Abstract
In this research, we effectively substituted Mo with Nb in the La6MoO12 compound by incorporating Sm2O3 through the solution combustion method and investigated their structural and electrical properties. Analysis of the X-ray diffraction patterns validated a shift from the rhombohedral R2 phase to the R1 phase as the Nb concentration increased. Rietveld refinement of the X-ray diffraction data yielded comprehensive microstructural insights into the La5.4Sm0.6Mo0.85Nb0.15O12±δ compound (R1 phase). Energy-dispersive X-ray spectroscopy (EDX) and elemental mapping were employed to validate the homogeneous distribution of all elements across the compositions. Impedance spectra exhibited a negative temperature coefficient of resistance (NTCR) behavior in the samples. The La5.4Sm0.6Mo0.94Nb0.06O12±δ composition (in the R2 phase) displayed the highest bulk conductivity value. Analysis of different spectra revealed a scaling behavior indicative of a temperature-independent mechanism. Current-voltage (I-V) measurements confirmed the presence of leakage current attributed to interface-limited Schottky emission, with the La5.4Sm0.6Mo0.85Nb0.15O12±δ composition exhibiting the highest barrier height (0.83 eV).
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