data_1005028
_chemical_name_systematic          'Distrontium dinitridogermanate(II)'
_chemical_formula_structural       'Sr2 (Ge N2)'
_chemical_formula_sum              'Ge N2 Sr2'
_publ_section_title
;
Synthesis and structure of two new strontium germanium nitrides: Sr3
Ge2 N2 and Sr2 Ge N2
;
loop_
_publ_author_name
  'Clarke, S J'
  'Kowach, G R'
  'DiSalvo, F J'
_journal_name_full                 'Inorganic Chemistry'
_journal_coden_ASTM                INOCAJ
_journal_volume                    35
_journal_year                      1996
_journal_page_first                7009
_journal_page_last                 7012
_cell_length_a                     11.773(2)
_cell_length_b                     11.773(2)
_cell_length_c                     5.409(1)
_cell_angle_alpha                  90
_cell_angle_beta                   90
_cell_angle_gamma                  90
_cell_volume                       749.7
_cell_formula_units_Z              8
_symmetry_space_group_name_H-M     'P 42/m b c'
_symmetry_Int_Tables_number        135
_symmetry_cell_setting             tetragonal
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '-y,x,1/2+z'
  '1/2+x,1/2-y,z'
  '1/2+y,1/2+x,1/2+z'
  'x,y,-z'
  '-y,x,1/2-z'
  '1/2+x,1/2-y,-z'
  '1/2+y,1/2+x,1/2-z'
  '-x,-y,-z'
  'y,-x,1/2-z'
  '1/2-x,1/2+y,-z'
  '1/2-y,1/2-x,1/2-z'
  '-x,-y,z'
  'y,-x,1/2+z'
  '1/2-x,1/2+y,z'
  '1/2-y,1/2-x,1/2+z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
  Sr2+   2.000
  Ge2+   2.000
  N3-   -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+   8 h 0.3671(1) 0.4190(1) 0. 1.  0 d
  Sr2   Sr2+   8 h 0.0224(1) 0.3482(1) 0. 1.  0 d
  Ge1   Ge2+   8 h 0.2559(1) 0.1514(1) 0. 1.  0 d
  N1    N3-    8 h 0.0996(9) 0.1340(7) 0. 1.  0 d
  N2    N3-    8 h 0.3353(9) 0.0131(7) 0. 1.  0 d
_refine_ls_R_factor_all            0.038