The material structure described by SrCa7Ti2Mn6O20 crystallizes in the triclinic P1 space group. Sr(1) is bonded in a 7-coordinate geometry to one O(10), one O(15), one O(17), one O(18), one O(2), one O(7), and one O(8) atom. There are seven inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(10), one O(14), one O(15), one O(3), one O(6), one O(8), and one O(9) atom. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one O(10), one O(16), one O(19), one O(2), one O(20), one O(7), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(16), one O(20), one O(3), one O(8), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 7-coordinate geometry to one O(12), one O(13), one O(15), one O(17), one O(18), one O(2), and one O(4) atom. In the fifth Ca site, Ca(5) is bonded in a 7-coordinate geometry to one O(13), one O(14), one O(15), one O(18), one O(3), one O(5), and one O(6) atom. In the sixth Ca site, Ca(6) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(13), one O(16), one O(19), one O(20), and one O(4) atom. In the seventh Ca site, Ca(7) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(13), one O(16), one O(20), one O(3), one O(5), and one O(6) atom. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(14), one O(4), and one O(7) atom to form TiO4 tetrahedra that share  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Ti(2)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the second Ti site, Ti(2) is bonded to one O(17), one O(19), one O(4), and one O(5) atom to form TiO4 tetrahedra that share  a cornercorner with one Ti(1)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid, and corners with two equivalent Mn(5)O5 trigonal bipyramids. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(15), one O(16), and one O(8) atom to form MnO5 trigonal bipyramids that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Ti(1)O4 tetrahedra, and corners with two equivalent Mn(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 14-25°. In the second Mn site, Mn(2) is bonded to one O(12), one O(14), one O(2), one O(3), and one O(9) atom to form MnO5 square pyramids that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Ti(1)O4 tetrahedra, and corners with two equivalent Mn(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 17-21°. In the third Mn site, Mn(3) is bonded to one O(10), one O(13), one O(15), one O(16), one O(2), and one O(3) atom to form corner-sharing MnO6 octahedra. In the fourth Mn site, Mn(4) is bonded to one O(11), one O(18), one O(20), one O(5), and one O(8) atom to form MnO5 trigonal bipyramids that share corners with two equivalent Mn(6)O5 square pyramids,  a cornercorner with one Ti(2)O4 tetrahedra, and corners with two equivalent Mn(1)O5 trigonal bipyramids. In the fifth Mn site, Mn(5) is bonded to one O(12), one O(17), one O(19), one O(6), and one O(9) atom to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(6)O5 square pyramid, corners with two equivalent Mn(2)O5 square pyramids, and corners with two equivalent Ti(2)O4 tetrahedra. In the sixth Mn site, Mn(6) is bonded to one O(10), one O(13), one O(18), one O(20), and one O(6) atom to form MnO5 square pyramids that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and corners with two equivalent Mn(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 15-17°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(3), one Ca(7), one Ti(1), and one Mn(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(2), one Ca(4), one Mn(2), and one Mn(3) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Ca(1), one Ca(3), one Ca(5), one Ca(7), one Mn(2), and one Mn(3) atom. In the fourth O site, O(4) is bonded to one Ca(4), one Ca(6), one Ti(1), and one Ti(2) atom to form distorted OCa2Ti2 tetrahedra that share corners with two equivalent O(13)Ca4Mn2 octahedra,  a cornercorner with one O(18)SrCa2Mn2 trigonal bipyramid, and corners with two equivalent O(12)Ca2Mn2 trigonal pyramids. The corner-sharing octahedral tilt angles are 8°. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(5), one Ca(7), one Ti(2), and one Mn(4) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(5), one Ca(7), one Mn(5), and one Mn(6) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Sr(1), one Ca(2), and one Ti(1) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(1), one Ca(3), one Mn(1), and one Mn(4) atom. In the ninth O site, O(9) is bonded to one Ca(1), one Ca(2), one Ca(3), one Mn(2), and one Mn(5) atom to form distorted corner-sharing OCa3Mn2 trigonal bipyramids. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(3), and one Mn(6) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Ca(6), one Ca(7), one Mn(1), and one Mn(4) atom. In the twelfth O site, O(12) is bonded to one Ca(4), one Ca(6), one Mn(2), and one Mn(5) atom to form distorted OCa2Mn2 trigonal pyramids that share corners with two equivalent O(4)Ca2Ti2 tetrahedra,  a cornercorner with one O(18)SrCa2Mn2 trigonal bipyramid, corners with two equivalent O(9)Ca3Mn2 trigonal bipyramids, and  an edgeedge with one O(13)Ca4Mn2 octahedra. In the thirteenth O site, O(13) is bonded to one Ca(4), one Ca(5), one Ca(6), one Ca(7), one Mn(3), and one Mn(6) atom to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(4)Ca2Ti2 tetrahedra,  an edgeedge with one O(12)Ca2Mn2 trigonal pyramid, and  a faceface with one O(18)SrCa2Mn2 trigonal bipyramid. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(5), one Ti(1), and one Mn(2) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(4), one Ca(5), one Mn(1), and one Mn(3) atom. In the sixteenth O site, O(16) is bonded in a 6-coordinate geometry to one Ca(2), one Ca(3), one Ca(6), one Ca(7), one Mn(1), and one Mn(3) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(4), one Ti(2), and one Mn(5) atom. In the eighteenth O site, O(18) is bonded to one Sr(1), one Ca(4), one Ca(5), one Mn(4), and one Mn(6) atom to form distorted OSrCa2Mn2 trigonal bipyramids that share  a cornercorner with one O(4)Ca2Ti2 tetrahedra,  a cornercorner with one O(12)Ca2Mn2 trigonal pyramid, and  a faceface with one O(13)Ca4Mn2 octahedra. In the nineteenth O site, O(19) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), one Ca(6), one Ti(2), and one Mn(5) atom. In the twentieth O site, O(20) is bonded in a 6-coordinate geometry to one Ca(2), one Ca(3), one Ca(6), one Ca(7), one Mn(4), and one Mn(6) atom. is represented by the CIF card [CIF]
data_SrCa7Ti2Mn6O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.897
_cell_length_b   7.769
_cell_length_c   7.963
_cell_angle_alpha   90.103
_cell_angle_beta   90.684
_cell_angle_gamma   90.476
_symmetry_Int_Tables_number   1
_cell_volume   488.488
_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
  Sr  Sr0  1  0.239  0.239  0.282  1.0
  Ca  Ca1  1  0.231  0.293  0.738  1.0
  Ca  Ca2  1  0.237  0.719  0.252  1.0
  Ca  Ca3  1  0.218  0.726  0.705  1.0
  Ca  Ca4  1  0.748  0.286  0.268  1.0
  Ca  Ca5  1  0.749  0.292  0.702  1.0
  Ca  Ca6  1  0.733  0.751  0.275  1.0
  Ca  Ca7  1  0.745  0.731  0.697  1.0
  Ti  Ti8  1  0.977  0.015  0.990  1.0
  Ti  Ti9  1  0.549  0.008  0.007  1.0
  Mn  Mn10  1  0.995  0.995  0.526  1.0
  Mn  Mn11  1  0.988  0.500  0.991  1.0
  Mn  Mn12  1  0.993  0.502  0.482  1.0
  Mn  Mn13  1  0.498  0.001  0.525  1.0
  Mn  Mn14  1  0.494  0.522  0.991  1.0
  Mn  Mn15  1  0.491  0.501  0.498  1.0
  O  O16  1  0.983  0.886  0.800  1.0
  O  O17  1  0.029  0.475  0.231  1.0
  O  O18  1  0.958  0.523  0.741  1.0
  O  O19  1  0.768  0.012  0.105  1.0
  O  O20  1  0.577  0.003  0.784  1.0
  O  O21  1  0.534  0.496  0.748  1.0
  O  O22  1  0.132  0.968  0.150  1.0
  O  O23  1  0.247  0.031  0.575  1.0
  O  O24  1  0.237  0.544  0.963  1.0
  O  O25  1  0.251  0.478  0.515  1.0
  O  O26  1  0.748  0.962  0.487  1.0
  O  O27  1  0.742  0.519  0.056  1.0
  O  O28  1  0.732  0.524  0.459  1.0
  O  O29  1  0.005  0.233  0.922  1.0
  O  O30  1  0.964  0.247  0.500  1.0
  O  O31  1  0.025  0.751  0.460  1.0
  O  O32  1  0.469  0.219  0.068  1.0
  O  O33  1  0.522  0.252  0.457  1.0
  O  O34  1  0.481  0.798  0.088  1.0
  O  O35  1  0.461  0.750  0.464  1.0
[/CIF]
.
The material structure described by SrCa7Ti2Mn6O20 crystallizes in the triclinic P1 space group. Sr(1) is bonded in a 7-coordinate geometry to one O(10), one O(15), one O(17), one O(18), one O(2), one O(7), and one O(8) atom. There are seven inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(10), one O(14), one O(15), one O(3), one O(6), one O(8), and one O(9) atom. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one O(10), one O(16), one O(19), one O(2), one O(20), one O(7), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(16), one O(20), one O(3), one O(8), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 7-coordinate geometry to one O(12), one O(13), one O(15), one O(17), one O(18), one O(2), and one O(4) atom. In the fifth Ca site, Ca(5) is bonded in a 7-coordinate geometry to one O(13), one O(14), one O(15), one O(18), one O(3), one O(5), and one O(6) atom. In the sixth Ca site, Ca(6) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(13), one O(16), one O(19), one O(20), and one O(4) atom. In the seventh Ca site, Ca(7) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(13), one O(16), one O(20), one O(3), one O(5), and one O(6) atom. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(14), one O(4), and one O(7) atom to form TiO4 tetrahedra that share  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Ti(2)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the second Ti site, Ti(2) is bonded to one O(17), one O(19), one O(4), and one O(5) atom to form TiO4 tetrahedra that share  a cornercorner with one Ti(1)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid, and corners with two equivalent Mn(5)O5 trigonal bipyramids. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(15), one O(16), and one O(8) atom to form MnO5 trigonal bipyramids that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Ti(1)O4 tetrahedra, and corners with two equivalent Mn(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 14-25°. In the second Mn site, Mn(2) is bonded to one O(12), one O(14), one O(2), one O(3), and one O(9) atom to form MnO5 square pyramids that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Ti(1)O4 tetrahedra, and corners with two equivalent Mn(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 17-21°. In the third Mn site, Mn(3) is bonded to one O(10), one O(13), one O(15), one O(16), one O(2), and one O(3) atom to form corner-sharing MnO6 octahedra. In the fourth Mn site, Mn(4) is bonded to one O(11), one O(18), one O(20), one O(5), and one O(8) atom to form MnO5 trigonal bipyramids that share corners with two equivalent Mn(6)O5 square pyramids,  a cornercorner with one Ti(2)O4 tetrahedra, and corners with two equivalent Mn(1)O5 trigonal bipyramids. In the fifth Mn site, Mn(5) is bonded to one O(12), one O(17), one O(19), one O(6), and one O(9) atom to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(6)O5 square pyramid, corners with two equivalent Mn(2)O5 square pyramids, and corners with two equivalent Ti(2)O4 tetrahedra. In the sixth Mn site, Mn(6) is bonded to one O(10), one O(13), one O(18), one O(20), and one O(6) atom to form MnO5 square pyramids that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and corners with two equivalent Mn(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 15-17°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(3), one Ca(7), one Ti(1), and one Mn(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(2), one Ca(4), one Mn(2), and one Mn(3) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Ca(1), one Ca(3), one Ca(5), one Ca(7), one Mn(2), and one Mn(3) atom. In the fourth O site, O(4) is bonded to one Ca(4), one Ca(6), one Ti(1), and one Ti(2) atom to form distorted OCa2Ti2 tetrahedra that share corners with two equivalent O(13)Ca4Mn2 octahedra,  a cornercorner with one O(18)SrCa2Mn2 trigonal bipyramid, and corners with two equivalent O(12)Ca2Mn2 trigonal pyramids. The corner-sharing octahedral tilt angles are 8°. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(5), one Ca(7), one Ti(2), and one Mn(4) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(5), one Ca(7), one Mn(5), and one Mn(6) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Sr(1), one Ca(2), and one Ti(1) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(1), one Ca(3), one Mn(1), and one Mn(4) atom. In the ninth O site, O(9) is bonded to one Ca(1), one Ca(2), one Ca(3), one Mn(2), and one Mn(5) atom to form distorted corner-sharing OCa3Mn2 trigonal bipyramids. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(3), and one Mn(6) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Ca(6), one Ca(7), one Mn(1), and one Mn(4) atom. In the twelfth O site, O(12) is bonded to one Ca(4), one Ca(6), one Mn(2), and one Mn(5) atom to form distorted OCa2Mn2 trigonal pyramids that share corners with two equivalent O(4)Ca2Ti2 tetrahedra,  a cornercorner with one O(18)SrCa2Mn2 trigonal bipyramid, corners with two equivalent O(9)Ca3Mn2 trigonal bipyramids, and  an edgeedge with one O(13)Ca4Mn2 octahedra. In the thirteenth O site, O(13) is bonded to one Ca(4), one Ca(5), one Ca(6), one Ca(7), one Mn(3), and one Mn(6) atom to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(4)Ca2Ti2 tetrahedra,  an edgeedge with one O(12)Ca2Mn2 trigonal pyramid, and  a faceface with one O(18)SrCa2Mn2 trigonal bipyramid. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(5), one Ti(1), and one Mn(2) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(4), one Ca(5), one Mn(1), and one Mn(3) atom. In the sixteenth O site, O(16) is bonded in a 6-coordinate geometry to one Ca(2), one Ca(3), one Ca(6), one Ca(7), one Mn(1), and one Mn(3) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(4), one Ti(2), and one Mn(5) atom. In the eighteenth O site, O(18) is bonded to one Sr(1), one Ca(4), one Ca(5), one Mn(4), and one Mn(6) atom to form distorted OSrCa2Mn2 trigonal bipyramids that share  a cornercorner with one O(4)Ca2Ti2 tetrahedra,  a cornercorner with one O(12)Ca2Mn2 trigonal pyramid, and  a faceface with one O(13)Ca4Mn2 octahedra. In the nineteenth O site, O(19) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), one Ca(6), one Ti(2), and one Mn(5) atom. In the twentieth O site, O(20) is bonded in a 6-coordinate geometry to one Ca(2), one Ca(3), one Ca(6), one Ca(7), one Mn(4), and one Mn(6) atom. is represented by the CIF card [CIF]
data_SrCa7Ti2Mn6O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.897
_cell_length_b   7.769
_cell_length_c   7.963
_cell_angle_alpha   90.103
_cell_angle_beta   90.684
_cell_angle_gamma   90.476
_symmetry_Int_Tables_number   1
_cell_volume   488.488
_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
  Sr  Sr0  1  0.239  0.239  0.282  1.0
  Ca  Ca1  1  0.231  0.293  0.738  1.0
  Ca  Ca2  1  0.237  0.719  0.252  1.0
  Ca  Ca3  1  0.218  0.726  0.705  1.0
  Ca  Ca4  1  0.748  0.286  0.268  1.0
  Ca  Ca5  1  0.749  0.292  0.702  1.0
  Ca  Ca6  1  0.733  0.751  0.275  1.0
  Ca  Ca7  1  0.745  0.731  0.697  1.0
  Ti  Ti8  1  0.977  0.015  0.990  1.0
  Ti  Ti9  1  0.549  0.008  0.007  1.0
  Mn  Mn10  1  0.995  0.995  0.526  1.0
  Mn  Mn11  1  0.988  0.500  0.991  1.0
  Mn  Mn12  1  0.993  0.502  0.482  1.0
  Mn  Mn13  1  0.498  0.001  0.525  1.0
  Mn  Mn14  1  0.494  0.522  0.991  1.0
  Mn  Mn15  1  0.491  0.501  0.498  1.0
  O  O16  1  0.983  0.886  0.800  1.0
  O  O17  1  0.029  0.475  0.231  1.0
  O  O18  1  0.958  0.523  0.741  1.0
  O  O19  1  0.768  0.012  0.105  1.0
  O  O20  1  0.577  0.003  0.784  1.0
  O  O21  1  0.534  0.496  0.748  1.0
  O  O22  1  0.132  0.968  0.150  1.0
  O  O23  1  0.247  0.031  0.575  1.0
  O  O24  1  0.237  0.544  0.963  1.0
  O  O25  1  0.251  0.478  0.515  1.0
  O  O26  1  0.748  0.962  0.487  1.0
  O  O27  1  0.742  0.519  0.056  1.0
  O  O28  1  0.732  0.524  0.459  1.0
  O  O29  1  0.005  0.233  0.922  1.0
  O  O30  1  0.964  0.247  0.500  1.0
  O  O31  1  0.025  0.751  0.460  1.0
  O  O32  1  0.469  0.219  0.068  1.0
  O  O33  1  0.522  0.252  0.457  1.0
  O  O34  1  0.481  0.798  0.088  1.0
  O  O35  1  0.461  0.750  0.464  1.0
[/CIF]
.