Materials Data on CaMg7 by Materials Project

Dataset · Fri Mar 31 04:00:00 EDT 2017

DOI:https://doi.org/10.17188/1652624· OSTI ID:1652624

CaMg7 crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Ca is bonded to twelve Mg atoms to form CaMg12 cuboctahedra that share corners with six equivalent CaMg12 cuboctahedra, corners with twelve MgCa2Mg10 cuboctahedra, edges with eighteen MgCa2Mg10 cuboctahedra, faces with two equivalent CaMg12 cuboctahedra, and faces with eighteen MgCa2Mg10 cuboctahedra. There are six shorter (3.28 Å) and six longer (3.32 Å) Ca–Mg bond lengths. There are four inequivalent Mg sites. In the first Mg site, Mg is bonded to two equivalent Ca and ten Mg atoms to form distorted MgCa2Mg10 cuboctahedra that share corners with four equivalent CaMg12 cuboctahedra, corners with fourteen MgCa2Mg10 cuboctahedra, edges with two equivalent CaMg12 cuboctahedra, edges with sixteen MgCa2Mg10 cuboctahedra, faces with two equivalent CaMg12 cuboctahedra, and faces with eighteen MgCa2Mg10 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.24–3.37 Å. In the second Mg site, Mg is bonded to two equivalent Ca and ten Mg atoms to form distorted MgCa2Mg10 cuboctahedra that share corners with four equivalent CaMg12 cuboctahedra, corners with fourteen MgCa2Mg10 cuboctahedra, edges with two equivalent CaMg12 cuboctahedra, edges with sixteen MgCa2Mg10 cuboctahedra, faces with two equivalent CaMg12 cuboctahedra, and faces with eighteen MgCa2Mg10 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.24–3.37 Å. In the third Mg site, Mg is bonded to two equivalent Ca and ten Mg atoms to form distorted MgCa2Mg10 cuboctahedra that share corners with eighteen MgCa2Mg10 cuboctahedra, edges with four equivalent CaMg12 cuboctahedra, edges with fourteen MgCa2Mg10 cuboctahedra, faces with two equivalent CaMg12 cuboctahedra, and faces with eighteen MgCa2Mg10 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.25–3.39 Å. In the fourth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgCa2Mg10 cuboctahedra, edges with eighteen MgCa2Mg10 cuboctahedra, faces with six equivalent CaMg12 cuboctahedra, and faces with fourteen MgCa2Mg10 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: 1652624
• Report Number(s): mp-1016276
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Ca-Mg
CaMg7
crystal structure