Abstract
The nanocrystalline perovskite material Li 0.15La 0.28TaO 3 has been synthesized by alkoxide-free Pechini type sol gel method. 7Li NMR measurements were carried out using a Bruker Avance 300 spectrometer at 116 MHz over the temperature range 150 to 400 K. Longitudinal spin-lattice relaxation times ( T 1) measured by saturation recovery and longitudinal relaxation times in the rotating frame ( T 1ρ) measured using the pulse sequence ( π/2–spin lock τ acquisition) with lock radio-frequency field υ = 62.5 kHz and the T 2 relaxation time measured by Hahn echo are presented. The static Hahn-echo spectra show two different lithium sites in this perovskite oxide. Further, the relaxation measurements T 1 and T 1ρ show two different types of lithium cations with fast and slow dynamics.
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