Top and side views of the atomic structures of (left) a sodium-silicon clathrate and (right) the same clathrate after the sodium atoms are removed. The yellow and green circles correspond to the silicon and sodium atoms respectively. Selected for an Editors’ Suggestion.

From the article:

Superconducting Open-Framework Allotrope of Silicon at Ambient Pressure
Ha-Jun Sung, W. H. Han, In-Ho Lee, and K. J. Chang
Phys. Rev. Lett. 120, 157001 (2018)

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