The crystal structure described by SrCaPbO4 crystallizes in the monoclinic P2/m space group. Sr(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Ca(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form edge-sharing PbO6 octahedra. In the second Pb site, Pb(2) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form edge-sharing PbO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Ca(1), and one Pb(2) atom to form distorted OSr2Ca2Pb trigonal bipyramids that share corners with four equivalent O(2)Sr2Ca2Pb square pyramids,  a cornercorner with one O(1)Sr2Ca2Pb trigonal bipyramid, corners with two equivalent O(4)Sr2CaPb2 trigonal bipyramids, corners with two equivalent O(3)SrCa2Pb2 trigonal bipyramids, edges with two equivalent O(2)Sr2Ca2Pb square pyramids, edges with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(3)SrCa2Pb2 trigonal bipyramids, and edges with four equivalent O(4)Sr2CaPb2 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Ca(1), and one Pb(1) atom to form distorted OSr2Ca2Pb square pyramids that share  a cornercorner with one O(2)Sr2Ca2Pb square pyramid, corners with two equivalent O(4)Sr2CaPb2 trigonal bipyramids, corners with two equivalent O(3)SrCa2Pb2 trigonal bipyramids, corners with four equivalent O(1)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(2)Sr2Ca2Pb square pyramids, edges with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(4)Sr2CaPb2 trigonal bipyramids, and edges with four equivalent O(3)SrCa2Pb2 trigonal bipyramids. In the third O site, O(3) is bonded to one Sr(1), two equivalent Ca(1), and two equivalent Pb(1) atoms to form OSrCa2Pb2 trigonal bipyramids that share corners with two equivalent O(2)Sr2Ca2Pb square pyramids, corners with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, corners with four equivalent O(4)Sr2CaPb2 trigonal bipyramids, corners with four equivalent O(3)SrCa2Pb2 trigonal bipyramids, edges with four equivalent O(2)Sr2Ca2Pb square pyramids, edges with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(3)SrCa2Pb2 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Sr(1), one Ca(1), and two equivalent Pb(2) atoms to form distorted OSr2CaPb2 trigonal bipyramids that share corners with two equivalent O(2)Sr2Ca2Pb square pyramids, corners with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, corners with four equivalent O(4)Sr2CaPb2 trigonal bipyramids, corners with four equivalent O(3)SrCa2Pb2 trigonal bipyramids, edges with two equivalent O(2)Sr2Ca2Pb square pyramids, edges with two equivalent O(4)Sr2CaPb2 trigonal bipyramids, and edges with four equivalent O(1)Sr2Ca2Pb trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrCaPbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.487
_cell_length_b   6.066
_cell_length_c   10.087
_cell_angle_alpha   89.597
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   213.342
_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
  Sr  Sr0  1  0.500  0.424  0.185  1.0
  Sr  Sr1  1  0.500  0.576  0.815  1.0
  Ca  Ca2  1  0.500  0.926  0.321  1.0
  Ca  Ca3  1  0.500  0.074  0.679  1.0
  Pb  Pb4  1  0.000  0.500  0.500  1.0
  Pb  Pb5  1  0.000  0.000  0.000  1.0
  O  O6  1  0.000  0.122  0.202  1.0
  O  O7  1  0.000  0.878  0.798  1.0
  O  O8  1  0.000  0.649  0.306  1.0
  O  O9  1  0.000  0.351  0.694  1.0
  O  O10  1  0.500  0.264  0.450  1.0
  O  O11  1  0.500  0.736  0.550  1.0
  O  O12  1  0.500  0.769  0.048  1.0
  O  O13  1  0.500  0.231  0.952  1.0
[/CIF]
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The crystal structure described by SrCaPbO4 crystallizes in the monoclinic P2/m space group. Sr(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Ca(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form edge-sharing PbO6 octahedra. In the second Pb site, Pb(2) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form edge-sharing PbO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Ca(1), and one Pb(2) atom to form distorted OSr2Ca2Pb trigonal bipyramids that share corners with four equivalent O(2)Sr2Ca2Pb square pyramids,  a cornercorner with one O(1)Sr2Ca2Pb trigonal bipyramid, corners with two equivalent O(4)Sr2CaPb2 trigonal bipyramids, corners with two equivalent O(3)SrCa2Pb2 trigonal bipyramids, edges with two equivalent O(2)Sr2Ca2Pb square pyramids, edges with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(3)SrCa2Pb2 trigonal bipyramids, and edges with four equivalent O(4)Sr2CaPb2 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Ca(1), and one Pb(1) atom to form distorted OSr2Ca2Pb square pyramids that share  a cornercorner with one O(2)Sr2Ca2Pb square pyramid, corners with two equivalent O(4)Sr2CaPb2 trigonal bipyramids, corners with two equivalent O(3)SrCa2Pb2 trigonal bipyramids, corners with four equivalent O(1)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(2)Sr2Ca2Pb square pyramids, edges with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(4)Sr2CaPb2 trigonal bipyramids, and edges with four equivalent O(3)SrCa2Pb2 trigonal bipyramids. In the third O site, O(3) is bonded to one Sr(1), two equivalent Ca(1), and two equivalent Pb(1) atoms to form OSrCa2Pb2 trigonal bipyramids that share corners with two equivalent O(2)Sr2Ca2Pb square pyramids, corners with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, corners with four equivalent O(4)Sr2CaPb2 trigonal bipyramids, corners with four equivalent O(3)SrCa2Pb2 trigonal bipyramids, edges with four equivalent O(2)Sr2Ca2Pb square pyramids, edges with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(3)SrCa2Pb2 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Sr(1), one Ca(1), and two equivalent Pb(2) atoms to form distorted OSr2CaPb2 trigonal bipyramids that share corners with two equivalent O(2)Sr2Ca2Pb square pyramids, corners with two equivalent O(1)Sr2Ca2Pb trigonal bipyramids, corners with four equivalent O(4)Sr2CaPb2 trigonal bipyramids, corners with four equivalent O(3)SrCa2Pb2 trigonal bipyramids, edges with two equivalent O(2)Sr2Ca2Pb square pyramids, edges with two equivalent O(4)Sr2CaPb2 trigonal bipyramids, and edges with four equivalent O(1)Sr2Ca2Pb trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrCaPbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.487
_cell_length_b   6.066
_cell_length_c   10.087
_cell_angle_alpha   89.597
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   213.342
_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
  Sr  Sr0  1  0.500  0.424  0.185  1.0
  Sr  Sr1  1  0.500  0.576  0.815  1.0
  Ca  Ca2  1  0.500  0.926  0.321  1.0
  Ca  Ca3  1  0.500  0.074  0.679  1.0
  Pb  Pb4  1  0.000  0.500  0.500  1.0
  Pb  Pb5  1  0.000  0.000  0.000  1.0
  O  O6  1  0.000  0.122  0.202  1.0
  O  O7  1  0.000  0.878  0.798  1.0
  O  O8  1  0.000  0.649  0.306  1.0
  O  O9  1  0.000  0.351  0.694  1.0
  O  O10  1  0.500  0.264  0.450  1.0
  O  O11  1  0.500  0.736  0.550  1.0
  O  O12  1  0.500  0.769  0.048  1.0
  O  O13  1  0.500  0.231  0.952  1.0
[/CIF]
.