Abstract
Titanium disulphide single crystals (Ti1+x S2) containing an excess of titanium have been grown and investigated to determine the atomic arrangement to the excess Ti atoms and their influence on the electrical properties of the crystals. The excess atoms lie in a Van der Waals gap which imposes short-range order on the atoms, but an anomaly in the resistance at low temperatures and diffuse scattering as seen in electron diffraction patterns are attributed to long-range disorder amongst the Ti atoms.