The compound described by RbFeCu(PO4)2 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(6), one O(7), two equivalent O(2), and two equivalent O(5) atoms. Fe(1) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and corners with two equivalent Cu(1)O5 trigonal bipyramids. Cu(1) is bonded to one O(5), one O(7), one O(8), and two equivalent O(1) atoms to form distorted CuO5 trigonal bipyramids that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra,  an edgeedge with one P(2)O4 tetrahedra, and  an edgeedge with one Cu(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 51-61°. 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(4) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra and corners with two equivalent Cu(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 36-38°. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra,  a cornercorner with one Cu(1)O5 trigonal bipyramid, and  an edgeedge with one Cu(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 38-43°. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Fe(1), and one P(1) atom. In the second O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Cu(1), and one P(2) atom. In the third O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Fe(1), and one P(2) atom. In the fourth O site, O(7) is bonded in a 3-coordinate geometry to one Rb(1), one Fe(1), one Cu(1), and one P(2) atom. In the fifth O site, O(8) is bonded in a 3-coordinate geometry to one Fe(1), one Cu(1), and one P(2) atom. In the sixth O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), two equivalent Cu(1), and one P(1) atom. In the seventh O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Fe(1), and one P(1) atom. In the eighth O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Fe(1), and one P(1) atom. is represented by the CIF card [CIF]
data_RbFeCu(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.051
_cell_length_b   8.268
_cell_length_c   9.334
_cell_angle_alpha   63.222
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   692.492
_cell_formula_units_Z   4
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
  Rb  Rb0  1  0.134  0.842  0.576  1.0
  Rb  Rb1  1  0.366  0.842  0.076  1.0
  Rb  Rb2  1  0.866  0.158  0.424  1.0
  Rb  Rb3  1  0.634  0.158  0.924  1.0
  Fe  Fe4  1  0.624  0.773  0.745  1.0
  Fe  Fe5  1  0.876  0.773  0.245  1.0
  Fe  Fe6  1  0.376  0.227  0.255  1.0
  Fe  Fe7  1  0.124  0.227  0.755  1.0
  Cu  Cu8  1  0.382  0.574  0.559  1.0
  Cu  Cu9  1  0.118  0.574  0.059  1.0
  Cu  Cu10  1  0.618  0.426  0.441  1.0
  Cu  Cu11  1  0.882  0.426  0.941  1.0
  P  P12  1  0.589  0.878  0.359  1.0
  P  P13  1  0.911  0.878  0.859  1.0
  P  P14  1  0.411  0.122  0.641  1.0
  P  P15  1  0.089  0.122  0.141  1.0
  P  P16  1  0.341  0.506  0.862  1.0
  P  P17  1  0.159  0.506  0.362  1.0
  P  P18  1  0.659  0.494  0.138  1.0
  P  P19  1  0.841  0.494  0.638  1.0
  O  O20  1  0.522  0.690  0.404  1.0
  O  O21  1  0.978  0.690  0.904  1.0
  O  O22  1  0.478  0.310  0.596  1.0
  O  O23  1  0.022  0.310  0.096  1.0
  O  O24  1  0.491  0.030  0.255  1.0
  O  O25  1  0.009  0.030  0.755  1.0
  O  O26  1  0.509  0.970  0.745  1.0
  O  O27  1  0.991  0.970  0.245  1.0
  O  O28  1  0.790  0.897  0.751  1.0
  O  O29  1  0.710  0.897  0.251  1.0
  O  O30  1  0.210  0.103  0.249  1.0
  O  O31  1  0.290  0.103  0.749  1.0
  O  O32  1  0.632  0.893  0.511  1.0
  O  O33  1  0.868  0.893  0.011  1.0
  O  O34  1  0.368  0.107  0.489  1.0
  O  O35  1  0.132  0.107  0.989  1.0
  O  O36  1  0.239  0.641  0.399  1.0
  O  O37  1  0.261  0.641  0.899  1.0
  O  O38  1  0.761  0.359  0.601  1.0
  O  O39  1  0.739  0.359  0.101  1.0
  O  O40  1  0.389  0.342  0.013  1.0
  O  O41  1  0.111  0.342  0.513  1.0
  O  O42  1  0.611  0.658  0.987  1.0
  O  O43  1  0.889  0.658  0.487  1.0
  O  O44  1  0.258  0.450  0.747  1.0
  O  O45  1  0.242  0.450  0.247  1.0
  O  O46  1  0.742  0.550  0.253  1.0
  O  O47  1  0.758  0.550  0.753  1.0
  O  O48  1  0.462  0.606  0.747  1.0
  O  O49  1  0.038  0.606  0.247  1.0
  O  O50  1  0.538  0.394  0.253  1.0
  O  O51  1  0.962  0.394  0.753  1.0
[/CIF]
.
The compound described by RbFeCu(PO4)2 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(6), one O(7), two equivalent O(2), and two equivalent O(5) atoms. Fe(1) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and corners with two equivalent Cu(1)O5 trigonal bipyramids. Cu(1) is bonded to one O(5), one O(7), one O(8), and two equivalent O(1) atoms to form distorted CuO5 trigonal bipyramids that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra,  an edgeedge with one P(2)O4 tetrahedra, and  an edgeedge with one Cu(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 51-61°. 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(4) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra and corners with two equivalent Cu(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 36-38°. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra,  a cornercorner with one Cu(1)O5 trigonal bipyramid, and  an edgeedge with one Cu(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 38-43°. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Fe(1), and one P(1) atom. In the second O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Cu(1), and one P(2) atom. In the third O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Fe(1), and one P(2) atom. In the fourth O site, O(7) is bonded in a 3-coordinate geometry to one Rb(1), one Fe(1), one Cu(1), and one P(2) atom. In the fifth O site, O(8) is bonded in a 3-coordinate geometry to one Fe(1), one Cu(1), and one P(2) atom. In the sixth O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), two equivalent Cu(1), and one P(1) atom. In the seventh O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Fe(1), and one P(1) atom. In the eighth O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Fe(1), and one P(1) atom. is represented by the CIF card [CIF]
data_RbFeCu(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.051
_cell_length_b   8.268
_cell_length_c   9.334
_cell_angle_alpha   63.222
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   692.492
_cell_formula_units_Z   4
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
  Rb  Rb0  1  0.134  0.842  0.576  1.0
  Rb  Rb1  1  0.366  0.842  0.076  1.0
  Rb  Rb2  1  0.866  0.158  0.424  1.0
  Rb  Rb3  1  0.634  0.158  0.924  1.0
  Fe  Fe4  1  0.624  0.773  0.745  1.0
  Fe  Fe5  1  0.876  0.773  0.245  1.0
  Fe  Fe6  1  0.376  0.227  0.255  1.0
  Fe  Fe7  1  0.124  0.227  0.755  1.0
  Cu  Cu8  1  0.382  0.574  0.559  1.0
  Cu  Cu9  1  0.118  0.574  0.059  1.0
  Cu  Cu10  1  0.618  0.426  0.441  1.0
  Cu  Cu11  1  0.882  0.426  0.941  1.0
  P  P12  1  0.589  0.878  0.359  1.0
  P  P13  1  0.911  0.878  0.859  1.0
  P  P14  1  0.411  0.122  0.641  1.0
  P  P15  1  0.089  0.122  0.141  1.0
  P  P16  1  0.341  0.506  0.862  1.0
  P  P17  1  0.159  0.506  0.362  1.0
  P  P18  1  0.659  0.494  0.138  1.0
  P  P19  1  0.841  0.494  0.638  1.0
  O  O20  1  0.522  0.690  0.404  1.0
  O  O21  1  0.978  0.690  0.904  1.0
  O  O22  1  0.478  0.310  0.596  1.0
  O  O23  1  0.022  0.310  0.096  1.0
  O  O24  1  0.491  0.030  0.255  1.0
  O  O25  1  0.009  0.030  0.755  1.0
  O  O26  1  0.509  0.970  0.745  1.0
  O  O27  1  0.991  0.970  0.245  1.0
  O  O28  1  0.790  0.897  0.751  1.0
  O  O29  1  0.710  0.897  0.251  1.0
  O  O30  1  0.210  0.103  0.249  1.0
  O  O31  1  0.290  0.103  0.749  1.0
  O  O32  1  0.632  0.893  0.511  1.0
  O  O33  1  0.868  0.893  0.011  1.0
  O  O34  1  0.368  0.107  0.489  1.0
  O  O35  1  0.132  0.107  0.989  1.0
  O  O36  1  0.239  0.641  0.399  1.0
  O  O37  1  0.261  0.641  0.899  1.0
  O  O38  1  0.761  0.359  0.601  1.0
  O  O39  1  0.739  0.359  0.101  1.0
  O  O40  1  0.389  0.342  0.013  1.0
  O  O41  1  0.111  0.342  0.513  1.0
  O  O42  1  0.611  0.658  0.987  1.0
  O  O43  1  0.889  0.658  0.487  1.0
  O  O44  1  0.258  0.450  0.747  1.0
  O  O45  1  0.242  0.450  0.247  1.0
  O  O46  1  0.742  0.550  0.253  1.0
  O  O47  1  0.758  0.550  0.753  1.0
  O  O48  1  0.462  0.606  0.747  1.0
  O  O49  1  0.038  0.606  0.247  1.0
  O  O50  1  0.538  0.394  0.253  1.0
  O  O51  1  0.962  0.394  0.753  1.0
[/CIF]
.