The compound described by Sr2Ca6Mn8O23 crystallizes in the orthorhombic Pmm2 space group. Sr(1) is bonded in a 11-coordinate geometry to one O(2), one O(4), one O(6), two equivalent O(10), two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 11-coordinate geometry to one O(3), one O(5), one O(7), two equivalent O(10), two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(11), two equivalent O(8), and two equivalent O(9) atoms. In the third Ca site, Ca(3) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(13), two equivalent O(8), and two equivalent O(9) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(11), and two equivalent O(8) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and  a cornercorner with one Mn(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 14-34°. In the second Mn site, Mn(2) is bonded to one O(10), one O(11), one O(2), one O(3), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and corners with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 4-25°. In the third Mn site, Mn(3) is bonded to one O(12), one O(13), one O(4), one O(5), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and corners with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 18-26°. In the fourth Mn site, Mn(4) is bonded to one O(12), one O(13), one O(6), one O(7), and two equivalent O(9) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 4-26°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(3) and two equivalent Mn(1) atoms to form distorted OCa2Mn2 tetrahedra that share corners with four equivalent O(9)SrCa3Mn2 octahedra and corners with two equivalent O(11)Ca2Mn2 tetrahedra. The corner-sharing octahedral tilt angles are 68°. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), two equivalent Ca(3), and two equivalent Mn(2) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Ca(2), and two equivalent Mn(3) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1) and two equivalent Mn(3) atoms. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Ca(2), and two equivalent Mn(4) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Ca(1) and two equivalent Mn(4) atoms. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(3) atom. In the ninth O site, O(9) is bonded to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(2), and one Mn(4) atom to form distorted OSrCa3Mn2 octahedra that share corners with two equivalent O(9)SrCa3Mn2 octahedra,  a cornercorner with one O(1)Ca2Mn2 tetrahedra,  a cornercorner with one O(11)Ca2Mn2 tetrahedra, edges with two equivalent O(9)SrCa3Mn2 octahedra, and  an edgeedge with one O(11)Ca2Mn2 tetrahedra. The corner-sharing octahedral tilt angles range from 3-4°. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Ca(1), one Mn(1), and one Mn(2) atom. In the eleventh O site, O(11) is bonded to two equivalent Ca(2), one Mn(1), and one Mn(2) atom to form distorted OCa2Mn2 tetrahedra that share corners with two equivalent O(9)SrCa3Mn2 octahedra,  a cornercorner with one O(1)Ca2Mn2 tetrahedra, edges with two equivalent O(9)SrCa3Mn2 octahedra, and  an edgeedge with one O(11)Ca2Mn2 tetrahedra. The corner-sharing octahedral tilt angles are 65°. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Ca(1), one Mn(3), and one Mn(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to two equivalent Ca(3), one Mn(3), and one Mn(4) atom. is represented by the CIF file [CIF]
data_Sr2Ca6Mn8O23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.793
_cell_length_b   7.573
_cell_length_c   7.641
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   451.005
_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  0.259  0.258  0.250  1.0
  Sr  Sr1  1  0.741  0.258  0.250  1.0
  Ca  Ca2  1  0.254  0.263  0.750  1.0
  Ca  Ca3  1  0.256  0.750  0.250  1.0
  Ca  Ca4  1  0.257  0.735  0.750  1.0
  Ca  Ca5  1  0.746  0.263  0.750  1.0
  Ca  Ca6  1  0.744  0.750  0.250  1.0
  Ca  Ca7  1  0.743  0.735  0.750  1.0
  Mn  Mn8  1  0.000  0.993  0.984  1.0
  Mn  Mn9  1  0.000  0.993  0.516  1.0
  Mn  Mn10  1  0.000  0.504  0.000  1.0
  Mn  Mn11  1  0.000  0.504  0.500  1.0
  Mn  Mn12  1  0.500  0.000  1.000  1.0
  Mn  Mn13  1  0.500  0.000  0.500  1.0
  Mn  Mn14  1  0.500  0.505  0.998  1.0
  Mn  Mn15  1  0.500  0.505  0.502  1.0
  O  O16  1  0.000  0.924  0.750  1.0
  O  O17  1  0.000  0.447  0.250  1.0
  O  O18  1  0.000  0.558  0.750  1.0
  O  O19  1  0.500  0.947  0.250  1.0
  O  O20  1  0.500  0.057  0.750  1.0
  O  O21  1  0.500  0.550  0.250  1.0
  O  O22  1  0.500  0.455  0.750  1.0
  O  O23  1  0.244  0.999  0.023  1.0
  O  O24  1  0.244  0.999  0.477  1.0
  O  O25  1  0.250  0.508  0.992  1.0
  O  O26  1  0.250  0.508  0.508  1.0
  O  O27  1  0.756  0.999  0.023  1.0
  O  O28  1  0.756  0.999  0.477  1.0
  O  O29  1  0.750  0.508  0.992  1.0
  O  O30  1  0.750  0.508  0.508  1.0
  O  O31  1  0.000  0.247  0.949  1.0
  O  O32  1  0.000  0.247  0.551  1.0
  O  O33  1  0.000  0.754  0.067  1.0
  O  O34  1  0.000  0.754  0.433  1.0
  O  O35  1  0.500  0.253  0.038  1.0
  O  O36  1  0.500  0.253  0.462  1.0
  O  O37  1  0.500  0.754  0.943  1.0
  O  O38  1  0.500  0.754  0.557  1.0
[/CIF]
.
The compound described by Sr2Ca6Mn8O23 crystallizes in the orthorhombic Pmm2 space group. Sr(1) is bonded in a 11-coordinate geometry to one O(2), one O(4), one O(6), two equivalent O(10), two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 11-coordinate geometry to one O(3), one O(5), one O(7), two equivalent O(10), two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(11), two equivalent O(8), and two equivalent O(9) atoms. In the third Ca site, Ca(3) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(13), two equivalent O(8), and two equivalent O(9) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(11), and two equivalent O(8) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and  a cornercorner with one Mn(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 14-34°. In the second Mn site, Mn(2) is bonded to one O(10), one O(11), one O(2), one O(3), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and corners with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 4-25°. In the third Mn site, Mn(3) is bonded to one O(12), one O(13), one O(4), one O(5), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and corners with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 18-26°. In the fourth Mn site, Mn(4) is bonded to one O(12), one O(13), one O(6), one O(7), and two equivalent O(9) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 4-26°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(3) and two equivalent Mn(1) atoms to form distorted OCa2Mn2 tetrahedra that share corners with four equivalent O(9)SrCa3Mn2 octahedra and corners with two equivalent O(11)Ca2Mn2 tetrahedra. The corner-sharing octahedral tilt angles are 68°. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), two equivalent Ca(3), and two equivalent Mn(2) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Ca(2), and two equivalent Mn(3) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1) and two equivalent Mn(3) atoms. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Ca(2), and two equivalent Mn(4) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Ca(1) and two equivalent Mn(4) atoms. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(3) atom. In the ninth O site, O(9) is bonded to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(2), and one Mn(4) atom to form distorted OSrCa3Mn2 octahedra that share corners with two equivalent O(9)SrCa3Mn2 octahedra,  a cornercorner with one O(1)Ca2Mn2 tetrahedra,  a cornercorner with one O(11)Ca2Mn2 tetrahedra, edges with two equivalent O(9)SrCa3Mn2 octahedra, and  an edgeedge with one O(11)Ca2Mn2 tetrahedra. The corner-sharing octahedral tilt angles range from 3-4°. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Ca(1), one Mn(1), and one Mn(2) atom. In the eleventh O site, O(11) is bonded to two equivalent Ca(2), one Mn(1), and one Mn(2) atom to form distorted OCa2Mn2 tetrahedra that share corners with two equivalent O(9)SrCa3Mn2 octahedra,  a cornercorner with one O(1)Ca2Mn2 tetrahedra, edges with two equivalent O(9)SrCa3Mn2 octahedra, and  an edgeedge with one O(11)Ca2Mn2 tetrahedra. The corner-sharing octahedral tilt angles are 65°. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Ca(1), one Mn(3), and one Mn(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to two equivalent Ca(3), one Mn(3), and one Mn(4) atom. is represented by the CIF file [CIF]
data_Sr2Ca6Mn8O23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.793
_cell_length_b   7.573
_cell_length_c   7.641
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   451.005
_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  0.259  0.258  0.250  1.0
  Sr  Sr1  1  0.741  0.258  0.250  1.0
  Ca  Ca2  1  0.254  0.263  0.750  1.0
  Ca  Ca3  1  0.256  0.750  0.250  1.0
  Ca  Ca4  1  0.257  0.735  0.750  1.0
  Ca  Ca5  1  0.746  0.263  0.750  1.0
  Ca  Ca6  1  0.744  0.750  0.250  1.0
  Ca  Ca7  1  0.743  0.735  0.750  1.0
  Mn  Mn8  1  0.000  0.993  0.984  1.0
  Mn  Mn9  1  0.000  0.993  0.516  1.0
  Mn  Mn10  1  0.000  0.504  0.000  1.0
  Mn  Mn11  1  0.000  0.504  0.500  1.0
  Mn  Mn12  1  0.500  0.000  1.000  1.0
  Mn  Mn13  1  0.500  0.000  0.500  1.0
  Mn  Mn14  1  0.500  0.505  0.998  1.0
  Mn  Mn15  1  0.500  0.505  0.502  1.0
  O  O16  1  0.000  0.924  0.750  1.0
  O  O17  1  0.000  0.447  0.250  1.0
  O  O18  1  0.000  0.558  0.750  1.0
  O  O19  1  0.500  0.947  0.250  1.0
  O  O20  1  0.500  0.057  0.750  1.0
  O  O21  1  0.500  0.550  0.250  1.0
  O  O22  1  0.500  0.455  0.750  1.0
  O  O23  1  0.244  0.999  0.023  1.0
  O  O24  1  0.244  0.999  0.477  1.0
  O  O25  1  0.250  0.508  0.992  1.0
  O  O26  1  0.250  0.508  0.508  1.0
  O  O27  1  0.756  0.999  0.023  1.0
  O  O28  1  0.756  0.999  0.477  1.0
  O  O29  1  0.750  0.508  0.992  1.0
  O  O30  1  0.750  0.508  0.508  1.0
  O  O31  1  0.000  0.247  0.949  1.0
  O  O32  1  0.000  0.247  0.551  1.0
  O  O33  1  0.000  0.754  0.067  1.0
  O  O34  1  0.000  0.754  0.433  1.0
  O  O35  1  0.500  0.253  0.038  1.0
  O  O36  1  0.500  0.253  0.462  1.0
  O  O37  1  0.500  0.754  0.943  1.0
  O  O38  1  0.500  0.754  0.557  1.0
[/CIF]
.