeared. This crystal shape varied from thick hexagonal plates to thin ones with increasing temperature and pressure. This variation was consistent for the anisotropy of the monoclinic unit cell predicted from the molecular arrangement in the unit cell. We may therefore be able to describe the morphology of the molecular crystals of which a molecule has a high symmetry.