Materials Data on Na4CaSn6 by Materials Project
Na4CaSn6 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded in a 4-coordinate geometry to eight equivalent Sn atoms. There are four shorter (3.35 Å) and four longer (3.66 Å) Na–Sn bond lengths. In the second Na site, Na is bonded in a 6-coordinate geometry to six equivalent Sn atoms. All Na–Sn bond lengths are 3.27 Å. Ca is bonded in a 12-coordinate geometry to twelve equivalent Sn atoms. There are six shorter (3.34 Å) and six longer (3.63 Å) Ca–Sn bond lengths. Sn is bonded in a 10-coordinate geometry to five Na, two equivalent Ca, and three equivalent Sn atoms. There are two shorter (3.02 Å) and one longer (3.05 Å) Sn–Sn bond lengths.