Dy2Ge2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one O(11), one O(2), one O(4), one O(5), one O(9), and two equivalent O(1) atoms. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(2), one O(4), one O(6), one O(7), and two equivalent O(3) atoms. In the third Dy site, Dy(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(5), one O(7), and one O(9) atom. In the fourth Dy site, Dy(4) is bonded in a 6-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(6), and one O(7) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(2), and one O(5) atom. In the third Ge site, Ge(3) is bonded to one O(13), one O(14), one O(6), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(11), one O(12), one O(14), and one O(9) atom to form corner-sharing GeO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Dy(3), two equivalent Dy(1), and one Ge(2) atom to form a mixture of distorted corner and edge-sharing ODy3Ge tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(2), one Dy(3), and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Dy(4), two equivalent Dy(2), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(3), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Dy(2), one Dy(4), and one Ge(3) atom. In the seventh O site, O(7) is bonded to one Dy(2), one Dy(3), one Dy(4), and one Ge(1) atom to form distorted corner-sharing ODy3Ge tetrahedra. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(3), and one Ge(4) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Dy(3), one Dy(4), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Dy(1), one Dy(3), and one Ge(4) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Dy(2), one Dy(3), and one Ge(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Dy(2), one Dy(4), and one Ge(3) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Dy(4), one Ge(3), and one Ge(4) atom.
Dy2Ge2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one O(11), one O(2), one O(4), one O(5), one O(9), and two equivalent O(1) atoms. The Dy(1)-O(11) bond length is 2.25 Å. The Dy(1)-O(2) bond length is 2.38 Å. The Dy(1)-O(4) bond length is 2.37 Å. The Dy(1)-O(5) bond length is 2.40 Å. The Dy(1)-O(9) bond length is 2.32 Å. There is one shorter (2.37 Å) and one longer (2.42 Å) Dy(1)-O(1) bond length. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(2), one O(4), one O(6), one O(7), and two equivalent O(3) atoms. The Dy(2)-O(12) bond length is 2.63 Å. The Dy(2)-O(13) bond length is 2.27 Å. The Dy(2)-O(2) bond length is 2.24 Å. The Dy(2)-O(4) bond length is 2.32 Å. The Dy(2)-O(6) bond length is 2.30 Å. The Dy(2)-O(7) bond length is 2.43 Å. There is one shorter (2.55 Å) and one longer (2.84 Å) Dy(2)-O(3) bond length. In the third Dy site, Dy(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(5), one O(7), and one O(9) atom. The Dy(3)-O(1) bond length is 2.40 Å. The Dy(3)-O(10) bond length is 2.36 Å. The Dy(3)-O(11) bond length is 2.33 Å. The Dy(3)-O(12) bond length is 2.39 Å. The Dy(3)-O(2) bond length is 2.60 Å. The Dy(3)-O(5) bond length is 2.32 Å. The Dy(3)-O(7) bond length is 2.46 Å. The Dy(3)-O(9) bond length is 2.55 Å. In the fourth Dy site, Dy(4) is bonded in a 6-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(6), and one O(7) atom. The Dy(4)-O(10) bond length is 2.24 Å. The Dy(4)-O(13) bond length is 2.27 Å. The Dy(4)-O(14) bond length is 2.35 Å. The Dy(4)-O(3) bond length is 2.33 Å. The Dy(4)-O(6) bond length is 2.27 Å. The Dy(4)-O(7) bond length is 2.40 Å. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form corner-sharing GeO4 tetrahedra. The Ge(1)-O(3) bond length is 1.78 Å. The Ge(1)-O(4) bond length is 1.75 Å. The Ge(1)-O(7) bond length is 1.80 Å. The Ge(1)-O(8) bond length is 1.80 Å. In the second Ge site, Ge(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(2), and one O(5) atom. The Ge(2)-O(1) bond length is 1.81 Å. The Ge(2)-O(10) bond length is 1.74 Å. The Ge(2)-O(2) bond length is 1.78 Å. The Ge(2)-O(5) bond length is 1.75 Å. In the third Ge site, Ge(3) is bonded to one O(13), one O(14), one O(6), and one O(8) atom to form corner-sharing GeO4 tetrahedra. The Ge(3)-O(13) bond length is 1.77 Å. The Ge(3)-O(14) bond length is 1.79 Å. The Ge(3)-O(6) bond length is 1.75 Å. The Ge(3)-O(8) bond length is 1.81 Å. In the fourth Ge site, Ge(4) is bonded to one O(11), one O(12), one O(14), and one O(9) atom to form corner-sharing GeO4 tetrahedra. The Ge(4)-O(11) bond length is 1.75 Å. The Ge(4)-O(12) bond length is 1.78 Å. The Ge(4)-O(14) bond length is 1.89 Å. The Ge(4)-O(9) bond length is 1.75 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Dy(3), two equivalent Dy(1), and one Ge(2) atom to form a mixture of distorted corner and edge-sharing ODy3Ge tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(2), one Dy(3), and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Dy(4), two equivalent Dy(2), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(3), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Dy(2), one Dy(4), and one Ge(3) atom. In the seventh O site, O(7) is bonded to one Dy(2), one Dy(3), one Dy(4), and one Ge(1) atom to form distorted corner-sharing ODy3Ge tetrahedra. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(3), and one Ge(4) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Dy(3), one Dy(4), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Dy(1), one Dy(3), and one Ge(4) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Dy(2), one Dy(3), and one Ge(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Dy(2), one Dy(4), and one Ge(3) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Dy(4), one Ge(3), and one Ge(4) atom.