Materials Data on Ac by Materials Project

Abstract

Ac is alpha Samarium structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are four inequivalent Ac sites. In the first Ac site, Ac is bonded to twelve Ac atoms to form a mixture of corner, edge, and face-sharing AcAc12 cuboctahedra. There are six shorter (3.96 Å) and six longer (4.01 Å) Ac–Ac bond lengths. In the second Ac site, Ac is bonded to twelve Ac atoms to form a mixture of corner, edge, and face-sharing AcAc12 cuboctahedra. There are three shorter (3.99 Å) and six longer (4.01 Å) Ac–Ac bond lengths. In the third Ac site, Ac is bonded to twelve Ac atoms to form a mixture of corner, edge, and face-sharing AcAc12 cuboctahedra. There are three shorter (3.99 Å) and six longer (4.01 Å) Ac–Ac bond lengths. In the fourth Ac site, Ac is bonded to twelve Ac atoms to form a mixture of corner, edge, and face-sharing AcAc12 cuboctahedra. There are a spread of Ac–Ac bond distances ranging from 3.96–4.01 Å.