Magnetic properties of Fe-doped 2H-TaS₂

Abstract

Fe _x TaS₂ (x = 0.25, 0.33, and 0.4) was prepared by using a solid state reaction method. The crystallographic structure and magnetic properties of the prepared compounds were investigated by using X-ray Diffraction, superconducting quantum interference device magnetometer, and a Mössbauer spectrometer. The crystal structure of Fe _x TaS₂ (x = 0.25, 0.33, and 0.4) was found to be hexagonal with space group P6₃22. The lattice constants a ₀ and c ₀ increase with increasing Fe concentration. The magnetization and the coercivity also increase with increasing Fe concentration. The magnetic transition temperatures of Fe _x TaS₂ (x = 0.25, 0.33, and 0.4) were found to be 89, 150 and 47 K, respectively. The Curie-Weiss temperatures of Fe _x TaS2 (x = 0.25, 0.33, and 0.4) were found to be 80, 37, and −82 K, respectively. The isomer shift value of Fe_0.33TaS₂ at 300 K was 0.68 mm/s relative to the Fe metal, which is consistent with the Fe²⁺ valence state. The Debye temperature of Fe_0.33TaS₂ was determined to be Θ _D = 486 K.