The structure described by Ca7Ge6 is delta Molybdenum Boride-like structured and crystallizes in the orthorhombic Pnma space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one Ge(1), one Ge(4), two equivalent Ge(2), and two equivalent Ge(3) atoms. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one Ge(3), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(4) atoms. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to three equivalent Ge(2) and four equivalent Ge(1) atoms. In the fourth Ca site, Ca(4) is bonded in a 6-coordinate geometry to two equivalent Ge(2), two equivalent Ge(3), and two equivalent Ge(4) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Ca(4), two equivalent Ca(1), two equivalent Ca(2), three equivalent Ca(3), and one Ge(1) atom. In the second Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Ca(2), two equivalent Ca(4), four equivalent Ca(1), and one Ge(4) atom. In the third Ge site, Ge(4) is bonded in a 9-coordinate geometry to two equivalent Ca(1), two equivalent Ca(4), four equivalent Ca(2), and one Ge(3) atom. In the fourth Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Ca(1), two equivalent Ca(2), four equivalent Ca(3), one Ge(1), and one Ge(2) atom. is represented by the CIF card [CIF]
data_Ca7Ge6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.441
_cell_length_b   8.110
_cell_length_c   22.458
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1355.265
_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
  Ca  Ca0  1  0.016  0.179  0.837  1.0
  Ca  Ca1  1  0.516  0.321  0.663  1.0
  Ca  Ca2  1  0.484  0.679  0.163  1.0
  Ca  Ca3  1  0.984  0.821  0.337  1.0
  Ca  Ca4  1  0.984  0.821  0.163  1.0
  Ca  Ca5  1  0.484  0.679  0.337  1.0
  Ca  Ca6  1  0.516  0.321  0.837  1.0
  Ca  Ca7  1  0.016  0.179  0.663  1.0
  Ca  Ca8  1  0.852  0.682  0.856  1.0
  Ca  Ca9  1  0.352  0.818  0.644  1.0
  Ca  Ca10  1  0.648  0.182  0.144  1.0
  Ca  Ca11  1  0.148  0.318  0.356  1.0
  Ca  Ca12  1  0.148  0.318  0.144  1.0
  Ca  Ca13  1  0.648  0.182  0.356  1.0
  Ca  Ca14  1  0.352  0.818  0.856  1.0
  Ca  Ca15  1  0.852  0.682  0.644  1.0
  Ca  Ca16  1  0.666  0.822  0.481  1.0
  Ca  Ca17  1  0.166  0.678  0.019  1.0
  Ca  Ca18  1  0.834  0.322  0.519  1.0
  Ca  Ca19  1  0.334  0.178  0.981  1.0
  Ca  Ca20  1  0.334  0.178  0.519  1.0
  Ca  Ca21  1  0.834  0.322  0.981  1.0
  Ca  Ca22  1  0.166  0.678  0.481  1.0
  Ca  Ca23  1  0.666  0.822  0.019  1.0
  Ca  Ca24  1  0.685  0.983  0.750  1.0
  Ca  Ca25  1  0.185  0.517  0.750  1.0
  Ca  Ca26  1  0.815  0.483  0.250  1.0
  Ca  Ca27  1  0.315  0.017  0.250  1.0
  Ge  Ge28  1  0.997  0.958  0.945  1.0
  Ge  Ge29  1  0.497  0.542  0.555  1.0
  Ge  Ge30  1  0.503  0.458  0.055  1.0
  Ge  Ge31  1  0.003  0.042  0.445  1.0
  Ge  Ge32  1  0.003  0.042  0.055  1.0
  Ge  Ge33  1  0.503  0.458  0.445  1.0
  Ge  Ge34  1  0.497  0.542  0.945  1.0
  Ge  Ge35  1  0.997  0.958  0.555  1.0
  Ge  Ge36  1  0.817  0.527  0.402  1.0
  Ge  Ge37  1  0.317  0.973  0.098  1.0
  Ge  Ge38  1  0.683  0.027  0.598  1.0
  Ge  Ge39  1  0.183  0.473  0.902  1.0
  Ge  Ge40  1  0.183  0.473  0.598  1.0
  Ge  Ge41  1  0.683  0.027  0.902  1.0
  Ge  Ge42  1  0.317  0.973  0.402  1.0
  Ge  Ge43  1  0.817  0.527  0.098  1.0
  Ge  Ge44  1  0.809  0.395  0.750  1.0
  Ge  Ge45  1  0.309  0.105  0.750  1.0
  Ge  Ge46  1  0.691  0.895  0.250  1.0
  Ge  Ge47  1  0.191  0.605  0.250  1.0
  Ge  Ge48  1  0.575  0.624  0.750  1.0
  Ge  Ge49  1  0.075  0.876  0.750  1.0
  Ge  Ge50  1  0.925  0.124  0.250  1.0
  Ge  Ge51  1  0.425  0.376  0.250  1.0
[/CIF]
.
The structure described by Ca7Ge6 is delta Molybdenum Boride-like structured and crystallizes in the orthorhombic Pnma space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one Ge(1), one Ge(4), two equivalent Ge(2), and two equivalent Ge(3) atoms. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one Ge(3), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(4) atoms. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to three equivalent Ge(2) and four equivalent Ge(1) atoms. In the fourth Ca site, Ca(4) is bonded in a 6-coordinate geometry to two equivalent Ge(2), two equivalent Ge(3), and two equivalent Ge(4) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Ca(4), two equivalent Ca(1), two equivalent Ca(2), three equivalent Ca(3), and one Ge(1) atom. In the second Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Ca(2), two equivalent Ca(4), four equivalent Ca(1), and one Ge(4) atom. In the third Ge site, Ge(4) is bonded in a 9-coordinate geometry to two equivalent Ca(1), two equivalent Ca(4), four equivalent Ca(2), and one Ge(3) atom. In the fourth Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Ca(1), two equivalent Ca(2), four equivalent Ca(3), one Ge(1), and one Ge(2) atom. is represented by the CIF card [CIF]
data_Ca7Ge6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.441
_cell_length_b   8.110
_cell_length_c   22.458
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1355.265
_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
  Ca  Ca0  1  0.016  0.179  0.837  1.0
  Ca  Ca1  1  0.516  0.321  0.663  1.0
  Ca  Ca2  1  0.484  0.679  0.163  1.0
  Ca  Ca3  1  0.984  0.821  0.337  1.0
  Ca  Ca4  1  0.984  0.821  0.163  1.0
  Ca  Ca5  1  0.484  0.679  0.337  1.0
  Ca  Ca6  1  0.516  0.321  0.837  1.0
  Ca  Ca7  1  0.016  0.179  0.663  1.0
  Ca  Ca8  1  0.852  0.682  0.856  1.0
  Ca  Ca9  1  0.352  0.818  0.644  1.0
  Ca  Ca10  1  0.648  0.182  0.144  1.0
  Ca  Ca11  1  0.148  0.318  0.356  1.0
  Ca  Ca12  1  0.148  0.318  0.144  1.0
  Ca  Ca13  1  0.648  0.182  0.356  1.0
  Ca  Ca14  1  0.352  0.818  0.856  1.0
  Ca  Ca15  1  0.852  0.682  0.644  1.0
  Ca  Ca16  1  0.666  0.822  0.481  1.0
  Ca  Ca17  1  0.166  0.678  0.019  1.0
  Ca  Ca18  1  0.834  0.322  0.519  1.0
  Ca  Ca19  1  0.334  0.178  0.981  1.0
  Ca  Ca20  1  0.334  0.178  0.519  1.0
  Ca  Ca21  1  0.834  0.322  0.981  1.0
  Ca  Ca22  1  0.166  0.678  0.481  1.0
  Ca  Ca23  1  0.666  0.822  0.019  1.0
  Ca  Ca24  1  0.685  0.983  0.750  1.0
  Ca  Ca25  1  0.185  0.517  0.750  1.0
  Ca  Ca26  1  0.815  0.483  0.250  1.0
  Ca  Ca27  1  0.315  0.017  0.250  1.0
  Ge  Ge28  1  0.997  0.958  0.945  1.0
  Ge  Ge29  1  0.497  0.542  0.555  1.0
  Ge  Ge30  1  0.503  0.458  0.055  1.0
  Ge  Ge31  1  0.003  0.042  0.445  1.0
  Ge  Ge32  1  0.003  0.042  0.055  1.0
  Ge  Ge33  1  0.503  0.458  0.445  1.0
  Ge  Ge34  1  0.497  0.542  0.945  1.0
  Ge  Ge35  1  0.997  0.958  0.555  1.0
  Ge  Ge36  1  0.817  0.527  0.402  1.0
  Ge  Ge37  1  0.317  0.973  0.098  1.0
  Ge  Ge38  1  0.683  0.027  0.598  1.0
  Ge  Ge39  1  0.183  0.473  0.902  1.0
  Ge  Ge40  1  0.183  0.473  0.598  1.0
  Ge  Ge41  1  0.683  0.027  0.902  1.0
  Ge  Ge42  1  0.317  0.973  0.402  1.0
  Ge  Ge43  1  0.817  0.527  0.098  1.0
  Ge  Ge44  1  0.809  0.395  0.750  1.0
  Ge  Ge45  1  0.309  0.105  0.750  1.0
  Ge  Ge46  1  0.691  0.895  0.250  1.0
  Ge  Ge47  1  0.191  0.605  0.250  1.0
  Ge  Ge48  1  0.575  0.624  0.750  1.0
  Ge  Ge49  1  0.075  0.876  0.750  1.0
  Ge  Ge50  1  0.925  0.124  0.250  1.0
  Ge  Ge51  1  0.425  0.376  0.250  1.0
[/CIF]
.