Abstract
The location of the Li + ions in the superconducting Li 1+ x Ti 2− x O 4 solid solution (0≤ x≤0.33) has been determined by refinement of time-of-flight powder neutron diffraction data. The spinel structure is maintained throughout, with the substituting Li + directly replacing the Ti ions on the spinel B-sites (16d). AC susceptibility measurements of the superconducting transitions revealed a slight reduction in T c and a rapid reduction in the apparent volume fraction of superconductor at the metal-insulator boundary ( x ≈ 0.15), whilst for x<0.1 little difference in the superconducting properties was observed.
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