Na8Hg3 crystallizes in the trigonal R-3c space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one Hg(1), one Hg(2), and two equivalent Hg(3) atoms to form a mixture of distorted edge and corner-sharing NaHg4 tetrahedra. In the second Na site, Na(2) is bonded in a distorted trigonal non-coplanar geometry to one Hg(3) and two equivalent Hg(1) atoms. In the third Na site, Na(3) is bonded to one Hg(2) and three equivalent Hg(1) atoms to form a mixture of distorted edge and corner-sharing NaHg4 tetrahedra. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one Hg(3) and three equivalent Hg(1) atoms. There are three inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted q6 geometry to two equivalent Na(1), two equivalent Na(3), two equivalent Na(4), and four equivalent Na(2) atoms. In the second Hg site, Hg(2) is bonded in a body-centered cubic geometry to two equivalent Na(3) and six equivalent Na(1) atoms. In the third Hg site, Hg(3) is bonded in a distorted q6 geometry to one Na(4), three equivalent Na(2), and six equivalent Na(1) atoms.
Na8Hg3 crystallizes in the trigonal R-3c space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one Hg(1), one Hg(2), and two equivalent Hg(3) atoms to form a mixture of distorted edge and corner-sharing NaHg4 tetrahedra. The Na(1)-Hg(1) bond length is 3.38 Å. The Na(1)-Hg(2) bond length is 3.13 Å. There is one shorter (3.19 Å) and one longer (3.35 Å) Na(1)-Hg(3) bond length. In the second Na site, Na(2) is bonded in a distorted trigonal non-coplanar geometry to one Hg(3) and two equivalent Hg(1) atoms. The Na(2)-Hg(3) bond length is 3.23 Å. There is one shorter (3.20 Å) and one longer (3.29 Å) Na(2)-Hg(1) bond length. In the third Na site, Na(3) is bonded to one Hg(2) and three equivalent Hg(1) atoms to form a mixture of distorted edge and corner-sharing NaHg4 tetrahedra. The Na(3)-Hg(2) bond length is 3.19 Å. All Na(3)-Hg(1) bond lengths are 3.33 Å. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one Hg(3) and three equivalent Hg(1) atoms. The Na(4)-Hg(3) bond length is 3.20 Å. All Na(4)-Hg(1) bond lengths are 3.28 Å. There are three inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted q6 geometry to two equivalent Na(1), two equivalent Na(3), two equivalent Na(4), and four equivalent Na(2) atoms. In the second Hg site, Hg(2) is bonded in a body-centered cubic geometry to two equivalent Na(3) and six equivalent Na(1) atoms. In the third Hg site, Hg(3) is bonded in a distorted q6 geometry to one Na(4), three equivalent Na(2), and six equivalent Na(1) atoms.