Raman Spectra in Molecular Solids: III.—Determination of the Phase Diagram of Solid P-Dichlorobenzene by High Pressure Raman Spectroscopy: Spoliation of the α-Phase

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Abstract
We have determined the phase diagram of solid p-dichlorobenzene by means of Raman spectroscopy up to five kilobars and we have shown that the triple point previously predicted between the three solid phases exists. The thermodynamical data for the different phase transitions are determined. We described a pressure treatment to get the equilibrium pressures at the transitions; this treatment shows that the “zone of indifference” can be diminished whereas the hysteresis range seems to be intrinsic to the solid sample. The explanation seems to lie in local stresses existing in the polycrystalline sample.