Kinetics of transformation of chains in amorphous sulphur doped with phosphorus

The transformation rate of the chains in amorphous sulphur doped with 0.43, 0.86 and 1.28% at. P was examined by calorimetric method at 298 K. The sam ples were remelted at T-f=443 K. For description of the results the equatio n X=1-exp[-(kt)(z)] was used (X - transformation degree, t - time, k and z - constants). The admixtures of phosphorus inhibit the transformation stron gly. The constants k and z are less smaller for the samples S+P than for pu re sulphur. Samples S+1.28% at. P were examined in the range of the temperatures from 2 03 to 308 K. The activation energy is equal to E=86.6 kJ mol(-1) with stand ard error S-E=12.0 kJ mol(-1). The effect of the admixture of phosphorus on the kinetics of the nucleation and the growth of the nuclei was discussed.