The structure described by K2CO3 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form face-sharing KO6 octahedra. In the second K site, K(2) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1), three equivalent K(2), and one C(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent K(1), three equivalent K(2), and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1), three equivalent K(2), and one C(1) atom. is represented by the CIF card [CIF]
data_K2CO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.742
_cell_length_b   5.625
_cell_length_c   6.884
_cell_angle_alpha   80.639
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   372.184
_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
  K  K0  1  0.767  0.738  0.530  1.0
  K  K1  1  0.267  0.262  0.970  1.0
  K  K2  1  0.233  0.262  0.470  1.0
  K  K3  1  0.733  0.738  0.030  1.0
  K  K4  1  0.582  0.240  0.300  1.0
  K  K5  1  0.082  0.760  0.200  1.0
  K  K6  1  0.418  0.760  0.700  1.0
  K  K7  1  0.918  0.240  0.800  1.0
  C  C8  1  0.583  0.250  0.745  1.0
  C  C9  1  0.917  0.250  0.245  1.0
  C  C10  1  0.417  0.750  0.255  1.0
  C  C11  1  0.083  0.750  0.755  1.0
  O  O12  1  0.845  0.065  0.217  1.0
  O  O13  1  0.345  0.935  0.283  1.0
  O  O14  1  0.155  0.935  0.783  1.0
  O  O15  1  0.655  0.065  0.717  1.0
  O  O16  1  0.863  0.418  0.328  1.0
  O  O17  1  0.637  0.418  0.828  1.0
  O  O18  1  0.137  0.582  0.672  1.0
  O  O19  1  0.363  0.582  0.172  1.0
  O  O20  1  0.956  0.734  0.814  1.0
  O  O21  1  0.456  0.266  0.686  1.0
  O  O22  1  0.044  0.266  0.186  1.0
  O  O23  1  0.544  0.734  0.314  1.0
[/CIF]
.
The structure described by K2CO3 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form face-sharing KO6 octahedra. In the second K site, K(2) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1), three equivalent K(2), and one C(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent K(1), three equivalent K(2), and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1), three equivalent K(2), and one C(1) atom. is represented by the CIF card [CIF]
data_K2CO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.742
_cell_length_b   5.625
_cell_length_c   6.884
_cell_angle_alpha   80.639
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   372.184
_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
  K  K0  1  0.767  0.738  0.530  1.0
  K  K1  1  0.267  0.262  0.970  1.0
  K  K2  1  0.233  0.262  0.470  1.0
  K  K3  1  0.733  0.738  0.030  1.0
  K  K4  1  0.582  0.240  0.300  1.0
  K  K5  1  0.082  0.760  0.200  1.0
  K  K6  1  0.418  0.760  0.700  1.0
  K  K7  1  0.918  0.240  0.800  1.0
  C  C8  1  0.583  0.250  0.745  1.0
  C  C9  1  0.917  0.250  0.245  1.0
  C  C10  1  0.417  0.750  0.255  1.0
  C  C11  1  0.083  0.750  0.755  1.0
  O  O12  1  0.845  0.065  0.217  1.0
  O  O13  1  0.345  0.935  0.283  1.0
  O  O14  1  0.155  0.935  0.783  1.0
  O  O15  1  0.655  0.065  0.717  1.0
  O  O16  1  0.863  0.418  0.328  1.0
  O  O17  1  0.637  0.418  0.828  1.0
  O  O18  1  0.137  0.582  0.672  1.0
  O  O19  1  0.363  0.582  0.172  1.0
  O  O20  1  0.956  0.734  0.814  1.0
  O  O21  1  0.456  0.266  0.686  1.0
  O  O22  1  0.044  0.266  0.186  1.0
  O  O23  1  0.544  0.734  0.314  1.0
[/CIF]
.