KCS

A new Li-containing phosphate, Li₂AlSr₂(PO₄)₃ was synthesized by molten salt method (crystal) and solid state reaction (powder). The structure of Li₂AlSr₂(PO₄)₃ was determined by single crystal X-ray diffraction. It crystallizes in the monoclinic space group P1 2₁/n (No. 14) with lattice parameters a = 4.945 ?, b = 22.088 ?, c = 8.632 ? and β = 91.47°. This compound composed of alternating layers of [LiAl(PO₄)₂]^2- layer and [LiSr₂PO₂]⁺² layer. Ionic conductivity was measured by impedance spectroscopy. Temperature dependences of the bulk ionic conductivity show Arrhenius behavior. Conductivity was found to be σ = 2.65 × 10^-4 S/cm at 667 K with activation energy E_a = 0.53 eV.