#------------------------------------------------------------------------------
#$Date: 2013-03-28 18:17:04 +0200 (Thu, 28 Mar 2013) $
#$Revision: 77586 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/01/29/9012919.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided the American Mineralogist Crystal Structure Database,
# http://rruff.geo.arizona.edu/AMS/amcsd.php
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_9012919
loop_
_publ_author_name
'Olijnyk, H.'
'Sikka, S. K.'
'Holzapfel, W. B.'
_publ_section_title
;
 Structural phase transitions in Si and Ge under pressures up to 50 GPa
 Locality: synthetic
 Sample: at P = 43 GPa
 Note: phase VII, structure stable above 43 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
_chemical_name_mineral           Silicon
_space_group_IT_number           194
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_length_a                   2.444
_cell_length_b                   2.444
_cell_length_c                   4.152
_cell_volume                     21.478
_diffrn_ambient_pressure         4.3e+07
_exptl_crystal_density_diffrn    4.343
_cod_database_code               9012919
_amcsd_database_code             AMCSD#0013843
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x,-x+y,1/2+z
x,x-y,1/2-z
-x+y,-x,1/2-z
x-y,x,1/2+z
-y,-x,z
y,x,-z
y,-x+y,-z
-y,x-y,z
x-y,-y,1/2+z
-x+y,y,1/2-z
x,y,1/2-z
-x,-y,1/2+z
x,x-y,z
-x,-x+y,-z
x-y,x,-z
-x+y,-x,z
y,x,1/2+z
-y,-x,1/2-z
-y,x-y,1/2-z
y,-x+y,1/2+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 0.33333 0.66667 0.25000