data_1510772
_publ_section_title
;
 Na2 B2 Se7, K2 B2 S7 und K2 B2 Se7: Drei Perchalkogenoborate mit neuem
 polymeren Anionengeruest
;
_journal_name_full
'Zeitschrift fuer Anorganische und Allgemeine Chemie'
_journal_page_first              1898
_journal_page_last               1904
_journal_paper_doi               10.1002/zaac.19946201110
_journal_volume                  620
_journal_year                    1994
_chemical_formula_sum            'B2 Na2 Se7'
_chemical_name_systematic        'Na2 (B2 (Se2)3 Se)'
_space_group_IT_number           15
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 119.17
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   14.919
_cell_length_b                   6.703
_cell_length_c                   11.863
_cell_volume                     1035.872
_citation_journal_id_ASTM        ZAACAB
_[local]_cod_data_source_file    boron_269.cif
_[local]_cod_data_source_block   B2Na2Se7
_cod_database_code               1510772
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x,y,-z+1/2
-x,-y,-z
x,-y,z-1/2
x+1/2,y+1/2,z
-x+1/2,y+1/2,-z+1/2
-x+1/2,-y+1/2,-z
x+1/2,-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
Se1 Se 0 0.4822 0.25 1 0.0
Na1 Na 0.6069 0.7216 0.0322 1 0.0
B1 B 0.882 0.2857 0.1482 1 0.0
Se3 Se 0.76223 0.39381 0.16699 1 0.0
Se2 Se 0.62384 0.18606 0.0249 1 0.0
Se4 Se 0.91345 0.00265 0.22589 1 0.0
