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Three metallic dodecaborides, YB 12 , ZrB 12 and LuB 12 , have been investigated by electric-field gradient (EFG) measurements at the boron sites using the 11 B nuclear magnetic resonance (NMR) technique and by performing firstprinciples calculations. The NMR powder spectra reveal patterns typical for a completely asymmetric EFG tensor, i.e., an η parameter close to unity. The absolute values of V zz (the largest component of the EFG) are determined from the spectra and they range between 11 × 10 20 V m −2 and 11.6 × 10 20 V m −2 with an uncertainty of 0.8 × 10 20 V m −2 , being in very good agreement with the first-principles results. In addition the electronic structure and chemical bonding are analysed from partial densities of states and electron densities.

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