| Double Perovskite compounds LaKFe2-xMoxO6 and La2-xKxFe2-xMoxO6 (x=0.6,0.7,0.8, 0.9) samples have been prepared by Sol-Gel processing. The structure, electrical transports and magnetic properties have been studied by x-ray powder diffraction, electrical resistivity measurement and vibrating sample magnetometer (VSM), respectively. The main results of this work are as follows:The program Fullprof is used for the Rietveld refinement of the crystal structure of the compound LaKFe1.2Mo0.8O6.The crystal structure presents monoclinic system.The space group is P21/n; and K2MoO6 impurity phase exists in the sample. It is calculated that the valence of Fe is +3.077, that of Mo is+5.215.Thermal magnetization (M-T) shows that Curie temperature is over 300K and the magnetization decreases slowly with temperature, the magnetic moment in the FC mode is higher than that in the ZFC mode. The electrical behaver of the samples belongs to the characteristic of the semi-conductor property, the electrical transport can be described by variable range hopping of small polaron model.The crystal structure of the samples LaKFe2-xMoxO6 (x=0.6,0.7,0.8,0.9) presents monoclinic P21/n symmetry. The lattice parameters increase with x.The M-T curve shows that the magnetic moment increases with x decreasing; the Curie temperature is over 300K and the magnetization decreases slowly with temperature, the magnetic moment in the FC mode is higher than that in the ZFC mode. The electrical behaver of the samples belongs to the characteristic of the semi-conductor property; the electrical transport can be described by variable range hopping of small polaron model.The crystal structure of the samples La2-xKxFe2-xMoxO6 (x=0.6,0.7,0.8,0.9) presents monoclinic P21/n symmetry. With the x decreasing the lattice parameter increases and then decreases. The electrical behaver of the samples belongs to the characteristic of the semi-conductor. The magnetic and the electrical transport are consistent with the LaKFe2-xMoxO6 series.
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