Preparation and Physical Properties of Fe xTaS 2 (0.15 ≤ x ≥ 0.50) Compounds

Abstract

The intercalation compounds of the Fe-Ta-S system were synthesized by beating the mixture of 1T-TaS 2 and metal Fe in a sealed evacuated silica tube, The single phase region was 0.15 ≤ x ≥ 0.50 in Fe x TaS 2. The hexagonal a-axis was almost constant, while the c-axis increased simply with increasing iron content x . Temperature dependence of electrical resistivity showed metallic behavior. Mössbauer effect measurements showed that the iron was high-spin state Fc 2+ in Fe x TaS 2. The temperature variation of magnetic susceptibility obeyed a Curie-Weiss law, The Weiss temperature θ decreased with x and changed the value from positive to negative at x ≃ 0.4 suggesting the change of exchange interactions from ferromagnetic to antiferromagnetic.