Ionic conduction and 27Al MAS/NMR of B-site Al ion substitutions in La 4/3− yLi 3 yTi 2O 6

Abstract

The 27Al MAS/NMR spectra of La 4/3− y Li 3 y Ti 2− x Al 4 x/3 O 6 ( y = 0.21, x = 0.01–0.60) were studied by the Massiot fitting program. The result shows a single signal Q1 produced by the second-order quadrupole interaction in low concentrations of x = 0.01–0.28. But in the high concentrations of x = 0.30–0.60, there are two components Q1 and a small and narrow component Q2 obtained. The quadrupole interaction parameters η Q and ν Q were estimated. We firstly found that the quadrupole interaction parameters η Q and ν Q were correlated with La 3+ occupation, lattice parameters and Al 3+ position and affected the ionic conductivity in the materials.