X-RAY CHARACTERIZATION OF ZN1-XCOXS SINGLE-CRYSTALS GROWN BY CHEMICAL-VAPOR TRANSPORT

Single Zn1-xCoxS crystals with x up to about 0.285 were grown by the c hemical vapour transport method using iodine as the transporting agent . The obtained single crystal grains were typically of up to 3-6 mm in size. The crystal quality was studied with the help of high-resolutio n diffractometry. The FWHM of rocking curves was of the order of 40''. Lattice constants measured by both, the powder diffractometry and hig h-resolution diffractometry, are reported and compared with the litera ture data. The extrapolated lattice constant for hypothetical CoS comp ound of sphalerite-type structure is 5.343(1) Angstrom. The interatomi c distances in Zn1-xCoxS and in related Fe and Mn containing sulphides are briefly discussed. (C) 1998 Elsevier Science S.A.