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A bimetallic dodecaborate LiNaB₁₂H₁₂ has been successfully synthesized for the first time, through a sintering process of LiBH₄, NaBH₄ and B₁₀H₁₄. LiNaB₁₂H₁₂ has a cubic Pa-3 space group symmetry at room temperature, and transforms into a high temperature phase with Fm-3m symmetry at 488 K, which is lower than that of Li₂B₁₂H₁₂ and Na₂B₁₂H₁₂. The ionic conductivity at 550 K reaches 0.79 S/cm, which is approximately 8 times higher than that of Na₂B₁₂H₁₂ and 11 times higher than that of Li₂B₁₂H₁₂. The Li/Na compositional and thus an induced positional disorder in LiNaB₁₂H₁₂ are suggested to be responsible for the reduced phase transition temperature and the improved super ionic conductivity compared to its monometallic counterparts.

Synthesis of a Bimetallic Dodecaborate LiNaB₁₂H₁₂ with Outstanding Super Ionic Conductivity L. He, H.-W. Li, H. Nakajima, N. Tumanov, Y. Filinchuk, S.-J. Hwang, M. Sharma, H. Hagemann and E. Akiba Chemistry of Materials, 27 (16) (2015), p5483-5486 DOI:10.1021/acs.chemmater.5b01568 \| unige:75041 \| Abstract \| Article HTML \| Article PDF \| Supporting Info
A bimetallic dodecaborate LiNaB₁₂H₁₂ has been successfully synthesized for the first time, through a sintering process of LiBH₄, NaBH₄ and B₁₀H₁₄. LiNaB₁₂H₁₂ has a cubic Pa-3 space group symmetry at room temperature, and transforms into a high temperature phase with Fm-3m symmetry at 488 K, which is lower than that of Li₂B₁₂H₁₂ and Na₂B₁₂H₁₂. The ionic conductivity at 550 K reaches 0.79 S/cm, which is approximately 8 times higher than that of Na₂B₁₂H₁₂ and 11 times higher than that of Li₂B₁₂H₁₂. The Li/Na compositional and thus an induced positional disorder in LiNaB₁₂H₁₂ are suggested to be responsible for the reduced phase transition temperature and the improved super ionic conductivity compared to its monometallic counterparts.

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