Lithium ionic conductivity of Li 0.5 La 0.5 TiO 3 has been studied using nuclear magnetic
resonance (NMR) and admittance spectroscopy (AS) techniques. Spin-lattice relaxation and
electrical conductivity relaxation are well described in terms of stretched-exponential
correlation functions in the time domain of the form φ (t)= exp (-(t/τ) β), but showing different
relaxation times scales (τ 0= 1.4× 10− 11 s from NMR and τ 0= 10− 14 s from AS), and
activation energies (0.15 and 0.4 eV, respectively). Different β exponents, 1 from spin lattice …

Interest in Li ionic conductors has increased in recent years due to their potential
applications in solid-state batteries. Recently, high values of the ionic conductivity 10 3 (cm 1
at room temperature have been reported for Li containing oxides Li0. 53xR0. 5xTiO3 with
perovskite-related structure. 1–3 The maximum conductivity occurs for R La and for x 0.07,
its high values being due to Li ions partially occupying equivalent A sites of the ABO3
perovskite structure. The presence of many vacant A sites facilitates Li ions to move easily …