Thermal properties of three phosphorus chalcogenides were determined by adiabatic calorimetry and yielded entropies at 298.15°K. for P4S3, P4Se3, and P4Si0 of 48.60, 57.26, and 91.24 cal./(mole °K.), respectively. The P4S3 transforms to a plastically crystalline state at 313.90°K. with St = 7.85 cal./(mole °K.) and P4Se3 shows an anomalous increase in heat capacity suggesting such an effect slightly above 350°K. Diffraction data on P4S3 provided coefficients of thermal expansion on both phases and confirmation of the plastically crystalline nature of the Crystal I phase.
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