Superconductivity with critical temperatures of up to 25.5 K has recently been reported for alkali metal intercalates of β-MNX (M = Zr, Hf; X = Cl, Br); we have investigated the structures of these host lattices and found that they are not as reported in the literature but are isostructural with rhombohedral SmSI.
A. M. Fogg, J. S. O. Evans and D. O’Hare, Chem. Commun., 1998, 2269 DOI: 10.1039/A806415F
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