Materials Data on DyMg2Cu9 by Materials Project
Mg2DyCu9 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Mg is bonded in a 12-coordinate geometry to twelve Cu atoms. There are a spread of Mg–Cu bond distances ranging from 2.84–2.95 Å. Dy is bonded in a distorted hexagonal planar geometry to eighteen Cu atoms. There are six shorter (2.91 Å) and twelve longer (3.23 Å) Dy–Cu bond lengths. There are four inequivalent Cu sites. In the first Cu site, Cu is bonded to three equivalent Mg, two equivalent Dy, and seven Cu atoms to form a mixture of edge, face, and corner-sharing CuDy2Mg3Cu7 cuboctahedra. There are a spread of Cu–Cu bond distances ranging from 2.45–2.55 Å. In the second Cu site, Cu is bonded in a 12-coordinate geometry to three equivalent Dy and six equivalent Cu atoms. In the third Cu site, Cu is bonded to six equivalent Mg and six equivalent Cu atoms to form CuMg6Cu6 cuboctahedra that share corners with twelve equivalent CuDy2Mg3Cu7 cuboctahedra, edges with six equivalent CuMg6Cu6 cuboctahedra, and faces with eighteen equivalent CuDy2Mg3Cu7 cuboctahedra. In the fourth Cu site, Cu is bonded in a 12-coordinate geometry to three equivalent Dy and six equivalent Cu atoms.