Nuclear Magnetic Relaxation and Ionic Conductivity in LiNaSO4.
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The temperature dependence of the spin-lattice relaxation time for <SUP>7</SUP>Li has been measured in a single crystal of LiNaSO<SUB>4</SUB> 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<SUP>+</SUP> and Na<SUP>+</SUP> vacancies are estimated to be E<SUB>1</SUB>=0.70, eV and E<SUB>2</SUB>=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<SUB>m</SUB> for the ionic diffusion in the extrinsic region. These values of E<SUB>1</SUB>, E<SUB>2</SUB>, E<SUB>m</SUB> are well compared with the corresponding values of 0.70, eV, 1.24, eV and the intermediate value between 1.74, eV for Li<SUP>+</SUP> and 1.90, eV for Na<SUP>+</SUP> ions evaluated from the previous NMR measurements.
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