Sodium iodide crystal, illustration
Sodium iodide crystal, illustration. Sodium iodide (NaI) adopts the rock salt crystal lattice, Here, several cubic unit cells have been cut from a larger crystal. Each cell contains four units of NaI. The sodium ions (Na, gray) form a face centred cube, using the eight corners and the six faces. , purple) form a simple cube using the twelve edge positions and the full site at the center of the crystal. by GREG WILLIAMS/SCIENCE PHOTO LIBRARY
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