data_9012918
_publ_section_title
;
 Structural phase transitions in Si and Ge under pressures up to 50 GPa
 Locality: synthetic
 Sample: at P = 19.5 GPa
 Note: phase V, structure stable between 16 GPa & 34 GPa
;
_journal_name_full               'Physics Letters'
_journal_page_first              137
_journal_page_last               140
_journal_volume                  103A
_journal_year                    1984
_chemical_formula_sum            Si
_chemical_name_common            Silicon
_space_group_IT_number           191
_symmetry_space_group_name_Hall  '-P 6 2'
_symmetry_space_group_name_H-M   'P 6/m m m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_length_a                   2.527
_cell_length_b                   2.527
_cell_length_c                   2.373
_cell_volume                     13.123
_diffrn_ambient_pressure         1.95e+07
_exptl_crystal_density_diffrn    3.554
_cod_database_code               9012918
loop_
_symmetry_equiv_pos_as_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
