data_global
_chemical_name_mineral 'Nierite'
loop_
_publ_author_name
'Billy M'
'Labbe J'
'Selvaraj A'
'Roult G'
_journal_name_full 'Materials Research Bulletin'
_journal_volume 18 
_journal_year 1983
_journal_page_first 921
_journal_page_last 934
_publ_section_title
;
 Modifications structurales du nitrure de silicium en fonction de la
 temperature
 _cod_database_code 1001239
;
_database_code_amcsd 0014302
_chemical_formula_sum 'N4 Si3'
_cell_length_a 7.7660
_cell_length_b 7.7660
_cell_length_c 5.6297
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 294.043
_exptl_crystal_density_diffrn      3.169
_symmetry_space_group_name_H-M 'P 3 1 c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x-y,-y,1/2+z'
  '-y,x-y,z'
  'y,x,1/2+z'
  '-x+y,-x,z'
  '-x,-x+y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
N1   0.00000   0.00000   0.50000
N2   0.33333   0.66667   0.63000
N3   0.65300   0.61150   0.45250
N4   0.31600   0.31910   0.72050
Si1   0.07810   0.50710   0.67640
Si2   0.25300   0.16790   0.46000