ChemInform Abstract: A Comparison of the Transport Properties of Lithium‐Stuffed Garnets and the Conventional Phases Li₃Ln₃Te₂O₁₂.

Abstract

A Comparison of the Transport Properties of Lithium-Stuffed Garnets and the Conventional Phases Li3Ln3Te2O12. -The structures of the new lithium-stuffed garnets Li6CaLa2Sb2O12 and Li6.4Ca1.4La1.6Sb2O12 are determined by neutron powder diffraction. They crystallize in the space group Ia3d and accommodate lithium in a complex distribution across oxide tetrahedra and octahedra. Impedance spectroscopic measurements show that Li 6 CaLa 2 Sb 2 O 12 exhibits substantially lower conductivity than many previously reported Li-stuffed garnets. Li3Ln3Te2O12 (Ln: Gd, Tb, Er, Lu) compounds with the conventional garnet stoichiometry show lower conductivity than the Li-stuffed garnets. The highest conductivity, existing in Li3Tb3Te2O12 is three orders of magnitude less than that of Li6CaLa2Sb2O12 at 450°C. The materials cannot be considered to provide fast ion conduction. -(CUSSEN*, E. J.; YIP, T. W. S.; O'NEILL, G.; O'CALLAGHAN, M. P.; J. Solid State Chem. 184 (2011) 2, 470-475, http://dx.