It was noted that this solid-solution compound was a single-phase Li4SiO4 derivative that was composed of 50at%Li4SiO4 and 50at%Li5AlO4. It crystallized with a monoclinic unit cell (a = 0.5108nm, b = 0.5388nm, c = 0.6205nm,  = 90.40), and exhibited an ionic conductivity of 2.3 x 10-7S/cm at 25C.

B.J.Neudecker, W.Weppner: Journal of the Electrochemical Society, 1996, 143[7], 2198-204