Abstract
The lattice parameters of the mixed ZrS 2-ZrSe 2 system were determined as a function of composition employing Debye-Scherrer X-ray diffraction techniques. The α parameter reveals negative deviations from linearity with composition while the c parameter displays positive deviations. The unit cell volume of ZrS 2x Se 2(1− x was found to be a linear function of composition. Selected compounds of ZrS 2xSe 2(1− x) were synthesized by chemical vapor transport with iodine in the temperature gradient 870 → 770 °C, yielding mixed crystals of different morphologies which appear to be related to the composition of the starting material. The mass fluxes of the mixed system showed an increase with increasing selenium content. The transport products were richer in ZrSe 2 than the residual source materials when the ZrSe 2 content of the starting materials was greater than 50 mol.%. Mass transport rate studies of the ZrSSe-I system revealed an increasing mass flux with pressure.
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