Synthesis, structure and ionic conductivity in scheelite type Li0.5Ce0.5−𝑥Ln𝑥MoO4 (𝑥 = 0 and 0.25, Ln = Pr, Sm)

Journal of Chemical Sciences

Dipankar Saha¹  Tayur N Guru Row1¹  Giridhar Madras1¹  Aninda J Bhattacharyya¹ 

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

关键词: Scheelite;    ionic conductivity;    ac-impedance spectroscopy.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Scheelite type solid electrolytes, Li0.5Ce0.5−𝑥Ln𝑥MoO4 (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−𝑥Ln𝑥MoO4 (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.

【 授权许可】

Unknown