Fig. 1 (IMAGE)

Science China Press

Fig. 1

Caption

Superstructure with BHV ordering. A. NiAs-type primary cell (space group P63/mmc). The point groups at the Ir (purple circles) and Sb (grey circles) sites are D3d and D3h, respectively. B. Crystal structure of Ir16Sb18. Ir vacancies are indicated by red shadowed circles. C. Illustration of BHV ordering seen from the c-axis. Note the Ir and Sb atoms were omitted for clarity. D. High-angle annular dark-field (HAADF) micrograph along the a-axis. E. Intensity line profile of the region marked by the arrows. F. Projection of the BHV superstructure along the a-axis. G. HAADF micrograph of the Ir16Sb18 along the c-axis. The dark sites are the iridium vacancies. The inset shows one honeycomb hexagon at a higher magnification.

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