The material described by Li3Cr4PO19 crystallizes in the monoclinic Cm space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(11), one O(2), and two equivalent O(7) atoms to form LiO4 trigonal pyramids that share  a cornercorner with one Cr(1)O4 tetrahedra and corners with two equivalent Cr(2)O4 tetrahedra. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(12), and one O(6) atom. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and  a cornercorner with one Li(1)O4 trigonal pyramid. In the second Cr site, Cr(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and  a cornercorner with one Li(1)O4 trigonal pyramid. In the third Cr site, Cr(3) is bonded to one O(4), one O(9), and two equivalent O(10) atoms to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. P(1) is bonded to one O(3), one O(4), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Cr(3)O4 tetrahedra, and corners with two equivalent Cr(2)O4 tetrahedra. There are twelve inequivalent O sites. In the first O site, O(11) is bonded in a single-bond geometry to one Li(1) atom. In the second O site, O(12) is bonded in a single-bond geometry to one Li(2) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one Li(2) and one Cr(1) atom. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to one Li(1) and one Cr(1) atom. In the fifth O site, O(3) is bonded in a linear geometry to one Cr(1) and one P(1) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one Cr(3) and one P(1) atom. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(2) and one P(1) atom. In the eighth O site, O(6) is bonded in a bent 120 degrees geometry to one Li(2) and one Cr(2) atom. In the ninth O site, O(7) is bonded in a bent 150 degrees geometry to one Li(1) and one Cr(2) atom. In the tenth O site, O(8) is bonded in a single-bond geometry to one Cr(2) atom. In the eleventh O site, O(9) is bonded in a single-bond geometry to one Cr(3) atom. In the twelfth O site, O(10) is bonded in a bent 150 degrees geometry to one Li(2) and one Cr(3) atom. is represented by the CIF card [CIF]
data_Li3Cr4PO19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.940
_cell_length_b   7.940
_cell_length_c   7.769
_cell_angle_alpha   77.763
_cell_angle_beta   77.763
_cell_angle_gamma   102.768
_symmetry_Int_Tables_number   1
_cell_volume   449.309
_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
  Li  Li0  1  0.955  0.955  0.545  1.0
  Li  Li1  1  0.357  0.857  0.880  1.0
  Li  Li2  1  0.857  0.357  0.880  1.0
  Cr  Cr3  1  0.167  0.167  0.834  1.0
  Cr  Cr4  1  0.533  0.920  0.460  1.0
  Cr  Cr5  1  0.920  0.533  0.460  1.0
  Cr  Cr6  1  0.527  0.527  0.069  1.0
  P  P7  1  0.490  0.490  0.507  1.0
  O  O8  1  0.042  0.257  0.961  1.0
  O  O9  1  0.257  0.042  0.961  1.0
  O  O10  1  0.045  0.045  0.738  1.0
  O  O11  1  0.343  0.343  0.657  1.0
  O  O12  1  0.467  0.467  0.322  1.0
  O  O13  1  0.468  0.673  0.531  1.0
  O  O14  1  0.673  0.468  0.531  1.0
  O  O15  1  0.390  0.976  0.606  1.0
  O  O16  1  0.976  0.390  0.606  1.0
  O  O17  1  0.734  0.992  0.482  1.0
  O  O18  1  0.992  0.734  0.482  1.0
  O  O19  1  0.523  0.000  0.255  1.0
  O  O20  1  0.000  0.523  0.255  1.0
  O  O21  1  0.386  0.386  0.014  1.0
  O  O22  1  0.511  0.728  0.986  1.0
  O  O23  1  0.728  0.511  0.986  1.0
  O  O24  1  0.132  0.132  0.318  1.0
  O  O25  1  0.119  0.659  0.876  1.0
  O  O26  1  0.659  0.119  0.876  1.0
[/CIF]
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The material described by Li3Cr4PO19 crystallizes in the monoclinic Cm space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(11), one O(2), and two equivalent O(7) atoms to form LiO4 trigonal pyramids that share  a cornercorner with one Cr(1)O4 tetrahedra and corners with two equivalent Cr(2)O4 tetrahedra. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(12), and one O(6) atom. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and  a cornercorner with one Li(1)O4 trigonal pyramid. In the second Cr site, Cr(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and  a cornercorner with one Li(1)O4 trigonal pyramid. In the third Cr site, Cr(3) is bonded to one O(4), one O(9), and two equivalent O(10) atoms to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. P(1) is bonded to one O(3), one O(4), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Cr(3)O4 tetrahedra, and corners with two equivalent Cr(2)O4 tetrahedra. There are twelve inequivalent O sites. In the first O site, O(11) is bonded in a single-bond geometry to one Li(1) atom. In the second O site, O(12) is bonded in a single-bond geometry to one Li(2) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one Li(2) and one Cr(1) atom. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to one Li(1) and one Cr(1) atom. In the fifth O site, O(3) is bonded in a linear geometry to one Cr(1) and one P(1) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one Cr(3) and one P(1) atom. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(2) and one P(1) atom. In the eighth O site, O(6) is bonded in a bent 120 degrees geometry to one Li(2) and one Cr(2) atom. In the ninth O site, O(7) is bonded in a bent 150 degrees geometry to one Li(1) and one Cr(2) atom. In the tenth O site, O(8) is bonded in a single-bond geometry to one Cr(2) atom. In the eleventh O site, O(9) is bonded in a single-bond geometry to one Cr(3) atom. In the twelfth O site, O(10) is bonded in a bent 150 degrees geometry to one Li(2) and one Cr(3) atom. is represented by the CIF card [CIF]
data_Li3Cr4PO19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.940
_cell_length_b   7.940
_cell_length_c   7.769
_cell_angle_alpha   77.763
_cell_angle_beta   77.763
_cell_angle_gamma   102.768
_symmetry_Int_Tables_number   1
_cell_volume   449.309
_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
  Li  Li0  1  0.955  0.955  0.545  1.0
  Li  Li1  1  0.357  0.857  0.880  1.0
  Li  Li2  1  0.857  0.357  0.880  1.0
  Cr  Cr3  1  0.167  0.167  0.834  1.0
  Cr  Cr4  1  0.533  0.920  0.460  1.0
  Cr  Cr5  1  0.920  0.533  0.460  1.0
  Cr  Cr6  1  0.527  0.527  0.069  1.0
  P  P7  1  0.490  0.490  0.507  1.0
  O  O8  1  0.042  0.257  0.961  1.0
  O  O9  1  0.257  0.042  0.961  1.0
  O  O10  1  0.045  0.045  0.738  1.0
  O  O11  1  0.343  0.343  0.657  1.0
  O  O12  1  0.467  0.467  0.322  1.0
  O  O13  1  0.468  0.673  0.531  1.0
  O  O14  1  0.673  0.468  0.531  1.0
  O  O15  1  0.390  0.976  0.606  1.0
  O  O16  1  0.976  0.390  0.606  1.0
  O  O17  1  0.734  0.992  0.482  1.0
  O  O18  1  0.992  0.734  0.482  1.0
  O  O19  1  0.523  0.000  0.255  1.0
  O  O20  1  0.000  0.523  0.255  1.0
  O  O21  1  0.386  0.386  0.014  1.0
  O  O22  1  0.511  0.728  0.986  1.0
  O  O23  1  0.728  0.511  0.986  1.0
  O  O24  1  0.132  0.132  0.318  1.0
  O  O25  1  0.119  0.659  0.876  1.0
  O  O26  1  0.659  0.119  0.876  1.0
[/CIF]
.