Results for “Er-K” | Engineering Papers

DOE OSTI2020

Materials Data on K3Er by Materials Project

K3Er is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a distorted body-centered cubic geometry to four equivalent K and four equivalent Er atoms. All K–K bond lengths are 4.21 Å. All K–Er bond lengths are 4.21 Å. In the second K site, K is bonded in a body-centered cubic geometry to eight equivalent K atoms. Er is bonded in a body-centered cubic geometry to eight equivalent K atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on K3Er by Materials Project

K3Er is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. K is bonded to eight equivalent K and four equivalent Er atoms to form distorted KK8Er4 cuboctahedra that share corners with four equivalent ErK12 cuboctahedra, corners with fourteen equivalent KK8Er4 cuboctahedra, edges with six equivalent ErK12 cuboctahedra, edges with twelve equivalent KK8Er4 cuboctahedra, faces with four equivalent ErK12 cuboctahedra, and faces with sixteen equivalent KK8Er4 cuboctahedra. There are a spread of K–K bond distances ranging from 4.15–4.44 Å. There are two shorter (4.27 Å) and two longer (4.30 Å) K–Er bond lengths. Er is bonded to twelve equivalent K atoms to form ErK12 cuboctahedra that share corners with six equivalent ErK12 cuboctahedra, corners with twelve equivalent KK8Er4 cuboctahedra, edges with eighteen equivalent KK8Er4 cuboctahedra, faces with eight equivalent ErK12 cuboctahedra, and faces with twelve equivalent KK8Er4 cuboctahedra.

36 MATERIALS SCIENCE↗