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Effect of La-Substitution on the Electrical Conductivity of Sr1−x La x MoO4+δ (x = 0-0.3) Compounds

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Abstract

Various compositions of Sr1−x La x MoO4+δ (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 Sr1−x La x MoO4+δ 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. Needle-shaped structures were observed in the SEM image of Sr0.3La0.1MoO4+δ 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 × 10−13 to 1.15 ± 0.01 × 10−11 cm2/S at 873-1173 K for substituted composition and 3.47 ± 0.02 × 10−13 to 2.48 ± 0.01 × 10−10 cm2/S for pristine SrMoO4 at 673-1073 K temperature range.

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Acknowledgments

The authors gratefully acknowledge Dr. R. Sudha and Mr. Swapan Kumar Mahato of Materials Chemistry Division, Chemistry Group, IGCAR for recording the SEM-EDAX of the samples and Mr. Sajal Ghosh for recording the TG/GTA data of the sample.

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Authors and Affiliations

  1. Materials Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    Binoy Kumar Maji, Hrudananda Jena & K. V. Govindan Kutty

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  1. Binoy Kumar Maji
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  2. Hrudananda Jena
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  3. K. V. Govindan Kutty
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Correspondence to Hrudananda Jena.

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Maji, B.K., Jena, H. & Govindan Kutty, K.V. Effect of La-Substitution on the Electrical Conductivity of Sr1−x La x MoO4+δ (x = 0-0.3) Compounds. J. of Materi Eng and Perform 23, 3126–3132 (2014). https://doi.org/10.1007/s11665-014-1053-1

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  • DOI: https://doi.org/10.1007/s11665-014-1053-1

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