Ionic conduction and 27Al MAS/NMR of B-site Al ion substitutions in La4/3−yLi3yTi2O6

The 27Al MAS/NMR spectra of La4/3−yLi3yTi2−xAl4x/3O6 (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 ηQ and νQ were estimated. We firstly found that the quadrupole interaction parameters ηQ and νQ were correlated with La3+ occupation, lattice parameters and Al3+ position and affected the ionic conductivity in the materials.