Effect of La and Ga substitution on the structural and magnetic properties of Pr2-yLayFe17-xGax Intermetallic Compound

In this study, the crystalline structure and magnetic properties of Pr2-yLayFe17-xGax polycrystalline compound are investigated by means of powder X-ray diffraction, vibrating Sample Magnetometer (VSM) and Superconducting Quantum Interference Device (SQUID) magnetometer. The ternary intermetallic compounds Pr2-yLayFe17-xGax have been synthesized and the results show that the single phase sample with the expected rhombohedral structure is formed. Upon La and Ga substitution, the lattice parameters are increased and due to the change of the anisotropy and exchange effects, the Curie temperature, magnetisation behavior and saturation magnetization is changed. The Curie temperature is decreased due to the increasing of unit cell by La substation whereas; the Ga substation for Fe in the samples causes the increases of Curie temperature. The La and Ga substation leads to the decrease of saturation magnetisation as a result of reduction of the average Fe–Fe hybridization and the increase of the content of the non-magnetic element.