Extended Data Fig. 1: X-ray diffraction measurements for α- and β-Bi4I4.
From: A weak topological insulator state in quasi-one-dimensional bismuth iodide
a, b, X-ray diffraction measurements taken with CuKα radiation from the ab planes of α- and β-Bi4I4 crystals used in our experiments. These two crystals were obtained by the quenching procedure (see Methods). The lattice parameters obtained by structural analysis using single-crystal X-ray diffraction are: a = 14.345 Å, b = 4.443 Å, c = 20.112 Å and β = 92.974° for the α-phase; and a = 14.406 Å, b = 4.432 Å, c = 10.475 Å and β = 107.463° for the β-phase.
