Abstract
The temperature dependence of the spin-lattice relaxation time for 7 Li has been measured in a single crystal of LiNaSO 4 over the temperature range of 450 K–770 K. The result can be explained by a mechanism of vacancy diffusion. The activation energies for the hopping of Li + and Na + vacancies are estimated to be E 1 =0.70 eV and E 2 =1.20 eV, respectively. In addition, the ionic conductivity has been measured as a function of frequency from 500 Hz to 20 MHz and the value of 1.59 eV is deduced as the activation energy, E m for the ionic diffusion in the extrinsic region. These values of E 1 , E 2 , E m are well compared with the corresponding values of 0.70 eV, 1.24 eV and the intermediate value between 1.74 eV for Li + and 1.90 eV for Na + ions evaluated from the previous NMR measurements.
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