The crystal structure described by La5Cu19P12 crystallizes in the hexagonal P-62m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 16-coordinate geometry to two equivalent Cu(2), two equivalent Cu(4), two equivalent Cu(5), four equivalent Cu(1), two equivalent P(2), and four equivalent P(3) atoms. In the second La site, La(2) is bonded in a 15-coordinate geometry to three equivalent Cu(1), six equivalent Cu(2), and six equivalent P(1) atoms. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one La(2), two equivalent La(1), one P(2), one P(3), and two equivalent P(1) atoms to form distorted CuLa3P4 tetrahedra that share corners with two equivalent Cu(4)La2P4 tetrahedra, corners with two equivalent Cu(2)La3P4 tetrahedra, corners with five equivalent Cu(1)La3P4 tetrahedra, edges with two equivalent Cu(1)La3P4 tetrahedra, edges with four equivalent Cu(2)La3P4 tetrahedra,  a faceface with one Cu(1)La3P4 tetrahedra, faces with two equivalent Cu(4)La2P4 tetrahedra, and faces with two equivalent Cu(2)La3P4 tetrahedra. In the second Cu site, Cu(2) is bonded to one La(1), two equivalent La(2), two equivalent P(1), and two equivalent P(2) atoms to form distorted CuLa3P4 tetrahedra that share corners with two equivalent Cu(4)La2P4 tetrahedra, corners with two equivalent Cu(1)La3P4 tetrahedra, corners with six equivalent Cu(2)La3P4 tetrahedra,  an edgeedge with one Cu(4)La2P4 tetrahedra, edges with two equivalent Cu(2)La3P4 tetrahedra, edges with four equivalent Cu(1)La3P4 tetrahedra, faces with two equivalent Cu(1)La3P4 tetrahedra, and faces with three equivalent Cu(2)La3P4 tetrahedra. In the third Cu site, Cu(3) is bonded in a distorted single-bond geometry to one P(2) and four equivalent P(1) atoms. In the fourth Cu site, Cu(4) is bonded to two equivalent La(1), two equivalent P(1), and two equivalent P(3) atoms to form distorted CuLa2P4 tetrahedra that share corners with four equivalent Cu(4)La2P4 tetrahedra, corners with four equivalent Cu(1)La3P4 tetrahedra, corners with four equivalent Cu(2)La3P4 tetrahedra, edges with two equivalent Cu(2)La3P4 tetrahedra, and faces with four equivalent Cu(1)La3P4 tetrahedra. In the fifth Cu site, Cu(5) is bonded in a distorted trigonal planar geometry to six equivalent La(1) and three equivalent P(3) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent La(2), one Cu(4), two equivalent Cu(1), two equivalent Cu(2), and two equivalent Cu(3) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent La(1), one Cu(3), two equivalent Cu(1), and four equivalent Cu(2) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to four equivalent La(1), one Cu(5), two equivalent Cu(1), and two equivalent Cu(4) atoms. is represented by the CIF file [CIF]
data_La5Cu19P12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.728
_cell_length_b   12.728
_cell_length_c   3.979
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   558.273
_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
  La  La0  1  0.807  0.000  0.500  1.0
  La  La1  1  0.000  0.807  0.500  1.0
  La  La2  1  0.193  0.193  0.500  1.0
  La  La3  1  0.333  0.667  0.000  1.0
  La  La4  1  0.667  0.333  0.000  1.0
  Cu  Cu5  1  0.828  0.207  0.000  1.0
  Cu  Cu6  1  0.621  0.793  0.000  1.0
  Cu  Cu7  1  0.172  0.379  0.000  1.0
  Cu  Cu8  1  0.207  0.828  0.000  1.0
  Cu  Cu9  1  0.483  0.366  0.500  1.0
  Cu  Cu10  1  0.882  0.517  0.500  1.0
  Cu  Cu11  1  0.517  0.882  0.500  1.0
  Cu  Cu12  1  0.366  0.483  0.500  1.0
  Cu  Cu13  1  0.118  0.634  0.500  1.0
  Cu  Cu14  1  0.550  0.550  0.000  1.0
  Cu  Cu15  1  0.000  0.450  0.000  1.0
  Cu  Cu16  1  0.450  0.000  0.000  1.0
  Cu  Cu17  1  0.379  0.172  0.000  1.0
  Cu  Cu18  1  0.289  0.000  0.500  1.0
  Cu  Cu19  1  0.000  0.289  0.500  1.0
  Cu  Cu20  1  0.711  0.711  0.500  1.0
  Cu  Cu21  1  0.000  0.000  0.000  1.0
  Cu  Cu22  1  0.634  0.118  0.500  1.0
  Cu  Cu23  1  0.793  0.621  0.000  1.0
  P  P24  1  0.173  0.480  0.500  1.0
  P  P25  1  0.520  0.693  0.500  1.0
  P  P26  1  0.307  0.827  0.500  1.0
  P  P27  1  0.827  0.307  0.500  1.0
  P  P28  1  0.693  0.520  0.500  1.0
  P  P29  1  0.000  0.631  0.000  1.0
  P  P30  1  0.369  0.369  0.000  1.0
  P  P31  1  0.177  0.000  0.000  1.0
  P  P32  1  0.000  0.177  0.000  1.0
  P  P33  1  0.823  0.823  0.000  1.0
  P  P34  1  0.480  0.173  0.500  1.0
  P  P35  1  0.631  0.000  0.000  1.0
[/CIF]
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The crystal structure described by La5Cu19P12 crystallizes in the hexagonal P-62m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 16-coordinate geometry to two equivalent Cu(2), two equivalent Cu(4), two equivalent Cu(5), four equivalent Cu(1), two equivalent P(2), and four equivalent P(3) atoms. In the second La site, La(2) is bonded in a 15-coordinate geometry to three equivalent Cu(1), six equivalent Cu(2), and six equivalent P(1) atoms. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one La(2), two equivalent La(1), one P(2), one P(3), and two equivalent P(1) atoms to form distorted CuLa3P4 tetrahedra that share corners with two equivalent Cu(4)La2P4 tetrahedra, corners with two equivalent Cu(2)La3P4 tetrahedra, corners with five equivalent Cu(1)La3P4 tetrahedra, edges with two equivalent Cu(1)La3P4 tetrahedra, edges with four equivalent Cu(2)La3P4 tetrahedra,  a faceface with one Cu(1)La3P4 tetrahedra, faces with two equivalent Cu(4)La2P4 tetrahedra, and faces with two equivalent Cu(2)La3P4 tetrahedra. In the second Cu site, Cu(2) is bonded to one La(1), two equivalent La(2), two equivalent P(1), and two equivalent P(2) atoms to form distorted CuLa3P4 tetrahedra that share corners with two equivalent Cu(4)La2P4 tetrahedra, corners with two equivalent Cu(1)La3P4 tetrahedra, corners with six equivalent Cu(2)La3P4 tetrahedra,  an edgeedge with one Cu(4)La2P4 tetrahedra, edges with two equivalent Cu(2)La3P4 tetrahedra, edges with four equivalent Cu(1)La3P4 tetrahedra, faces with two equivalent Cu(1)La3P4 tetrahedra, and faces with three equivalent Cu(2)La3P4 tetrahedra. In the third Cu site, Cu(3) is bonded in a distorted single-bond geometry to one P(2) and four equivalent P(1) atoms. In the fourth Cu site, Cu(4) is bonded to two equivalent La(1), two equivalent P(1), and two equivalent P(3) atoms to form distorted CuLa2P4 tetrahedra that share corners with four equivalent Cu(4)La2P4 tetrahedra, corners with four equivalent Cu(1)La3P4 tetrahedra, corners with four equivalent Cu(2)La3P4 tetrahedra, edges with two equivalent Cu(2)La3P4 tetrahedra, and faces with four equivalent Cu(1)La3P4 tetrahedra. In the fifth Cu site, Cu(5) is bonded in a distorted trigonal planar geometry to six equivalent La(1) and three equivalent P(3) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent La(2), one Cu(4), two equivalent Cu(1), two equivalent Cu(2), and two equivalent Cu(3) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent La(1), one Cu(3), two equivalent Cu(1), and four equivalent Cu(2) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to four equivalent La(1), one Cu(5), two equivalent Cu(1), and two equivalent Cu(4) atoms. is represented by the CIF file [CIF]
data_La5Cu19P12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.728
_cell_length_b   12.728
_cell_length_c   3.979
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   558.273
_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
  La  La0  1  0.807  0.000  0.500  1.0
  La  La1  1  0.000  0.807  0.500  1.0
  La  La2  1  0.193  0.193  0.500  1.0
  La  La3  1  0.333  0.667  0.000  1.0
  La  La4  1  0.667  0.333  0.000  1.0
  Cu  Cu5  1  0.828  0.207  0.000  1.0
  Cu  Cu6  1  0.621  0.793  0.000  1.0
  Cu  Cu7  1  0.172  0.379  0.000  1.0
  Cu  Cu8  1  0.207  0.828  0.000  1.0
  Cu  Cu9  1  0.483  0.366  0.500  1.0
  Cu  Cu10  1  0.882  0.517  0.500  1.0
  Cu  Cu11  1  0.517  0.882  0.500  1.0
  Cu  Cu12  1  0.366  0.483  0.500  1.0
  Cu  Cu13  1  0.118  0.634  0.500  1.0
  Cu  Cu14  1  0.550  0.550  0.000  1.0
  Cu  Cu15  1  0.000  0.450  0.000  1.0
  Cu  Cu16  1  0.450  0.000  0.000  1.0
  Cu  Cu17  1  0.379  0.172  0.000  1.0
  Cu  Cu18  1  0.289  0.000  0.500  1.0
  Cu  Cu19  1  0.000  0.289  0.500  1.0
  Cu  Cu20  1  0.711  0.711  0.500  1.0
  Cu  Cu21  1  0.000  0.000  0.000  1.0
  Cu  Cu22  1  0.634  0.118  0.500  1.0
  Cu  Cu23  1  0.793  0.621  0.000  1.0
  P  P24  1  0.173  0.480  0.500  1.0
  P  P25  1  0.520  0.693  0.500  1.0
  P  P26  1  0.307  0.827  0.500  1.0
  P  P27  1  0.827  0.307  0.500  1.0
  P  P28  1  0.693  0.520  0.500  1.0
  P  P29  1  0.000  0.631  0.000  1.0
  P  P30  1  0.369  0.369  0.000  1.0
  P  P31  1  0.177  0.000  0.000  1.0
  P  P32  1  0.000  0.177  0.000  1.0
  P  P33  1  0.823  0.823  0.000  1.0
  P  P34  1  0.480  0.173  0.500  1.0
  P  P35  1  0.631  0.000  0.000  1.0
[/CIF]
.