Abstract
The long-unknown crystal structure of the high pressure phase scandium-II was solved by powder x-ray diffraction and was found to have tetragonal host channels along the $c$ axis and guest chains that are incommensurate with the host, as well as the high pressure phases of $\mathrm{Ba}$, $\mathrm{Sr}$, $\mathrm{Bi}$, and $\mathrm{Sb}$. The pressure dependences of the lattice constants, the incommensurability, the atomic distances, and the atomic volume were investigated.
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