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The hyperfine interactions in indium-tin-oxide were studied by 119 Sn Mössbauer spectroscopy. Polycrystalline samples with tin contents from 0.5 to 10 at% Sn on the cation sublattice were measured and compared to the results of 111 In and 111m Cd Perturbed Angular Correlation measurements. The Mössbauer data demonstrate that Sn ions are in a 4+ state. The values of the quadrupole splitting, isomer shift and area ratios undergo changes when increasing the Sn content. The tin cations show a strong preference for the B site versus the D site. The occupancy of Sn on each of the two non-equivalent cation sites also harmonizes with neutron diffraction data.

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