Materials Data on RbMg6Nb by Materials Project

Dataset · Sat May 02 04:00:00 EDT 2020

DOI:https://doi.org/10.17188/1666635· OSTI ID:1666635

RbMg6Nb crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Rb is bonded to twelve Mg atoms to form RbMg12 cuboctahedra that share corners with four equivalent RbMg12 cuboctahedra, corners with eight equivalent NbMg12 cuboctahedra, edges with eight equivalent MgRb2Mg8Nb2 cuboctahedra, faces with two equivalent RbMg12 cuboctahedra, faces with four equivalent MgRb2Mg8Nb2 cuboctahedra, and faces with four equivalent NbMg12 cuboctahedra. There are a spread of Rb–Mg bond distances ranging from 3.39–3.55 Å. There are four inequivalent Mg sites. In the first Mg site, Mg is bonded to two equivalent Rb, eight Mg, and two equivalent Nb atoms to form distorted MgRb2Mg8Nb2 cuboctahedra that share corners with twelve equivalent MgRb2Mg8Nb2 cuboctahedra, edges with four equivalent RbMg12 cuboctahedra, edges with four equivalent NbMg12 cuboctahedra, faces with two equivalent RbMg12 cuboctahedra, faces with two equivalent NbMg12 cuboctahedra, and faces with six equivalent MgRb2Mg8Nb2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.29–3.32 Å. There are one shorter (3.37 Å) and one longer (3.41 Å) Mg–Nb bond lengths. In the second Mg site, Mg is bonded in a 10-coordinate geometry to two equivalent Rb, six Mg, and two equivalent Nb atoms. There are one shorter (2.90 Å) and one longer (2.91 Å) Mg–Mg bond lengths. Both Mg–Nb bond lengths are 3.04 Å. In the third Mg site, Mg is bonded in a 10-coordinate geometry to two equivalent Rb, six Mg, and two equivalent Nb atoms. Both Mg–Nb bond lengths are 3.05 Å. In the fourth Mg site, Mg is bonded in a 10-coordinate geometry to two equivalent Rb, six Mg, and two equivalent Nb atoms. Both Mg–Nb bond lengths are 3.05 Å. Nb is bonded to twelve Mg atoms to form NbMg12 cuboctahedra that share corners with four equivalent NbMg12 cuboctahedra, corners with eight equivalent RbMg12 cuboctahedra, edges with eight equivalent MgRb2Mg8Nb2 cuboctahedra, faces with two equivalent NbMg12 cuboctahedra, faces with four equivalent RbMg12 cuboctahedra, and faces with four equivalent MgRb2Mg8Nb2 cuboctahedra.

• Research Organization: LBNL Materials Project; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Contributing Organization: The Materials Project; MIT; UC Berkeley; Duke; U Louvain
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1666635
• Report Number(s): mp-1017173
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Mg-Nb-Rb
RbMg6Nb
crystal structure