data_9009238
_publ_section_title
;
 Crystalline post-quartz phase in silica at high pressure
 Sample at ambient conditions
;
_journal_name_full               'Physical Review Letters'
_journal_page_first              155503
_journal_page_last               155503
_journal_paper_doi               10.1103/PhysRevLett.87.155503
_journal_volume                  87
_journal_year                    2001
_chemical_formula_structural     SiO2
_chemical_formula_sum            'O2 Si'
_space_group_IT_number           14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 117.9
_cell_angle_gamma                90
_cell_length_a                   7.66
_cell_length_b                   4.10
_cell_length_c                   5.03
_cell_volume                     139.610
_exptl_crystal_density_diffrn    4.288
_[local]_cod_chemical_formula_sum_orig 'Si O2'
_cod_database_code               9009238
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x,1/2-y,1/2+z
-x,1/2+y,1/2-z
-x,-y,-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si1 0.50000 0.00000 0.00000
Si2 0.16600 0.50090 0.96880
O1 0.05350 0.24290 0.65110
O2 0.72080 0.24180 0.18640
O3 0.38730 0.23730 0.65970
