data_1008735
_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)
;
_journal_coden_ASTM              ZAACAB
_journal_name_full
;
Zeitschrift fuer Anorganische und Allgemeine Chemie
;
_journal_page_first              576
_journal_page_last               582
_journal_paper_doi               10.1002/zaac.19956210415
_journal_volume                  621
_journal_year                    1995
_chemical_formula_structural     'Sr (Sn2 As2)'
_chemical_formula_sum            'As2 Sn2 Sr'
_chemical_name_systematic        'Strontium diarsenidodistannate'
_space_group_IT_number           166
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-R 3 2"'
_symmetry_space_group_name_H-M   'R -3 m :H'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            3
_cell_length_a                   4.204(1)
_cell_length_b                   4.204(1)
_cell_length_c                   26.726(5)
_cell_volume                     409.1
_refine_ls_R_factor_all          0.027
_[local]_cod_cif_authors_sg_H-M  'R -3 m H'
_cod_database_code               1008735
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_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)
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_type_symbol
_atom_type_oxidation_number
Sr2+ 2.000
Sn2+ 2.000
As3- -3.000
