SOLVENT-THERMAL PREPARATION OF NANOCRYSTALLINE PYRITE COBALT DISULFIDE

Nanocrystalline pyrite cobalt disulfide has been successfully prepared using the solvent-thermal method by the reaction of anhydrous CoCl2 w ith Na2S3 at 180 degrees C, which is similar to the well known hydroth ermal process, except that toluene is substituted for water. The sulfu r-to-metal ratio of the as-prepared product is 1.99:1, which is determ ined by chemical analysis. X-ray diffraction analysis indicates that t he product is a single phase of pyrite cobalt disulfide. No Co-O vibra tions are found in the IR spectra. Transmission electron microscopy sh ows that the average particle size is about 22 nm. (C) 1998 Elsevier S cience S.A. All rights reserved.