Preparation and Superconductivity of Fe1-xSeSnx Superconductor
AbstractSn doped Fe1-xSe has been prepared by solid-state reaction through vacuum sintering process at 845oC for 3 hours and cooled in the closed air tube furnace. Precursor powder (FeSe) was mixed with Sn powder (with purity of 98.5%) obeying a stoichiometric ratio of Fe:Se:Sn = (1-x) :1 : (x), where x= 1-wt% Sn, 5-wt% Sn and 10-wt% Sn, respectively. The precursor was then inserted into dies to form pellet. The pellet was then inserted into a crucible and put on quartz tube that aimed to prevent the oxidation of iron during the heating process. Finally, the sample sintered in the furnace tube at 845oC with heating rate of 5oC/minute held for 3 hours.The result obtain show that Sn did not actually enter the crystal lattice β-FeSe, existing as an inclusion Fe instead on 2Ɵ=44.38o. Structurally, the addition Sn doped FeSe superconductors material can increase the volume fraction of the main tetragonal (β-FeSe) from 30.13% to 72.02% at addition of 1 wt%Sn; up to 54.59% at addition of 5 wt%Sn and 51.17% at addition of 10 wt%Sn. The morphology observation also displayed FeSe with the addition of Sn dopant has a large crystallite size with dissipation and the presence of porosity. And result temperature critical at 13.33 K to 15.87 K. All the factors mentioned above are contributed to the high Tc of Sn doped Fe1-xSe sample. The present work suggests that addition of 1 wt% Sn might be a promising element in improvement the superconductivity of Fe1-xSe.
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