La2Ge2O7 crystallizes in the triclinic P1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(5), one O(7), and one O(8) atom. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(2), one O(3), one O(6), and one O(9) atom. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(2), one O(3), one O(5), and one O(9) atom. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(3), one O(4), one O(5), 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(11), one O(2), one O(4), and one O(7) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(10), one O(14), one O(4), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the third Ge site, Ge(3) is bonded to one O(1), one O(3), one O(6), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded in a tetrahedral geometry to one O(12), one O(13), one O(5), and one O(9) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one La(1), one La(2), and one Ge(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one La(2), one La(3), one La(4), and one Ge(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one La(2), one La(3), one La(4), and one Ge(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one La(4), one Ge(1), and one Ge(2) atom. In the fifth O site, O(5) is bonded to one La(1), one La(3), one La(4), and one Ge(4) atom to form a mixture of distorted edge and corner-sharing OLa3Ge tetrahedra. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one La(2), one La(4), and one Ge(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one La(4), and one Ge(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one La(1), one Ge(2), and one Ge(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one La(2), one La(3), and one Ge(4) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one La(3), one La(4), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(2), one La(3), one La(4), and one Ge(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(1), one La(2), one La(4), and one Ge(4) atom. In the thirteenth O site, O(13) is bonded to one La(1), one La(2), one La(3), and one Ge(4) atom to form a mixture of distorted edge and corner-sharing OLa3Ge tetrahedra. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one La(1), one La(3), and one Ge(2) atom.
La2Ge2O7 crystallizes in the triclinic P1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(5), one O(7), and one O(8) atom. The La(1)-O(1) bond length is 2.51 Å. The La(1)-O(12) bond length is 2.76 Å. The La(1)-O(13) bond length is 2.43 Å. The La(1)-O(14) bond length is 2.44 Å. The La(1)-O(5) bond length is 2.56 Å. The La(1)-O(7) bond length is 2.56 Å. The La(1)-O(8) bond length is 2.52 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(2), one O(3), one O(6), and one O(9) atom. The La(2)-O(1) bond length is 2.44 Å. The La(2)-O(11) bond length is 2.44 Å. The La(2)-O(12) bond length is 2.86 Å. The La(2)-O(13) bond length is 2.52 Å. The La(2)-O(2) bond length is 2.56 Å. The La(2)-O(3) bond length is 2.98 Å. The La(2)-O(6) bond length is 2.34 Å. The La(2)-O(9) bond length is 2.52 Å. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(2), one O(3), one O(5), and one O(9) atom. The La(3)-O(10) bond length is 2.36 Å. The La(3)-O(11) bond length is 2.51 Å. The La(3)-O(13) bond length is 2.61 Å. The La(3)-O(14) bond length is 2.43 Å. The La(3)-O(2) bond length is 2.70 Å. The La(3)-O(3) bond length is 2.66 Å. The La(3)-O(5) bond length is 2.56 Å. The La(3)-O(9) bond length is 2.46 Å. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The La(4)-O(10) bond length is 2.47 Å. The La(4)-O(11) bond length is 2.72 Å. The La(4)-O(12) bond length is 2.62 Å. The La(4)-O(2) bond length is 2.66 Å. The La(4)-O(3) bond length is 2.43 Å. The La(4)-O(4) bond length is 2.95 Å. The La(4)-O(5) bond length is 2.49 Å. The La(4)-O(6) bond length is 2.45 Å. The La(4)-O(7) bond length is 2.56 Å. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(11), one O(2), one O(4), and one O(7) atom to form corner-sharing GeO4 tetrahedra. The Ge(1)-O(11) bond length is 1.76 Å. The Ge(1)-O(2) bond length is 1.77 Å. The Ge(1)-O(4) bond length is 1.82 Å. The Ge(1)-O(7) bond length is 1.73 Å. In the second Ge site, Ge(2) is bonded to one O(10), one O(14), one O(4), and one O(8) atom to form corner-sharing GeO4 tetrahedra. The Ge(2)-O(10) bond length is 1.73 Å. The Ge(2)-O(14) bond length is 1.72 Å. The Ge(2)-O(4) bond length is 1.80 Å. The Ge(2)-O(8) bond length is 1.78 Å. In the third Ge site, Ge(3) is bonded to one O(1), one O(3), one O(6), and one O(8) atom to form corner-sharing GeO4 tetrahedra. The Ge(3)-O(1) bond length is 1.74 Å. The Ge(3)-O(3) bond length is 1.76 Å. The Ge(3)-O(6) bond length is 1.73 Å. The Ge(3)-O(8) bond length is 1.82 Å. In the fourth Ge site, Ge(4) is bonded in a tetrahedral geometry to one O(12), one O(13), one O(5), and one O(9) atom. The Ge(4)-O(12) bond length is 1.76 Å. The Ge(4)-O(13) bond length is 1.79 Å. The Ge(4)-O(5) bond length is 1.79 Å. The Ge(4)-O(9) bond length is 1.74 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one La(1), one La(2), and one Ge(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one La(2), one La(3), one La(4), and one Ge(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one La(2), one La(3), one La(4), and one Ge(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one La(4), one Ge(1), and one Ge(2) atom. In the fifth O site, O(5) is bonded to one La(1), one La(3), one La(4), and one Ge(4) atom to form a mixture of distorted edge and corner-sharing OLa3Ge tetrahedra. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one La(2), one La(4), and one Ge(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one La(4), and one Ge(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one La(1), one Ge(2), and one Ge(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one La(2), one La(3), and one Ge(4) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one La(3), one La(4), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(2), one La(3), one La(4), and one Ge(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(1), one La(2), one La(4), and one Ge(4) atom. In the thirteenth O site, O(13) is bonded to one La(1), one La(2), one La(3), and one Ge(4) atom to form a mixture of distorted edge and corner-sharing OLa3Ge tetrahedra. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one La(1), one La(3), and one Ge(2) atom.