The material structure described by MgYb2Cu(GeO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(12), one O(5), one O(7), and one O(9) atom. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), and one O(9) atom to form distorted YbO7 pentagonal bipyramids that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra, and  an edgeedge with one Ge(4)O4 trigonal pyramid. In the second Yb site, Yb(2) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(10), one O(11), one O(8), and one O(9) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(11), one O(5), and one O(7) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 trigonal pyramid. In the second Ge site, Ge(2) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 trigonal pyramid. In the third Ge site, Ge(3) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(12), one O(4), one O(5), and one O(8) atom to form GeO4 trigonal pyramids that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(2)O4 tetrahedra, and  an edgeedge with one Yb(1)O7 pentagonal bipyramid. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Yb(1), one Yb(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Yb(1), one Yb(2), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Yb(1), one Yb(2), and one Ge(3) atom. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Yb(1), one Yb(2), and one Ge(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Yb(1), one Ge(1), and one Ge(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Yb(2), one Ge(2), and one Ge(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ge(1), and one Ge(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Yb(2), one Cu(1), and one Ge(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), one Yb(1), one Cu(1), and one Ge(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Yb(1), one Cu(1), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Yb(2), one Cu(1), and one Ge(1) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Mg(1), one Ge(2), and one Ge(4) atom. is represented by the CIF card [CIF]
data_Yb2MgCu(GeO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.230
_cell_length_b   7.307
_cell_length_c   7.519
_cell_angle_alpha   69.339
_cell_angle_beta   89.494
_cell_angle_gamma   75.209
_symmetry_Int_Tables_number   1
_cell_volume   258.920
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Yb  Yb0  1  0.035  0.772  0.439  1.0
  Yb  Yb1  1  0.991  0.241  0.545  1.0
  Mg  Mg2  1  0.076  0.647  0.939  1.0
  Cu  Cu3  1  0.007  0.023  1.000  1.0
  Ge  Ge4  1  0.534  0.834  0.790  1.0
  Ge  Ge5  1  0.471  0.161  0.221  1.0
  Ge  Ge6  1  0.555  0.584  0.241  1.0
  Ge  Ge7  1  0.453  0.397  0.768  1.0
  O  O8  1  0.826  0.865  0.685  1.0
  O  O9  1  0.248  0.059  0.370  1.0
  O  O10  1  0.735  0.590  0.427  1.0
  O  O11  1  0.255  0.433  0.572  1.0
  O  O12  1  0.360  0.673  0.737  1.0
  O  O13  1  0.621  0.312  0.309  1.0
  O  O14  1  0.713  0.654  0.020  1.0
  O  O15  1  0.788  0.269  0.809  1.0
  O  O16  1  0.214  0.716  0.157  1.0
  O  O17  1  0.743  0.989  0.178  1.0
  O  O18  1  0.282  0.030  0.815  1.0
  O  O19  1  0.289  0.347  0.993  1.0
[/CIF]
.
The material structure described by MgYb2Cu(GeO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(12), one O(5), one O(7), and one O(9) atom. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), and one O(9) atom to form distorted YbO7 pentagonal bipyramids that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra, and  an edgeedge with one Ge(4)O4 trigonal pyramid. In the second Yb site, Yb(2) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(10), one O(11), one O(8), and one O(9) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(11), one O(5), and one O(7) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 trigonal pyramid. In the second Ge site, Ge(2) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 trigonal pyramid. In the third Ge site, Ge(3) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(12), one O(4), one O(5), and one O(8) atom to form GeO4 trigonal pyramids that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(2)O4 tetrahedra, and  an edgeedge with one Yb(1)O7 pentagonal bipyramid. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Yb(1), one Yb(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Yb(1), one Yb(2), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Yb(1), one Yb(2), and one Ge(3) atom. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Yb(1), one Yb(2), and one Ge(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Yb(1), one Ge(1), and one Ge(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Yb(2), one Ge(2), and one Ge(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ge(1), and one Ge(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Yb(2), one Cu(1), and one Ge(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), one Yb(1), one Cu(1), and one Ge(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Yb(1), one Cu(1), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Yb(2), one Cu(1), and one Ge(1) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Mg(1), one Ge(2), and one Ge(4) atom. is represented by the CIF card [CIF]
data_Yb2MgCu(GeO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.230
_cell_length_b   7.307
_cell_length_c   7.519
_cell_angle_alpha   69.339
_cell_angle_beta   89.494
_cell_angle_gamma   75.209
_symmetry_Int_Tables_number   1
_cell_volume   258.920
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Yb  Yb0  1  0.035  0.772  0.439  1.0
  Yb  Yb1  1  0.991  0.241  0.545  1.0
  Mg  Mg2  1  0.076  0.647  0.939  1.0
  Cu  Cu3  1  0.007  0.023  1.000  1.0
  Ge  Ge4  1  0.534  0.834  0.790  1.0
  Ge  Ge5  1  0.471  0.161  0.221  1.0
  Ge  Ge6  1  0.555  0.584  0.241  1.0
  Ge  Ge7  1  0.453  0.397  0.768  1.0
  O  O8  1  0.826  0.865  0.685  1.0
  O  O9  1  0.248  0.059  0.370  1.0
  O  O10  1  0.735  0.590  0.427  1.0
  O  O11  1  0.255  0.433  0.572  1.0
  O  O12  1  0.360  0.673  0.737  1.0
  O  O13  1  0.621  0.312  0.309  1.0
  O  O14  1  0.713  0.654  0.020  1.0
  O  O15  1  0.788  0.269  0.809  1.0
  O  O16  1  0.214  0.716  0.157  1.0
  O  O17  1  0.743  0.989  0.178  1.0
  O  O18  1  0.282  0.030  0.815  1.0
  O  O19  1  0.289  0.347  0.993  1.0
[/CIF]
.