• Synthesis, structure and ionic conductivity in scheelite type Li0.5Ce$_{0.5−x}$Ln$_x$MoO4 ($x = 0$ and 0.25, Ln = Pr, Sm)

• # Fulltext

https://www.ias.ac.in/article/fulltext/jcsc/123/01/0005-0013

• # Keywords

Scheelite; ionic conductivity; ac-impedance spectroscopy.

• # Abstract

Scheelite type solid electrolytes, Li0.5Ce$_{0.5−x}$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 $I4_1/a$ for Li0.5Ce$_{0.5−x}$Ln$_x$MoO4 ($x = 0$ and 0.25, Ln = Pr, Sm) scheelite compounds. The unsubstituted Li0.5Ce0.5MoO4 showed lithium ion conductivity $\sim 10^{−5}-10^{−3} \Omega^{−1}$cm-1 in the temperature range of 300-700°C ($\sigma = 2.5 \times 10^{−3} \Omega^{−1}$cm-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.

• # Author Affiliations

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

• # Journal of Chemical Sciences

Volume 134, 2022
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• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019