Materials Data on MgCd2 by Materials Project

Dataset · Sun May 03 04:00:00 EDT 2020

DOI:https://doi.org/10.17188/1727701· OSTI ID:1727701

MgCd2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Mg is bonded to nine equivalent Mg and three equivalent Cd atoms to form distorted MgMg9Cd3 cuboctahedra that share corners with six equivalent MgMg9Cd3 cuboctahedra, corners with twelve CdCd12 cuboctahedra, edges with six equivalent CdMg3Cd9 cuboctahedra, edges with twelve equivalent MgMg9Cd3 cuboctahedra, faces with eight CdCd12 cuboctahedra, and faces with twelve equivalent MgMg9Cd3 cuboctahedra. There are six shorter (3.12 Å) and three longer (3.26 Å) Mg–Mg bond lengths. All Mg–Cd bond lengths are 3.20 Å. There are three inequivalent Cd sites. In the first Cd site, Cd is bonded to twelve Cd atoms to form CdCd12 cuboctahedra that share corners with six equivalent MgMg9Cd3 cuboctahedra, corners with twelve CdCd12 cuboctahedra, edges with eighteen CdCd12 cuboctahedra, a faceface with one MgMg9Cd3 cuboctahedra, and faces with nineteen CdCd12 cuboctahedra. There are a spread of Cd–Cd bond distances ranging from 3.12–3.25 Å. In the second Cd site, Cd is bonded to three equivalent Mg and nine Cd atoms to form distorted CdMg3Cd9 cuboctahedra that share corners with six equivalent MgMg9Cd3 cuboctahedra, corners with twelve CdMg3Cd9 cuboctahedra, edges with six equivalent MgMg9Cd3 cuboctahedra, edges with twelve CdCd12 cuboctahedra, faces with seven equivalent MgMg9Cd3 cuboctahedra, and faces with thirteen CdCd12 cuboctahedra. All Cd–Cd bond lengths are 3.12 Å. In the third Cd site, Cd is bonded to twelve Cd atoms to form CdCd12 cuboctahedra that share corners with six equivalent MgMg9Cd3 cuboctahedra, corners with twelve CdMg3Cd9 cuboctahedra, edges with eighteen CdCd12 cuboctahedra, a faceface with one MgMg9Cd3 cuboctahedra, and faces with nineteen CdCd12 cuboctahedra. There are six shorter (3.12 Å) and three longer (3.25 Å) Cd–Cd bond lengths.

• 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: 1727701
• Report Number(s): mp-1039056
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Cd-Mg
MgCd2
crystal structure