The compound described by Sm2Ge2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(6), and two equivalent O(2) atoms. In the third Sm site, Sm(3) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(13), one O(5), one O(8), and one O(9) atom. In the fourth Sm site, Sm(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(6), one O(7), one O(9), and two equivalent O(12) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(5), and one O(6) atom. In the second Ge site, Ge(2) 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 third Ge site, Ge(3) is bonded to one O(10), one O(12), one O(14), and one O(9) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(11), one O(13), one O(14), and one O(8) atom to form corner-sharing GeO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one Ge(1) atom. In the second O site, O(2) is bonded to one Sm(1), two equivalent Sm(2), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OSm3Ge tetrahedra. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sm(1), one Sm(2), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one Sm(2), and one Ge(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Sm(1), one Sm(3), and one Ge(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(2), one Sm(4), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Sm(1), one Sm(4), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sm(3), one Ge(2), and one Ge(4) atom. In the ninth O site, O(9) is bonded to one Sm(1), one Sm(3), one Sm(4), and one Ge(3) atom to form distorted corner-sharing OSm3Ge tetrahedra. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Sm(2), one Sm(4), and one Ge(3) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Sm(3), one Sm(4), and one Ge(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sm(3), two equivalent Sm(4), and one Ge(3) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Sm(3), one Sm(4), and one Ge(4) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Ge(3) and one Ge(4) atom. is represented by the CIF file [CIF]
data_Sm2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.908
_cell_length_b   6.902
_cell_length_c   12.436
_cell_angle_alpha   93.657
_cell_angle_beta   91.290
_cell_angle_gamma   91.891
_symmetry_Int_Tables_number   1
_cell_volume   591.261
_cell_formula_units_Z   4
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
  Sm  Sm0  1  0.683  0.172  0.885  1.0
  Sm  Sm1  1  0.955  0.674  0.884  1.0
  Sm  Sm2  1  0.368  0.238  0.629  1.0
  Sm  Sm3  1  0.883  0.919  0.638  1.0
  Sm  Sm4  1  0.117  0.081  0.362  1.0
  Sm  Sm5  1  0.632  0.762  0.371  1.0
  Sm  Sm6  1  0.045  0.326  0.116  1.0
  Sm  Sm7  1  0.317  0.828  0.115  1.0
  Ge  Ge8  1  0.163  0.149  0.884  1.0
  Ge  Ge9  1  0.491  0.673  0.833  1.0
  Ge  Ge10  1  0.856  0.386  0.617  1.0
  Ge  Ge11  1  0.379  0.736  0.600  1.0
  Ge  Ge12  1  0.621  0.264  0.400  1.0
  Ge  Ge13  1  0.144  0.614  0.383  1.0
  Ge  Ge14  1  0.509  0.327  0.167  1.0
  Ge  Ge15  1  0.837  0.851  0.116  1.0
  O  O16  1  0.768  0.908  0.987  1.0
  O  O17  1  0.000  0.339  0.917  1.0
  O  O18  1  0.299  0.723  0.917  1.0
  O  O19  1  0.656  0.512  0.879  1.0
  O  O20  1  0.364  0.212  0.812  1.0
  O  O21  1  0.997  0.988  0.812  1.0
  O  O22  1  0.621  0.869  0.782  1.0
  O  O23  1  0.391  0.568  0.702  1.0
  O  O24  1  0.708  0.221  0.685  1.0
  O  O25  1  0.932  0.599  0.689  1.0
  O  O26  1  0.223  0.923  0.619  1.0
  O  O27  1  0.038  0.230  0.571  1.0
  O  O28  1  0.591  0.836  0.552  1.0
  O  O29  1  0.703  0.441  0.505  1.0
  O  O30  1  0.297  0.559  0.495  1.0
  O  O31  1  0.409  0.164  0.448  1.0
  O  O32  1  0.962  0.770  0.429  1.0
  O  O33  1  0.777  0.077  0.381  1.0
  O  O34  1  0.068  0.401  0.311  1.0
  O  O35  1  0.292  0.779  0.315  1.0
  O  O36  1  0.609  0.432  0.298  1.0
  O  O37  1  0.379  0.131  0.218  1.0
  O  O38  1  0.003  0.012  0.188  1.0
  O  O39  1  0.636  0.788  0.188  1.0
  O  O40  1  0.344  0.488  0.121  1.0
  O  O41  1  0.701  0.277  0.083  1.0
  O  O42  1  1.000  0.661  0.083  1.0
  O  O43  1  0.232  0.092  0.013  1.0
[/CIF]
.
The compound described by Sm2Ge2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(6), and two equivalent O(2) atoms. In the third Sm site, Sm(3) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(13), one O(5), one O(8), and one O(9) atom. In the fourth Sm site, Sm(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(6), one O(7), one O(9), and two equivalent O(12) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(5), and one O(6) atom. In the second Ge site, Ge(2) 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 third Ge site, Ge(3) is bonded to one O(10), one O(12), one O(14), and one O(9) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(11), one O(13), one O(14), and one O(8) atom to form corner-sharing GeO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one Ge(1) atom. In the second O site, O(2) is bonded to one Sm(1), two equivalent Sm(2), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OSm3Ge tetrahedra. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sm(1), one Sm(2), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one Sm(2), and one Ge(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Sm(1), one Sm(3), and one Ge(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(2), one Sm(4), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Sm(1), one Sm(4), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sm(3), one Ge(2), and one Ge(4) atom. In the ninth O site, O(9) is bonded to one Sm(1), one Sm(3), one Sm(4), and one Ge(3) atom to form distorted corner-sharing OSm3Ge tetrahedra. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Sm(2), one Sm(4), and one Ge(3) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Sm(3), one Sm(4), and one Ge(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sm(3), two equivalent Sm(4), and one Ge(3) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Sm(3), one Sm(4), and one Ge(4) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Ge(3) and one Ge(4) atom. is represented by the CIF file [CIF]
data_Sm2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.908
_cell_length_b   6.902
_cell_length_c   12.436
_cell_angle_alpha   93.657
_cell_angle_beta   91.290
_cell_angle_gamma   91.891
_symmetry_Int_Tables_number   1
_cell_volume   591.261
_cell_formula_units_Z   4
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
  Sm  Sm0  1  0.683  0.172  0.885  1.0
  Sm  Sm1  1  0.955  0.674  0.884  1.0
  Sm  Sm2  1  0.368  0.238  0.629  1.0
  Sm  Sm3  1  0.883  0.919  0.638  1.0
  Sm  Sm4  1  0.117  0.081  0.362  1.0
  Sm  Sm5  1  0.632  0.762  0.371  1.0
  Sm  Sm6  1  0.045  0.326  0.116  1.0
  Sm  Sm7  1  0.317  0.828  0.115  1.0
  Ge  Ge8  1  0.163  0.149  0.884  1.0
  Ge  Ge9  1  0.491  0.673  0.833  1.0
  Ge  Ge10  1  0.856  0.386  0.617  1.0
  Ge  Ge11  1  0.379  0.736  0.600  1.0
  Ge  Ge12  1  0.621  0.264  0.400  1.0
  Ge  Ge13  1  0.144  0.614  0.383  1.0
  Ge  Ge14  1  0.509  0.327  0.167  1.0
  Ge  Ge15  1  0.837  0.851  0.116  1.0
  O  O16  1  0.768  0.908  0.987  1.0
  O  O17  1  0.000  0.339  0.917  1.0
  O  O18  1  0.299  0.723  0.917  1.0
  O  O19  1  0.656  0.512  0.879  1.0
  O  O20  1  0.364  0.212  0.812  1.0
  O  O21  1  0.997  0.988  0.812  1.0
  O  O22  1  0.621  0.869  0.782  1.0
  O  O23  1  0.391  0.568  0.702  1.0
  O  O24  1  0.708  0.221  0.685  1.0
  O  O25  1  0.932  0.599  0.689  1.0
  O  O26  1  0.223  0.923  0.619  1.0
  O  O27  1  0.038  0.230  0.571  1.0
  O  O28  1  0.591  0.836  0.552  1.0
  O  O29  1  0.703  0.441  0.505  1.0
  O  O30  1  0.297  0.559  0.495  1.0
  O  O31  1  0.409  0.164  0.448  1.0
  O  O32  1  0.962  0.770  0.429  1.0
  O  O33  1  0.777  0.077  0.381  1.0
  O  O34  1  0.068  0.401  0.311  1.0
  O  O35  1  0.292  0.779  0.315  1.0
  O  O36  1  0.609  0.432  0.298  1.0
  O  O37  1  0.379  0.131  0.218  1.0
  O  O38  1  0.003  0.012  0.188  1.0
  O  O39  1  0.636  0.788  0.188  1.0
  O  O40  1  0.344  0.488  0.121  1.0
  O  O41  1  0.701  0.277  0.083  1.0
  O  O42  1  1.000  0.661  0.083  1.0
  O  O43  1  0.232  0.092  0.013  1.0
[/CIF]
.