data_global
_chemical_name_mineral 'Silicon'
loop_
_publ_author_name
'Olijnyk H'
'Sikka S K'
'Holzapfel W B'
_journal_name_full 'Physics Letters'
_journal_volume 103A 
_journal_year 1984
_journal_page_first 137
_journal_page_last 140
_publ_section_title
;
 Structural phase transitions in Si and Ge under pressures up to 50 GPa
 Sample: at P = 19.5 GPa
 Note: phase V, structure stable between 16 GPa & 34 GPa
;
_database_code_amcsd 0015303
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Si'
_cell_length_a 2.527
_cell_length_b 2.527
_cell_length_c 2.373
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 13.123
_exptl_crystal_density_diffrn      3.554
_symmetry_space_group_name_H-M 'P 6/m m m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,z'
  'x,x-y,-z'
  '-x+y,-x,-z'
  'x-y,x,z'
  '-y,-x,z'
  'y,x,-z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x-y,-y,z'
  '-x+y,y,-z'
  'x,y,-z'
  '-x,-y,z'
  'x,x-y,z'
  '-x,-x+y,-z'
  'x-y,x,-z'
  '-x+y,-x,z'
  'y,x,z'
  '-y,-x,-z'
  '-y,x-y,-z'
  'y,-x+y,z'
  '-x+y,y,z'
  'x-y,-y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si   0.00000   0.00000   0.00000