The compound described by SrMgCo(PO4)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(15), one O(4), one O(6), one O(7), two equivalent O(1), and two equivalent O(12) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(16), one O(3), one O(5), one O(8), two equivalent O(11), and two equivalent O(2) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(4), one O(7), and one O(9) atom. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to one O(10), one O(14), one O(2), one O(3), one O(8), and one O(9) atom. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(13), one O(15), one O(16), one O(5), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one P(4)O4 tetrahedra. In the second Co site, Co(2) is bonded to one O(14), one O(15), one O(16), one O(6), one O(7), and one O(9) atom to form distorted CoO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(13), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the second P site, P(2) is bonded to one O(14), one O(2), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-58°. In the third P site, P(3) is bonded to one O(11), one O(16), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-59°. In the fourth P site, P(4) is bonded to one O(10), one O(12), one O(15), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-59°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Mg(1), and one P(1) atom to form distorted edge-sharing OSr2MgP trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Sr(2), one Mg(2), and one P(2) atom to form distorted edge-sharing OSr2MgP trigonal pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(2), one Co(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Co(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one Co(2), and one P(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Mg(2), one Co(1), and one P(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Mg(1), one Mg(2), one Co(2), and one P(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Mg(2), one Co(1), and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to two equivalent Sr(2) and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mg(1), one Co(1), and one P(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Mg(2), one Co(2), and one P(2) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Sr(1), one Co(1), one Co(2), and one P(4) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Sr(2), one Co(1), one Co(2), and one P(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrMgCo(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.531
_cell_length_b   6.935
_cell_length_c   9.374
_cell_angle_alpha   110.826
_cell_angle_beta   101.194
_cell_angle_gamma   98.535
_symmetry_Int_Tables_number   1
_cell_volume   320.295
_cell_formula_units_Z   2
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
  Co  Co0  1  0.637  0.852  0.563  1.0
  Co  Co1  1  0.363  0.148  0.437  1.0
  Mg  Mg2  1  0.989  0.391  0.655  1.0
  Mg  Mg3  1  0.011  0.609  0.345  1.0
  O  O4  1  0.829  0.546  0.879  1.0
  O  O5  1  0.170  0.454  0.122  1.0
  O  O6  1  0.653  0.475  0.203  1.0
  O  O7  1  0.346  0.525  0.797  1.0
  O  O8  1  0.662  0.800  0.766  1.0
  O  O9  1  0.337  0.200  0.234  1.0
  O  O10  1  0.957  0.113  0.690  1.0
  O  O11  1  0.043  0.887  0.310  1.0
  O  O12  1  0.009  0.742  0.577  1.0
  O  O13  1  0.991  0.258  0.423  1.0
  O  O14  1  0.255  0.997  0.867  1.0
  O  O15  1  0.745  0.003  0.133  1.0
  O  O16  1  0.383  0.591  0.401  1.0
  O  O17  1  0.617  0.409  0.599  1.0
  O  O18  1  0.617  0.951  0.365  1.0
  O  O19  1  0.383  0.049  0.635  1.0
  P  P20  1  0.393  0.427  0.238  1.0
  P  P21  1  0.607  0.573  0.762  1.0
  P  P22  1  0.843  0.027  0.304  1.0
  P  P23  1  0.158  0.973  0.696  1.0
  Sr  Sr24  1  0.254  0.803  0.053  1.0
  Sr  Sr25  1  0.746  0.197  0.947  1.0
[/CIF]
.
The compound described by SrMgCo(PO4)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(15), one O(4), one O(6), one O(7), two equivalent O(1), and two equivalent O(12) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(16), one O(3), one O(5), one O(8), two equivalent O(11), and two equivalent O(2) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(4), one O(7), and one O(9) atom. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to one O(10), one O(14), one O(2), one O(3), one O(8), and one O(9) atom. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(13), one O(15), one O(16), one O(5), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one P(4)O4 tetrahedra. In the second Co site, Co(2) is bonded to one O(14), one O(15), one O(16), one O(6), one O(7), and one O(9) atom to form distorted CoO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(13), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the second P site, P(2) is bonded to one O(14), one O(2), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-58°. In the third P site, P(3) is bonded to one O(11), one O(16), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-59°. In the fourth P site, P(4) is bonded to one O(10), one O(12), one O(15), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-59°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Mg(1), and one P(1) atom to form distorted edge-sharing OSr2MgP trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Sr(2), one Mg(2), and one P(2) atom to form distorted edge-sharing OSr2MgP trigonal pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(2), one Co(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Co(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one Co(2), and one P(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Mg(2), one Co(1), and one P(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Mg(1), one Mg(2), one Co(2), and one P(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Mg(2), one Co(1), and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to two equivalent Sr(2) and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mg(1), one Co(1), and one P(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Mg(2), one Co(2), and one P(2) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Sr(1), one Co(1), one Co(2), and one P(4) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Sr(2), one Co(1), one Co(2), and one P(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrMgCo(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.531
_cell_length_b   6.935
_cell_length_c   9.374
_cell_angle_alpha   110.826
_cell_angle_beta   101.194
_cell_angle_gamma   98.535
_symmetry_Int_Tables_number   1
_cell_volume   320.295
_cell_formula_units_Z   2
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
  Co  Co0  1  0.637  0.852  0.563  1.0
  Co  Co1  1  0.363  0.148  0.437  1.0
  Mg  Mg2  1  0.989  0.391  0.655  1.0
  Mg  Mg3  1  0.011  0.609  0.345  1.0
  O  O4  1  0.829  0.546  0.879  1.0
  O  O5  1  0.170  0.454  0.122  1.0
  O  O6  1  0.653  0.475  0.203  1.0
  O  O7  1  0.346  0.525  0.797  1.0
  O  O8  1  0.662  0.800  0.766  1.0
  O  O9  1  0.337  0.200  0.234  1.0
  O  O10  1  0.957  0.113  0.690  1.0
  O  O11  1  0.043  0.887  0.310  1.0
  O  O12  1  0.009  0.742  0.577  1.0
  O  O13  1  0.991  0.258  0.423  1.0
  O  O14  1  0.255  0.997  0.867  1.0
  O  O15  1  0.745  0.003  0.133  1.0
  O  O16  1  0.383  0.591  0.401  1.0
  O  O17  1  0.617  0.409  0.599  1.0
  O  O18  1  0.617  0.951  0.365  1.0
  O  O19  1  0.383  0.049  0.635  1.0
  P  P20  1  0.393  0.427  0.238  1.0
  P  P21  1  0.607  0.573  0.762  1.0
  P  P22  1  0.843  0.027  0.304  1.0
  P  P23  1  0.158  0.973  0.696  1.0
  Sr  Sr24  1  0.254  0.803  0.053  1.0
  Sr  Sr25  1  0.746  0.197  0.947  1.0
[/CIF]
.