Spin–lattice relaxation time measurements of Na23 in the temperature range of 160 to 360 °C for different Ca++-doped crystals (35, 79, 170, 200, 700 ppm) show after subtracting the part related to the lattice vibrations that both isolated cation vacancies and vacancies associated with Ca++-ions make a contribution to the relaxation contrary to existing proposals taking into account only one kind of vacancies. For the motion enthalpy of a vacancy around the impurity ion one obtains 0·69 eV, for the motion enthalpy of a isolated vacancy 0·75 eV which are in good agreement with results from other methods.
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Berg et al. (1977) studied this question.
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