data_1007083 _chemical_name_systematic 'Dipotassium hydrogenbis(chromato)arsenate' _chemical_formula_structural 'K2 H Cr2 As O10' _chemical_formula_sum 'H As Cr2 K2 O10' _publ_section_title ; Structure de l'Hydrogenobis(chromato)arsenate de Potassium K~2~ H Cr~2~ As O~10~ et Donnees Cristallographiques sur K~2~ H Cr~2~ P O~10~ ; loop_ _publ_author_name 'Averbuch-Pouchot, M T' 'Durif, A' 'Guitel, J C' _journal_name_full 'Acta Crystallographica B (24,1968-38,1982)' _journal_coden_ASTM ACBCAR _journal_volume 34 _journal_year 1978 _journal_page_first 3725 _journal_page_last 3727 _cell_length_a 7.712(3) _cell_length_b 7.712(3) _cell_length_c 14.644(8) _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 754.3 _cell_formula_units_Z 3 _symmetry_space_group_name_H-M 'P 31' _symmetry_Int_Tables_number 144 _symmetry_cell_setting trigonal loop_ _symmetry_equiv_pos_as_xyz 'x,y,z' '-y,x-y,1/3+z' 'y-x,-x,2/3+z' loop_ _atom_type_symbol _atom_type_oxidation_number Cr6+ 6.000 As5+ 5.000 K1+ 1.000 O2- -2.000 H1+ 1.000 loop_ _atom_site_label _atom_site_type_symbol _atom_site_symmetry_multiplicity _atom_site_Wyckoff_symbol _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_attached_hydrogens _atom_site_calc_flag Cr1 Cr6+ 3 a 0.4278(3) 0.4243(3) 0.2449 1. 0 d Cr2 Cr6+ 3 a 0.4191(3) 0.4205(4) 0.7530(2) 1. 0 d As1 As5+ 3 a 0.1281(2) 0.0199(2) 0.3493(2) 1. 0 d K1 K1+ 3 a 0.5520(5) 0.0182(5) 0.8389(3) 1. 0 d K2 K1+ 3 a 0.6083(5) 0.0061(5) 0.3323(3) 1. 0 d O1 O2- 3 a 0.3557(17) 0.1857(17) 0.3021(8) 1. 0 d O2 O2- 3 a 0.6253(22) 0.4796(23) 0.1851(11) 1. 0 d O3 O2- 3 a 0.4692(28) 0.5941(19) 0.3209(9) 1. 0 d O4 O2- 3 a 0.2453(20) 0.3904(18) 0.1759(10) 1. 0 d O5 O2- 3 a 0.1898(17) 0.3371(19) 0.6867(8) 1. 0 d O6 O2- 3 a 0.7722(22) 0.1699(20) 0.1422(12) 1. 0 d O7 O2- 3 a 0.1433(20) 0.5565(19) 0.4931(9) 1. 0 d O8 O2- 3 a 0.4945(24) 0.0868(24) 0.0147(9) 1. 0 d O9 O2- 3 a 0.0873(22) 0.097(2) 0.4482(8) 1. 0 d O10 O2- 3 a 0.0157(21) -0.0424(20) 0.6142(9) 1. 0 d H1 H1+ 3 a -1. -1. -1. 1. 0 dum _refine_ls_R_factor_all 0.054