Crystal structure of β-MNX (M = Zr, Hf; X = Cl, Br)

Abstract
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.

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