Influence of Quenching Treatments on Structure and Conductivity of the Li3xLa2/3-xTiO3 Series

摘要: The effect of high-temperature treatments on the structure and lithium mobility Li3xLa2/3-xTiO3 (0.03 ≤ x 0.167) series has been studied by HTXRD, Raman, NMR, impedance spectroscopies. Room temperature XRD patterns slowly cooled samples display a c-doubled perovskite with orthorhombic or tetragonal symmetries, whereas those quenched simple cubic perovskite. However, Raman spectra analyzed are interpreted, in all cases, symmetry which cation disorder increases content quenching treatments. existence small microtwinned domains, arranged along three directions perovskite, favors detection phase patterns. From 7Li NMR spectroscopy two-dimensional Li motion was detected ordered samples, becomes progressively three-dimensional as disordering increases. presence microdomains decreases dc-conductivity Li-poor samples.