Abstract
Various compositions of Sr12xLaxMoO4+d (x = 0.05, 0.1, 0.2, and 0.3) compounds were prepared by solid state reaction route. The samples were characterized by powder-XRD, TG-DTA, and SEM-EDAX techniques. Formation of single crystalline phases of Sr12xLaxMoO4+d was confirmed from powder-XRD patterns. The thermal stability of La-doped SrMoO4 compounds was investigated by TG-DTA. Uniform grain distribution was observed in the SEM image of 10-20 mol.% La-substituted compositions. Needleshaped structures were observed in the SEM image of Sr0.3La0.1MoO4+d and were confirmed to be La2Mo2O9 by XRD examination. The electrical conductivity of these compounds was measured by AC-impedance technique in the temperature range of 373-1073 K in air ambience and compared with that of pristine SrMoO4. The electrical conductivity was found to decrease for La-substituted SrMoO4 compared to pristine SrMoO4. The diffusion coefficient calculated from the electrical conductivity was found to be in the range of 1.94 ± 0.02 3 10 213 to 1.15 ± 0.01 3 10 211 cm 2 /S at 873-1173 K for substituted composition and 3.47 ± 0.02 3 10 213 to 2.48 ± 0.01 3 10 210 cm 2 /S for pristine SrMoO4 at 673-1073 K temperature range.
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