Li3−2xMxInBr6 (M = Mg, Ca, Sr, Ba; x = 0 to 1.0) was synthesized and the cation substitution effect was investigated by means of X-ray diffraction, 7Li and 115In nuclear magnetic resonance and AC conductivity measurements. In Li3−2xMgxInBr6, the lattice constants a and c increased with an increase of x, but b and β did not show significant changes. In the high-temperature phase for Li3−2xMxInBr6 (M = Mg, Ca, Ba), the conductivity decreased with x, accompanied by a broadening of the 115In nuclear magnetic resonance spectra. In Li3−2xSrxInBr6 (x ≤ 0.7), the conductivity of the high-temperature phase also decreased with an increase of x, but LiSrInBr6 exhibited almost the same conductivity as Li3InBr6. On the other hand, the conductivity of the low-temperature phase in Li3−2xMgxInBr6 (x ≤ 0.4) increased with x, associated with a narrowing of the 7Li nuclear magnetic resonance spectra.

Li Ion Conductivity of Solid Electrolyte, Li3−2xMxInBr6 (M = Mg, Ca, Sr, Ba). Y.Tomita, H.Matsushita, H.Yonekura, Y.Yamauchi, K.Yamada, K.Kobayashi: Solid State Ionics, 2004, 174[1-4], 35-9