Nuclear magnetic resonance investigation of lithium diffusion in Li5AlO4

Abstract

Nuclear magnetic relaxation rates of ⁷Li and conductivity in Li₅AlO₄ have been measured in the temperature range 20–700 °C. The spin–lattice relaxation rate T^–1₁ for ⁷Li has a maximum in the plot of T^–1₁ against temperature at ca. 600 °C. Quadrupole relaxation owing to vacancy diffusion was observed and a vacancy jump frequency of ν= 2.1 × 10¹¹ exp (–0.60/kT) with an activation energy of 0.60 ± 0.03 eV was obtained. The activation energy of conductivity was 0.61 ± 0.03 eV, which was in good agreement with that obtained from T^–1₁.