Abstract
In this work, we successfully substituted Nb on the Mo site of the La6MoO12 compound by incorporating Sm2O3 through the solution combustion method and investigated their structural, optical, and electrical properties. The X-ray diffraction profile confirmed a transition from the rhombohedral R2 to the R1 phase with increasing Nb. A red shift was found in the optical bandgap energy with increasing Nb concentration. Conductivity spectra showed a negative temperature coefficient of resistance (NTCR) behaviour for the samples. Conductivity and activation energy showed opposite nature through all the compositions. The maximum conductivity value was observed for La5.4Sm0.6Mo0.94Nb0.06O12±δ compound (R2 phase), which also exhibited the highest value of Fermi density following Mott's Variable Range Hopping (VRH) model.
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