#------------------------------------------------------------------------------
#$Date: 2014-07-11 16:35:18 +0200 (Fri, 11 Jul 2014) $
#$Revision: 120071 $
#$URL: svn://www.crystallography.net/cod/cif/1/00/87/1008731.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_1008731
_chemical_name_systematic          'Sodium diarsenidodistannate'
_chemical_formula_structural       'Na (Sn2 As2)'
_chemical_formula_sum              'As2 Na Sn2'
_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)
;
_space_group_IT_number           166
_symmetry_space_group_name_Hall  '-R 3 2"'
_symmetry_space_group_name_H-M   'R -3 m :H'
_[local]_cod_cif_authors_sg_H-M  'R -3 m H'
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                     4.006(2)
_cell_length_b                     4.006(2)
_cell_length_c                     27.58099(500)
_cell_angle_alpha                  90
_cell_angle_beta                   90
_cell_angle_gamma                  120
_cell_volume                       383.3
_cell_formula_units_Z              3
_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
  Na1+   1.000
  Sn2+   2.000
  As2-  -2.500
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
  Na1   Na1+   3 a 0. 0. 0. 1.  0 d
  Sn1   Sn2+   6 c 0. 0. 0.2103(1) 1.  0 d
  As1   As2-   6 c 0. 0. 0.4074(1) 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
  Na1   0.0315(43) 0.0157(22) 0. 0.0315(43) 0. 0.0072(41)
  Sn1   0.0138(4) 0.0069(2) 0. 0.0138(4) 0. 0.0135(6)
  As1   0.0136(6) 0.0068(3) 0. 0.0136(6) 0. 0.0144(8)
_refine_ls_R_factor_all            0.036
_cod_database_code 1008731
_journal_paper_doi 10.1002/zaac.19956210415