Features of structural ordering and magnetic properties of the cobalt intercalates of titanium dichalcogenides

Abstract

CoxTiS2 (x = 0.20, 0.30, 0.50, 0.75) compounds have a layered crystal structure with Ti atoms surrounded by the S octahedrons in the S-Ti-S layers and Co ions which could be surrounded both by the S octahedrons and tetrahedrons. The features of the crystal structure and magnetic properties of the polycrystalline CoxTiS2 samples were studied as a function of the cobalt concentration using X-ray diffraction and magnetization measurements. The disordered state of the Co atoms (x < 0.20) changes to the ordered one (x ≥ 0.20). The magnetic ordering arises at x = 0.20 with mostly antiferromagnetic interaction. For compound with x = 0.30 and 0.50 there is a weak ferromagnetic ordering. The ferromagnetic ordering is observed in Co0.75TiS2 below Tc = 375 K.