Abstract
Recent a.c. electrical conductivity measurements on Li 2SO 4 incorporating WO 4 2− as guest ion in SO 4 2− sublattice over an extended composition range confirm the earlier results, viz WO 4 2− presence effects a higher conductivity in Li 2SO 2. This higher conductivity with lower rotational frequency WO 4 2− in the SO 4 2− sublattice is interpreted as clear-cut evidence that the anion-rotation “paddle-wheel” mechanism is not a major contributing factor to the high mobility of Li + in Li 2SO 4-based compounds. Additional experimental evidence from conductivity dependence on pressure, conductivity dependence on larger radius isovalent guest cation presence, and conductivity dependence on lattice volume expansion are interpreted in terms of a percolation ion transport mechanism in a lattice structure of increased “free volume” or openness.
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