data_1528259
_publ_section_title
;
 An electron-diffraction study of the structure of potassium dichromate
;
_journal_name_full               Kristallografiya
_journal_page_first              44
_journal_page_last               49
_journal_volume                  9
_journal_year                    1964
_chemical_formula_sum            'Cr2 K2 O7'
_chemical_name_systematic        'K2 (Cr2 O7)'
_space_group_IT_number           14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 91.92
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.47
_cell_length_b                   7.35
_cell_length_c                   12.97
_cell_volume                     711.712
_citation_journal_id_ASTM        KRISAJ
_cod_data_source_file            Zhukova_KRISAJ_1964_1683.cif
_cod_data_source_block           Cr2K2O7
_cod_original_cell_volume        711.7115
_cod_database_code               1528259
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x,y+1/2,-z+1/2
-x,-y,-z
x,-y-1/2,z-1/2
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
O1 O-2 0.892 0.18 0.057 1 0.0
K2 K+1 0.78 0.5 0.125 1 0.0
O4 O-2 0.5 0.18 0.057 1 0.0
O7 O-2 0.485 0 0.245 1 0.0
Cr2 Cr+6 0.438 0 0.125 1 0.0
O2 O-2 0.892 0.82 0.057 1 0.0
Cr1 Cr+6 0 0 0.125 1 0.0
O3 O-2 0.215 0 0.057 1 0.0
O5 O-2 0.5 0.82 0.057 1 0.0
K1 K+1 0.385 0.5 0.125 1 0.0
O6 O-2 0 0 0.245 1 0.0
