data_global
_amcsd_formula_title 'As2 Na0.4 Sn2 Sr0.6'
loop_
_publ_author_name
'Asbrand M'
'Eisenmann B'
'Klein J'
_journal_name_full 'Zeitschrift fur Anorganische und Allgemeine Chemie'
_journal_volume 621 
_journal_year 1995
_journal_page_first 576
_journal_page_last 582
_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 (Sn2As2),
 Na0.6 Ba0.4 (Sn2 As2) und K0.3 Sr0.7 (Sn2 As2)
 _cod_database_code 1008733
;
_database_code_amcsd 0016614
_chemical_formula_sum '(Na.4 Sr.6) Sn2 As2'
_cell_length_a 4.117
_cell_length_b 4.117
_cell_length_c 27.185
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 399.045
_exptl_crystal_density_diffrn      5.606
_symmetry_space_group_name_H-M 'R -3 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '2/3+x,1/3+y,1/3+z'
  '1/3+x,2/3+y,2/3+z'
  'x,x-y,z'
  '2/3+x,1/3+x-y,1/3+z'
  '1/3+x,2/3+x-y,2/3+z'
  'y,x,-z'
  '2/3+y,1/3+x,1/3-z'
  '1/3+y,2/3+x,2/3-z'
  '-x+y,y,z'
  '2/3-x+y,1/3+y,1/3+z'
  '1/3-x+y,2/3+y,2/3+z'
  '-x,-x+y,-z'
  '2/3-x,1/3-x+y,1/3-z'
  '1/3-x,2/3-x+y,2/3-z'
  '-y,-x,z'
  '2/3-y,1/3-x,1/3+z'
  '1/3-y,2/3-x,2/3+z'
  'x-y,-y,-z'
  '2/3+x-y,1/3-y,1/3-z'
  '1/3+x-y,2/3-y,2/3-z'
  'y,-x+y,-z'
  '2/3+y,1/3-x+y,1/3-z'
  '1/3+y,2/3-x+y,2/3-z'
  '-x+y,-x,z'
  '2/3-x+y,1/3-x,1/3+z'
  '1/3-x+y,2/3-x,2/3+z'
  '-x,-y,-z'
  '2/3-x,1/3-y,1/3-z'
  '1/3-x,2/3-y,2/3-z'
  '-y,x-y,z'
  '2/3-y,1/3+x-y,1/3+z'
  '1/3-y,2/3+x-y,2/3+z'
  'x-y,x,-z'
  '2/3+x-y,1/3+x,1/3-z'
  '1/3+x-y,2/3+x,2/3-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Na1   0.00000   0.00000   0.00000   0.40000
Sr1   0.00000   0.00000   0.00000   0.60000
Sn1   0.00000   0.00000   0.20900   1.00000
As1   0.00000   0.00000   0.40780   1.00000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Na1 0.01070 0.01070 0.00910 0.00540 0.00000 0.00000
Sr1 0.01070 0.01070 0.00910 0.00540 0.00000 0.00000
Sn1 0.00930 0.00930 0.00910 0.00460 0.00000 0.00000
As1 0.00880 0.00880 0.00950 0.00440 0.00000 0.00000