data_1008735 _chemical_name_systematic 'Strontium diarsenidodistannate' _chemical_formula_structural 'Sr (Sn2 As2)' _chemical_formula_sum 'As2 Sn2 Sr' _publ_section_title ; Arsenidostannate mit Arsen-analogen (Sn As) - Schichten: Darstellung und Struktur von Na (Sn2 As2), Na0.3 Ca0.7 (Sn2 As2), Na0.4 Sr0.6 (Sn2 As2), Na0.6 Ba0.4 (Sn2 As2) und K0.3 Sr0.7 (Sn2 As2) ; loop_ _publ_author_name 'Asbrand, M' 'Eisenmann, B' 'Klein, J' _journal_name_full ; Zeitschrift fuer Anorganische und Allgemeine Chemie ; _journal_coden_ASTM ZAACAB _journal_volume 621 _journal_year 1995 _journal_page_first 576 _journal_page_last 582 _cell_length_a 4.204(1) _cell_length_b 4.204(1) _cell_length_c 26.726(5) _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 409.1 _cell_formula_units_Z 3 _symmetry_space_group_name_H-M 'R -3 m H' _symmetry_Int_Tables_number 166 _symmetry_cell_setting trigonal loop_ _symmetry_equiv_pos_as_xyz 'x,y,z' '-y,x-y,z' 'y-x,-x,z' '-y,-x,z' 'x,x-y,z' 'y-x,y,z' '-x,-y,-z' 'y,y-x,-z' 'x-y,x,-z' 'y,x,-z' '-x,y-x,-z' 'x-y,-y,-z' '1/3+x,2/3+y,2/3+z' '2/3+x,1/3+y,1/3+z' '1/3-y,2/3+x-y,2/3+z' '2/3-y,1/3+x-y,1/3+z' '1/3-x+y,2/3-x,2/3+z' '2/3-x+y,1/3-x,1/3+z' '1/3-y,2/3-x,2/3+z' '2/3-y,1/3-x,1/3+z' '1/3+x,2/3+x-y,2/3+z' '2/3+x,1/3+x-y,1/3+z' '1/3-x+y,2/3+y,2/3+z' '2/3-x+y,1/3+y,1/3+z' '1/3-x,2/3-y,2/3-z' '2/3-x,1/3-y,1/3-z' '1/3+y,2/3-x+y,2/3-z' '2/3+y,1/3-x+y,1/3-z' '1/3+x-y,2/3+x,2/3-z' '2/3+x-y,1/3+x,1/3-z' '1/3+y,2/3+x,2/3-z' '2/3+y,1/3+x,1/3-z' '1/3-x,2/3-x+y,2/3-z' '2/3-x,1/3-x+y,1/3-z' '1/3+x-y,2/3-y,2/3-z' '2/3+x-y,1/3-y,1/3-z' loop_ _atom_type_symbol _atom_type_oxidation_number Sr2+ 2.000 Sn2+ 2.000 As3- -3.000 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 Sr1 Sr2+ 3 a 0. 0. 0. 1. 0 d Sn1 Sn2+ 6 c 0. 0. 0.20860(3) 1. 0 d As1 As3- 6 c 0. 0. 0.40736(5) 1. 0 d loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_22 _atom_site_aniso_U_23 _atom_site_aniso_U_33 Sr1 0.0134(5) 0.0067(3) 0. 0.0134(5) 0. 0.0115(7) Sn1 0.0107(3) 0.0053(1) 0. 0.0107(3) 0. 0.0099(3) As1 0.0095(4) 0.0048(2) 0. 0.0095(4) 0. 0.0102(5) _refine_ls_R_factor_all 0.027