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Synthesis, structure and ionic conductivity in scheelite type Li0·5Ce0·5−x Ln x MoO4 (x = 0 and 0·25, Ln = Pr, Sm)

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Abstract

Scheelite type solid electrolytes, Li0·5Ce0·5−x Ln x MoO4 (x = 0 and 0·25, Ln = Pr, Sm) have been synthesized using a solid state method. Their structure and ionic conductivity (σ) were obtained by single crystal X-ray diffraction and ac-impedance spectroscopy, respectively. X-ray diffraction studies reveal a space group of I41/a for Li0·5Ce0·5−xLn x MoO4 (x = 0 and 0·25, Ln = Pr, Sm) scheelite compounds. The unsubstituted Li0·5Ce0·5MoO4 showed lithium ion conductivity ~10−5–10−3 Ω−1cm−1 in the temperature range of 300–700°C (σ = 2.5 × 10−3 Ω−1cm−1 at 700°C). The substituted compounds show lower conductivity compared to the unsubstituted compound, with the magnitude of ionic conductivity being two (in the high temperature regime) to one order (in the low temperature regime) lower than the unsubstituted compound. Since these scheelite type structures show significant conductivity, the series of compounds could serve in high temperature lithium battery operations.

Scheelite type solid electrolytes, Li0.5Ce0.5−xLnxMoO4 (x = 0 and 0.25, Ln = Pr, Sm) have been synthesized by a ceramic method and their structures solved by single crystal X-ray diffraction. These scheelite type compounds could serve in high temperature lithium battery operations due to significant conductivity in the desired temperature range.

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Acknowledgements

The authors thank Mr. I S Jarali for DSC and AAS measurements and Ms. Supti Das for conductivity measurements. TNG thanks the Department of Science and Technology (DST) for funding. We also thank funding under DST-FIST (Level II) for single crystal facility and Indian Institute of Science (IISc) for XPS facility.

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Authors and Affiliations

  1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560 012, India

    DIPANKAR SAHA, GIRIDHAR MADRAS, ANINDA J BHATTACHARYYA & TAYUR N GURU ROW

  2. Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560 012, India

    GIRIDHAR MADRAS

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  1. DIPANKAR SAHA
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SAHA, D., MADRAS, G., BHATTACHARYYA, A.J. et al. Synthesis, structure and ionic conductivity in scheelite type Li0·5Ce0·5−x Ln x MoO4 (x = 0 and 0·25, Ln = Pr, Sm). J Chem Sci 123, 5–13 (2011). https://doi.org/10.1007/s12039-011-0068-5

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