Abstract
Hexagonal ZrS2(2H-type) and rhombohedral NbS2(3R-type) single crystals were grown by the transport reactions between the constituent elements and an iodine carrier. The growing situation of ZrS2 crystals (max. 10×10×2 mm3) in the ampoule changed from the hotter zone to the cooler zone with the increase of the iodine concentration, whereas NbS2 crystals (max. 3×3×0.5 mm3) were usually in the cooler zone.
Although the {0001} surfaces of ZrS2 crystals are very smooth, those of NbS2 crystals exhibit vicinal faces which are characterized by the concentric arrangement of dislocations. Those vicinal surfaces disappeared in crystals grown under the conditions of lower supersaturations or higher temperatures with the same ΔT than the transport reactions from 950°C to 850°C.
