MgCd4(TcO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(7), one O(8), and one O(9) atom. There are four inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to one O(1), one O(10), one O(12), one O(4), one O(5), and one O(8) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 14-42°. In the second Tc site, Tc(2) is bonded to one O(11), one O(2), one O(3), one O(6), one O(7), and one O(9) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 29-39°. In the third Tc site, Tc(3) is bonded to one O(10), one O(12), one O(2), one O(3), one O(6), and one O(7) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 14-38°. In the fourth Tc site, Tc(4) is bonded to one O(1), one O(11), one O(4), one O(5), one O(8), and one O(9) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 31-42°. There are four inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 4-coordinate geometry to one O(10), one O(2), one O(8), and one O(9) atom. In the second Cd site, Cd(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(5), one O(7), one O(8), and one O(9) atom. In the third Cd site, Cd(3) is bonded in a 4-coordinate geometry to one O(11), one O(12), one O(4), one O(6), and one O(8) atom. In the fourth Cd site, Cd(4) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Mg(1), one Tc(1), one Tc(4), one Cd(2), and one Cd(4) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Tc(2), one Tc(3), one Cd(1), and one Cd(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Tc(2), one Tc(3), and one Cd(4) atom. In the fourth O site, O(4) is bonded to one Tc(1), one Tc(4), one Cd(3), and one Cd(4) atom to form distorted OCd2Tc2 tetrahedra that share  a cornercorner with one O(10)MgCd2Tc2 square pyramid,  a cornercorner with one O(12)Cd2Tc2 tetrahedra, corners with three equivalent O(11)Cd2Tc2 tetrahedra, and  an edgeedge with one O(12)Cd2Tc2 tetrahedra. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Tc(1), one Tc(4), one Cd(2), and one Cd(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Tc(2), one Tc(3), one Cd(3), and one Cd(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Tc(2), one Tc(3), one Cd(2), and one Cd(4) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Mg(1), one Tc(1), one Tc(4), one Cd(1), one Cd(2), and one Cd(3) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Mg(1), one Tc(2), one Tc(4), one Cd(1), and one Cd(2) atom. In the tenth O site, O(10) is bonded to one Mg(1), one Tc(1), one Tc(3), one Cd(1), and one Cd(2) atom to form corner-sharing OMgCd2Tc2 square pyramids. In the eleventh O site, O(11) is bonded to one Tc(2), one Tc(4), one Cd(3), and one Cd(4) atom to form corner-sharing OCd2Tc2 tetrahedra. In the twelfth O site, O(12) is bonded to one Tc(1), one Tc(3), one Cd(3), and one Cd(4) atom to form distorted OCd2Tc2 tetrahedra that share corners with two equivalent O(10)MgCd2Tc2 square pyramids,  a cornercorner with one O(4)Cd2Tc2 tetrahedra, corners with two equivalent O(11)Cd2Tc2 tetrahedra, and  an edgeedge with one O(4)Cd2Tc2 tetrahedra.
MgCd4(TcO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(7), one O(8), and one O(9) atom. The Mg(1)-O(1) bond length is 1.97 Å. The Mg(1)-O(10) bond length is 2.14 Å. The Mg(1)-O(7) bond length is 2.00 Å. The Mg(1)-O(8) bond length is 2.18 Å. The Mg(1)-O(9) bond length is 2.13 Å. There are four inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to one O(1), one O(10), one O(12), one O(4), one O(5), and one O(8) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 14-42°. The Tc(1)-O(1) bond length is 2.11 Å. The Tc(1)-O(10) bond length is 2.10 Å. The Tc(1)-O(12) bond length is 2.01 Å. The Tc(1)-O(4) bond length is 2.05 Å. The Tc(1)-O(5) bond length is 2.01 Å. The Tc(1)-O(8) bond length is 2.19 Å. In the second Tc site, Tc(2) is bonded to one O(11), one O(2), one O(3), one O(6), one O(7), and one O(9) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 29-39°. The Tc(2)-O(11) bond length is 2.03 Å. The Tc(2)-O(2) bond length is 2.23 Å. The Tc(2)-O(3) bond length is 2.06 Å. The Tc(2)-O(6) bond length is 1.99 Å. The Tc(2)-O(7) bond length is 2.04 Å. The Tc(2)-O(9) bond length is 2.16 Å. In the third Tc site, Tc(3) is bonded to one O(10), one O(12), one O(2), one O(3), one O(6), and one O(7) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 14-38°. The Tc(3)-O(10) bond length is 2.17 Å. The Tc(3)-O(12) bond length is 1.97 Å. The Tc(3)-O(2) bond length is 2.15 Å. The Tc(3)-O(3) bond length is 2.06 Å. The Tc(3)-O(6) bond length is 2.02 Å. The Tc(3)-O(7) bond length is 2.05 Å. In the fourth Tc site, Tc(4) is bonded to one O(1), one O(11), one O(4), one O(5), one O(8), and one O(9) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 31-42°. The Tc(4)-O(1) bond length is 2.07 Å. The Tc(4)-O(11) bond length is 2.04 Å. The Tc(4)-O(4) bond length is 2.05 Å. The Tc(4)-O(5) bond length is 2.04 Å. The Tc(4)-O(8) bond length is 2.26 Å. The Tc(4)-O(9) bond length is 2.18 Å. There are four inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 4-coordinate geometry to one O(10), one O(2), one O(8), and one O(9) atom. The Cd(1)-O(10) bond length is 2.15 Å. The Cd(1)-O(2) bond length is 2.23 Å. The Cd(1)-O(8) bond length is 2.37 Å. The Cd(1)-O(9) bond length is 2.37 Å. In the second Cd site, Cd(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(5), one O(7), one O(8), and one O(9) atom. The Cd(2)-O(1) bond length is 2.27 Å. The Cd(2)-O(10) bond length is 2.40 Å. The Cd(2)-O(2) bond length is 2.47 Å. The Cd(2)-O(5) bond length is 2.71 Å. The Cd(2)-O(7) bond length is 2.52 Å. The Cd(2)-O(8) bond length is 2.71 Å. The Cd(2)-O(9) bond length is 2.70 Å. In the third Cd site, Cd(3) is bonded in a 4-coordinate geometry to one O(11), one O(12), one O(4), one O(6), and one O(8) atom. The Cd(3)-O(11) bond length is 2.34 Å. The Cd(3)-O(12) bond length is 2.28 Å. The Cd(3)-O(4) bond length is 2.24 Å. The Cd(3)-O(6) bond length is 2.38 Å. The Cd(3)-O(8) bond length is 2.68 Å. In the fourth Cd site, Cd(4) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The Cd(4)-O(1) bond length is 2.64 Å. The Cd(4)-O(11) bond length is 2.33 Å. The Cd(4)-O(12) bond length is 2.51 Å. The Cd(4)-O(3) bond length is 2.36 Å. The Cd(4)-O(4) bond length is 2.56 Å. The Cd(4)-O(5) bond length is 2.30 Å. The Cd(4)-O(6) bond length is 2.73 Å. The Cd(4)-O(7) bond length is 2.83 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Mg(1), one Tc(1), one Tc(4), one Cd(2), and one Cd(4) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Tc(2), one Tc(3), one Cd(1), and one Cd(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Tc(2), one Tc(3), and one Cd(4) atom. In the fourth O site, O(4) is bonded to one Tc(1), one Tc(4), one Cd(3), and one Cd(4) atom to form distorted OCd2Tc2 tetrahedra that share  a cornercorner with one O(10)MgCd2Tc2 square pyramid,  a cornercorner with one O(12)Cd2Tc2 tetrahedra, corners with three equivalent O(11)Cd2Tc2 tetrahedra, and  an edgeedge with one O(12)Cd2Tc2 tetrahedra. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Tc(1), one Tc(4), one Cd(2), and one Cd(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Tc(2), one Tc(3), one Cd(3), and one Cd(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Tc(2), one Tc(3), one Cd(2), and one Cd(4) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Mg(1), one Tc(1), one Tc(4), one Cd(1), one Cd(2), and one Cd(3) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Mg(1), one Tc(2), one Tc(4), one Cd(1), and one Cd(2) atom. In the tenth O site, O(10) is bonded to one Mg(1), one Tc(1), one Tc(3), one Cd(1), and one Cd(2) atom to form corner-sharing OMgCd2Tc2 square pyramids. In the eleventh O site, O(11) is bonded to one Tc(2), one Tc(4), one Cd(3), and one Cd(4) atom to form corner-sharing OCd2Tc2 tetrahedra. In the twelfth O site, O(12) is bonded to one Tc(1), one Tc(3), one Cd(3), and one Cd(4) atom to form distorted OCd2Tc2 tetrahedra that share corners with two equivalent O(10)MgCd2Tc2 square pyramids,  a cornercorner with one O(4)Cd2Tc2 tetrahedra, corners with two equivalent O(11)Cd2Tc2 tetrahedra, and  an edgeedge with one O(4)Cd2Tc2 tetrahedra.