The structure described by SrCaCu(PO4)2 is Esseneite-derived structured and crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(8), two equivalent O(1), and two equivalent O(6) atoms. Ca(1) is bonded to one O(1), one O(2), one O(4), one O(7), and two equivalent O(5) atoms to form distorted CaO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Ca(1)O6 octahedra, and  an edgeedge with one P(1)O4 tetrahedra. Cu(1) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(5), one O(7), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Ca(1)O6 octahedra and  an edgeedge with one Ca(1)O6 octahedra. The corner-sharing octahedral tilt angles are 56°. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Ca(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-57°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Ca(1), and one P(1) atom to form distorted edge-sharing OSr2CaP trigonal pyramids. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Ca(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Cu(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Cu(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Cu(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ca(1), one Cu(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Sr(1), one Cu(1), and one P(2) atom. is represented by the CIF card [CIF]
data_SrCaCu(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.926
_cell_length_b   6.915
_cell_length_c   9.328
_cell_angle_alpha   108.659
_cell_angle_beta   102.555
_cell_angle_gamma   99.822
_symmetry_Int_Tables_number   1
_cell_volume   341.382
_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  0.275  0.813  0.065  1.0
  Sr  Sr1  1  0.725  0.187  0.935  1.0
  Ca  Ca2  1  0.993  0.416  0.661  1.0
  Ca  Ca3  1  0.007  0.584  0.339  1.0
  Cu  Cu4  1  0.660  0.844  0.546  1.0
  Cu  Cu5  1  0.340  0.156  0.454  1.0
  P  P6  1  0.396  0.420  0.232  1.0
  P  P7  1  0.604  0.580  0.768  1.0
  P  P8  1  0.841  0.031  0.296  1.0
  P  P9  1  0.159  0.969  0.704  1.0
  O  O10  1  0.834  0.562  0.879  1.0
  O  O11  1  0.618  0.454  0.175  1.0
  O  O12  1  0.650  0.798  0.748  1.0
  O  O13  1  0.950  0.085  0.690  1.0
  O  O14  1  0.382  0.546  0.825  1.0
  O  O15  1  0.042  0.731  0.602  1.0
  O  O16  1  0.958  0.269  0.398  1.0
  O  O17  1  0.276  0.009  0.877  1.0
  O  O18  1  0.350  0.202  0.252  1.0
  O  O19  1  0.724  0.991  0.123  1.0
  O  O20  1  0.166  0.438  0.121  1.0
  O  O21  1  0.419  0.593  0.396  1.0
  O  O22  1  0.581  0.407  0.604  1.0
  O  O23  1  0.646  0.940  0.364  1.0
  O  O24  1  0.050  0.915  0.310  1.0
  O  O25  1  0.354  0.060  0.636  1.0
[/CIF]
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The structure described by SrCaCu(PO4)2 is Esseneite-derived structured and crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(8), two equivalent O(1), and two equivalent O(6) atoms. Ca(1) is bonded to one O(1), one O(2), one O(4), one O(7), and two equivalent O(5) atoms to form distorted CaO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Ca(1)O6 octahedra, and  an edgeedge with one P(1)O4 tetrahedra. Cu(1) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(5), one O(7), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Ca(1)O6 octahedra and  an edgeedge with one Ca(1)O6 octahedra. The corner-sharing octahedral tilt angles are 56°. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Ca(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-57°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Ca(1), and one P(1) atom to form distorted edge-sharing OSr2CaP trigonal pyramids. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Ca(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Cu(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Cu(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Cu(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ca(1), one Cu(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Sr(1), one Cu(1), and one P(2) atom. is represented by the CIF card [CIF]
data_SrCaCu(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.926
_cell_length_b   6.915
_cell_length_c   9.328
_cell_angle_alpha   108.659
_cell_angle_beta   102.555
_cell_angle_gamma   99.822
_symmetry_Int_Tables_number   1
_cell_volume   341.382
_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  0.275  0.813  0.065  1.0
  Sr  Sr1  1  0.725  0.187  0.935  1.0
  Ca  Ca2  1  0.993  0.416  0.661  1.0
  Ca  Ca3  1  0.007  0.584  0.339  1.0
  Cu  Cu4  1  0.660  0.844  0.546  1.0
  Cu  Cu5  1  0.340  0.156  0.454  1.0
  P  P6  1  0.396  0.420  0.232  1.0
  P  P7  1  0.604  0.580  0.768  1.0
  P  P8  1  0.841  0.031  0.296  1.0
  P  P9  1  0.159  0.969  0.704  1.0
  O  O10  1  0.834  0.562  0.879  1.0
  O  O11  1  0.618  0.454  0.175  1.0
  O  O12  1  0.650  0.798  0.748  1.0
  O  O13  1  0.950  0.085  0.690  1.0
  O  O14  1  0.382  0.546  0.825  1.0
  O  O15  1  0.042  0.731  0.602  1.0
  O  O16  1  0.958  0.269  0.398  1.0
  O  O17  1  0.276  0.009  0.877  1.0
  O  O18  1  0.350  0.202  0.252  1.0
  O  O19  1  0.724  0.991  0.123  1.0
  O  O20  1  0.166  0.438  0.121  1.0
  O  O21  1  0.419  0.593  0.396  1.0
  O  O22  1  0.581  0.407  0.604  1.0
  O  O23  1  0.646  0.940  0.364  1.0
  O  O24  1  0.050  0.915  0.310  1.0
  O  O25  1  0.354  0.060  0.636  1.0
[/CIF]
.