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Electromigration of impurity (0.1 to 1.3%) K ions in fcc Li 2 SO 4  has been studied at about 650 °C. It is found that the mobility of the impurity K ion is either slightly larger or approximately equal to that of the abundant Li ion. On the other hand, the diffusivity of the K-ion is known to be some 40% less than that of the Li-ion. Possible explanations of this apparent discrepancy are discussed. For hcp Li 0.4 Na 1.6 SO 4  at 560 °C the mobility is found to be some 55% higher for the Li ions than for the Na ions.

Electromigration in fcc Li 2 SO 4 (K) and in hcp Li 0.4 Na 1.6 SO 4