The structure described by SrCaTi2(GeO5)2 crystallizes in the monoclinic P2_1 space group. Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. Ca(1) is bonded to one O(10), one O(2), one O(3), one O(5), one O(6), one O(7), and one O(9) atom to form distorted CaO7 pentagonal bipyramids that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 31-37°. In the second Ti site, Ti(2) is bonded to one O(1), one O(10), one O(3), one O(4), one O(6), and one O(7) atom to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 31-37°. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(6), one O(7), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ca(1)O7 pentagonal bipyramids, and  an edgeedge with one Ca(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 39-56°. In the second Ge site, Ge(2) is bonded to one O(1), one O(10), one O(5), and one O(8) atom to form GeO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, and corners with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 33-56°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Sr(1), one Ti(2), and one Ge(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ti(1), and one Ge(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(1), one Ti(1), and one Ti(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Ti(1), and one Ti(2) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Ca(1), one Ti(1), and one Ge(2) atom to form distorted corner-sharing OSrCaTiGe tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Ti(2), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ca(1), one Ti(2), and one Ge(1) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Sr(1), one Ti(1), and one Ge(2) atom. In the ninth O site, O(9) is bonded to one Sr(1), one Ca(1), one Ti(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OSrCaTiGe tetrahedra. In the tenth O site, O(10) is bonded to one Sr(1), one Ca(1), one Ti(2), and one Ge(2) atom to form a mixture of distorted corner and edge-sharing OSrCaTiGe tetrahedra. is represented by the CIF file [CIF]
data_SrCaTi2(GeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.673
_cell_length_b   5.673
_cell_length_c   7.304
_cell_angle_alpha   104.175
_cell_angle_beta   104.175
_cell_angle_gamma   106.080
_symmetry_Int_Tables_number   1
_cell_volume   206.241
_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
  Ca  Ca0  1  0.826  0.674  0.000  1.0
  Ge  Ge1  1  0.184  0.316  0.000  1.0
  Ge  Ge2  1  0.815  0.685  0.500  1.0
  O  O3  1  0.735  0.366  0.333  1.0
  O  O4  1  0.134  0.765  0.667  1.0
  O  O5  1  0.245  0.630  0.167  1.0
  O  O6  1  0.870  0.255  0.833  1.0
  O  O7  1  0.568  0.932  0.000  1.0
  O  O8  1  0.444  0.056  0.500  1.0
  O  O9  1  0.616  0.698  0.653  1.0
  O  O10  1  0.802  0.884  0.347  1.0
  O  O11  1  0.404  0.316  0.863  1.0
  O  O12  1  0.184  0.096  0.137  1.0
  Sr  Sr13  1  0.172  0.328  0.500  1.0
  Ti  Ti14  1  0.505  0.004  0.754  1.0
  Ti  Ti15  1  0.496  0.995  0.246  1.0
[/CIF]
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The structure described by SrCaTi2(GeO5)2 crystallizes in the monoclinic P2_1 space group. Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. Ca(1) is bonded to one O(10), one O(2), one O(3), one O(5), one O(6), one O(7), and one O(9) atom to form distorted CaO7 pentagonal bipyramids that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 31-37°. In the second Ti site, Ti(2) is bonded to one O(1), one O(10), one O(3), one O(4), one O(6), and one O(7) atom to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 31-37°. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(6), one O(7), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ca(1)O7 pentagonal bipyramids, and  an edgeedge with one Ca(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 39-56°. In the second Ge site, Ge(2) is bonded to one O(1), one O(10), one O(5), and one O(8) atom to form GeO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, and corners with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 33-56°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Sr(1), one Ti(2), and one Ge(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ti(1), and one Ge(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(1), one Ti(1), and one Ti(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Ti(1), and one Ti(2) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Ca(1), one Ti(1), and one Ge(2) atom to form distorted corner-sharing OSrCaTiGe tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Ti(2), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ca(1), one Ti(2), and one Ge(1) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Sr(1), one Ti(1), and one Ge(2) atom. In the ninth O site, O(9) is bonded to one Sr(1), one Ca(1), one Ti(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OSrCaTiGe tetrahedra. In the tenth O site, O(10) is bonded to one Sr(1), one Ca(1), one Ti(2), and one Ge(2) atom to form a mixture of distorted corner and edge-sharing OSrCaTiGe tetrahedra. is represented by the CIF file [CIF]
data_SrCaTi2(GeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.673
_cell_length_b   5.673
_cell_length_c   7.304
_cell_angle_alpha   104.175
_cell_angle_beta   104.175
_cell_angle_gamma   106.080
_symmetry_Int_Tables_number   1
_cell_volume   206.241
_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
  Ca  Ca0  1  0.826  0.674  0.000  1.0
  Ge  Ge1  1  0.184  0.316  0.000  1.0
  Ge  Ge2  1  0.815  0.685  0.500  1.0
  O  O3  1  0.735  0.366  0.333  1.0
  O  O4  1  0.134  0.765  0.667  1.0
  O  O5  1  0.245  0.630  0.167  1.0
  O  O6  1  0.870  0.255  0.833  1.0
  O  O7  1  0.568  0.932  0.000  1.0
  O  O8  1  0.444  0.056  0.500  1.0
  O  O9  1  0.616  0.698  0.653  1.0
  O  O10  1  0.802  0.884  0.347  1.0
  O  O11  1  0.404  0.316  0.863  1.0
  O  O12  1  0.184  0.096  0.137  1.0
  Sr  Sr13  1  0.172  0.328  0.500  1.0
  Ti  Ti14  1  0.505  0.004  0.754  1.0
  Ti  Ti15  1  0.496  0.995  0.246  1.0
[/CIF]
.