EPRInvestigation of Synthetic, Doped FeS₂ and RuS₂ Single Crystals

Abstract

Synthetic FeS2 and RuS2 single crystals were prepared by the flux method using PbCl2, bismut, and tellurium as different solvents. FeS2 and some RuS2 samples were doped with elementary vanadium, other RuS2 crystals with manganese and nickel. The EPR spectra revealed Mn2+ in the low-spin state and Ni2+. The lineshape of the Mn sextet turned out to be asymmetrical. In some RuS2 samples we detected an isotropic structureless rather narrow signal with a linewidth down to 0.05 mT and attributed it to the conductivity. Its lineshape becomes symmetrical and Lorentzian by grinding the samples to a polycrystalline powder. The EPR parameters of appropriate spinHamiltonians were determined. The intensities of the allowed and forbidden lines depended very differently on the microwave power due to different degrees of saturation.

Preparation and Crystal Growth of Transition Metal Dichalcogenides

“…On (b): The synthesis of RuS 2 single crystals from different molten elements (Se, Te, Sb Bi, Sn, Pb) was described , . It was also possible to grow RuS 2 crystals from a PbCl 2 melt …”

“…[251,[254][255][256] It was also possible to grow RuS 2 crystals from a PbCl 2 melt. [238] RuSe 2 : (a) [251,257,258] , (b) [251,255,256] On (a): RuSe 2 can be crystallized by chemical transport with Cl 2 or ICl 3 . [251,257,258] On (b): The synthesis of large single crystals of RuSe 2 from a tellurium melt was described.…”

“…Ru 1-x M x S 2 mixed phases (M = V, Mn, Fe, Ni): (a) [238,254] , (b) [238,254] On (a): The synthesis of mixed phases with a substitution in the cation sub-lattice takes place in the same way as that of the binary Ru chalcogenides.…”

“…On (b): The synthesis of FeS 2 single crystals in a Na 2 S/S melt is described., Alternatively FeS 2 can be crystallized from molten PbCl 2 , …”