Abstract
The double perovskite system Sr2−x Ce x NiMoO6−δ (SCNM) with 0.01 ≤ x ≤ 0.05 was synthesized by the citrate–nitrate auto-combustion synthesis route. Thermal studies were carried out by simultaneous differential scanning calorimetry and thermal gravimetry. Phase constitution was analyzed by powder X-ray diffraction (XRD). Rietveld refinement showed that the major phase exists in tetragonal form with space group I4/m. Microstructural investigations revealed the formation of uniform grains. The electrical conductivity studied by impedance spectroscopy in the temperature range 300–600 °C was found to follow a thermally activated process. The sample with x = 0.01 showed the highest conductivity with lowest activation energy. The electrical conductivity of the system was discussed in terms of identified impurity phases and charge density \(\left[{{\text{Mo}}_{{{\text{Mo}}^{6 +}}}^{5 +} {}^{\prime}} \right]\). The variation of electrical conductivity with composition was explained on the basis of X-ray photoelectron spectroscopy and XRD studies.
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One of the authors PK is thankful to MHRD for providing financial support in the form of Teaching Assistantship. We acknowledge the financial support from BRNS through Project No. 34/14/15/2015/BRNS.
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Kumar, P., Singh, N.K., Sinha, A.S.K. et al. Structural and electrical characterizations of cerium (Ce3+)-doped double perovskite system Sr2NiMoO6−δ . Appl. Phys. A 122, 828 (2016). https://doi.org/10.1007/s00339-016-0356-5
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DOI: https://doi.org/10.1007/s00339-016-0356-5