Abstract
AbstractThe spin–lattice relaxation rate, T, of the 23Na and 39K nuclei in KNaSO4 and K3Na(SO4)2 crystals was determined in the temperature range 160–420 K. The results showed similar temperature dependences of T for both types of nuclei, indicating that the local environment has an important influence on T of the metal nuclei. Moreover, the T values of the 23Na and 39K nuclei in the two crystals were found to increase with increasing temperature, and T was determined to be proportional to Tk for both metals. In the case of KNaSO4 and K3Na(SO4)2, T was found to have a temperature dependence proportional to T2, indicating that Raman processes may be responsible for the relaxation of the 23Na and 39K nuclei. Therefore, for the 23Na and 39K nuclei in the two crystals, Raman processes with k = 2 are more effective in nuclear quadrupole relaxation than direct processes.
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