The material described by LiMnP2O7 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(7) atoms to form distorted LiO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  an edgeedge with one Li(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. Mn(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form MnO5 trigonal bipyramids that share corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra,  a cornercorner with one Li(1)O5 trigonal bipyramid, and  an edgeedge with one Li(1)O5 trigonal bipyramid. 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  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent Li(1)O5 trigonal bipyramids, and corners with three equivalent Mn(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, and corners with three equivalent Li(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Li(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiMnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.134
_cell_length_b   6.805
_cell_length_c   9.165
_cell_angle_alpha   69.227
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   474.271
_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
  Li  Li0  1  0.437  0.208  0.916  1.0
  Li  Li1  1  0.937  0.792  0.584  1.0
  Li  Li2  1  0.063  0.208  0.416  1.0
  Li  Li3  1  0.563  0.792  0.084  1.0
  Mn  Mn4  1  0.070  0.300  0.825  1.0
  Mn  Mn5  1  0.570  0.700  0.675  1.0
  Mn  Mn6  1  0.430  0.300  0.325  1.0
  Mn  Mn7  1  0.930  0.700  0.175  1.0
  P  P8  1  0.726  0.456  0.474  1.0
  P  P9  1  0.226  0.544  0.026  1.0
  P  P10  1  0.739  0.055  0.764  1.0
  P  P11  1  0.239  0.945  0.736  1.0
  P  P12  1  0.274  0.544  0.526  1.0
  P  P13  1  0.774  0.456  0.974  1.0
  P  P14  1  0.261  0.945  0.236  1.0
  P  P15  1  0.761  0.055  0.264  1.0
  O  O16  1  0.581  0.485  0.362  1.0
  O  O17  1  0.888  0.456  0.392  1.0
  O  O18  1  0.770  0.621  0.051  1.0
  O  O19  1  0.270  0.379  0.449  1.0
  O  O20  1  0.419  0.515  0.638  1.0
  O  O21  1  0.112  0.544  0.608  1.0
  O  O22  1  0.230  0.379  0.949  1.0
  O  O23  1  0.730  0.621  0.551  1.0
  O  O24  1  0.612  0.456  0.892  1.0
  O  O25  1  0.919  0.485  0.862  1.0
  O  O26  1  0.311  0.762  0.396  1.0
  O  O27  1  0.753  0.863  0.212  1.0
  O  O28  1  0.090  0.894  0.192  1.0
  O  O29  1  0.388  0.964  0.116  1.0
  O  O30  1  0.189  0.762  0.896  1.0
  O  O31  1  0.747  0.863  0.712  1.0
  O  O32  1  0.888  0.036  0.384  1.0
  O  O33  1  0.410  0.894  0.692  1.0
  O  O34  1  0.590  0.106  0.308  1.0
  O  O35  1  0.112  0.964  0.616  1.0
  O  O36  1  0.253  0.137  0.288  1.0
  O  O37  1  0.811  0.238  0.104  1.0
  O  O38  1  0.612  0.036  0.884  1.0
  O  O39  1  0.910  0.106  0.808  1.0
  O  O40  1  0.247  0.137  0.788  1.0
  O  O41  1  0.689  0.238  0.604  1.0
  O  O42  1  0.081  0.515  0.138  1.0
  O  O43  1  0.388  0.544  0.108  1.0
[/CIF]
.
The material described by LiMnP2O7 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(7) atoms to form distorted LiO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  an edgeedge with one Li(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. Mn(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form MnO5 trigonal bipyramids that share corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra,  a cornercorner with one Li(1)O5 trigonal bipyramid, and  an edgeedge with one Li(1)O5 trigonal bipyramid. 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  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent Li(1)O5 trigonal bipyramids, and corners with three equivalent Mn(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, and corners with three equivalent Li(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Li(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiMnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.134
_cell_length_b   6.805
_cell_length_c   9.165
_cell_angle_alpha   69.227
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   474.271
_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
  Li  Li0  1  0.437  0.208  0.916  1.0
  Li  Li1  1  0.937  0.792  0.584  1.0
  Li  Li2  1  0.063  0.208  0.416  1.0
  Li  Li3  1  0.563  0.792  0.084  1.0
  Mn  Mn4  1  0.070  0.300  0.825  1.0
  Mn  Mn5  1  0.570  0.700  0.675  1.0
  Mn  Mn6  1  0.430  0.300  0.325  1.0
  Mn  Mn7  1  0.930  0.700  0.175  1.0
  P  P8  1  0.726  0.456  0.474  1.0
  P  P9  1  0.226  0.544  0.026  1.0
  P  P10  1  0.739  0.055  0.764  1.0
  P  P11  1  0.239  0.945  0.736  1.0
  P  P12  1  0.274  0.544  0.526  1.0
  P  P13  1  0.774  0.456  0.974  1.0
  P  P14  1  0.261  0.945  0.236  1.0
  P  P15  1  0.761  0.055  0.264  1.0
  O  O16  1  0.581  0.485  0.362  1.0
  O  O17  1  0.888  0.456  0.392  1.0
  O  O18  1  0.770  0.621  0.051  1.0
  O  O19  1  0.270  0.379  0.449  1.0
  O  O20  1  0.419  0.515  0.638  1.0
  O  O21  1  0.112  0.544  0.608  1.0
  O  O22  1  0.230  0.379  0.949  1.0
  O  O23  1  0.730  0.621  0.551  1.0
  O  O24  1  0.612  0.456  0.892  1.0
  O  O25  1  0.919  0.485  0.862  1.0
  O  O26  1  0.311  0.762  0.396  1.0
  O  O27  1  0.753  0.863  0.212  1.0
  O  O28  1  0.090  0.894  0.192  1.0
  O  O29  1  0.388  0.964  0.116  1.0
  O  O30  1  0.189  0.762  0.896  1.0
  O  O31  1  0.747  0.863  0.712  1.0
  O  O32  1  0.888  0.036  0.384  1.0
  O  O33  1  0.410  0.894  0.692  1.0
  O  O34  1  0.590  0.106  0.308  1.0
  O  O35  1  0.112  0.964  0.616  1.0
  O  O36  1  0.253  0.137  0.288  1.0
  O  O37  1  0.811  0.238  0.104  1.0
  O  O38  1  0.612  0.036  0.884  1.0
  O  O39  1  0.910  0.106  0.808  1.0
  O  O40  1  0.247  0.137  0.788  1.0
  O  O41  1  0.689  0.238  0.604  1.0
  O  O42  1  0.081  0.515  0.138  1.0
  O  O43  1  0.388  0.544  0.108  1.0
[/CIF]
.