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#$Date: 2008-01-14 00:15:36 +0200 (Mon, 14 Jan 2008) $
#$Revision: 14 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9009981.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_9009981
_chemical_name 'Carbonate-fluorapatite'
loop_
_publ_author_name
'Perdikatsis B'
_journal_name_full "Materials Science Forum"
_journal_volume 79
_journal_year 1991
_journal_page_first 809
_journal_page_last 814
_publ_section_title
;
 X-ray powder diffraction study of francolite by the Rietveld method
 Locality: Epirus, Greece
 Sample: T = 1200 C
 Note: Reported structure does not reproduce reported formula or bondlengths
;
_chemical_formula_sum 'Ca2.176 P1.488 O8.973 F.169'
_cell_length_a 9.3708
_cell_length_b 9.3708
_cell_length_c 6.8880
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 523.814
_symmetry_space_group_name_H-M 'P 63/m'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '-x+y,-x,1/2-z'
  'x-y,x,1/2+z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  'x-y,x,-z'
  '-x+y,-x,z'
  '-y,x-y,1/2-z'
  'y,-x+y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_Uiso_or_equiv
Ca1   0.33333   0.66667   0.00050   0.33800   0.01512
Ca2   0.24100   0.99150   0.25000   0.50000   0.00566
P   0.39830   0.36860   0.25000   0.49600   0.00375
O1   0.32230   0.48280   0.25000   0.49200   0.00532
O2   0.58980   0.46380   0.25000   0.49900   0.01779
O3   0.34120   0.25580   0.06950   1.00000   0.01360
F   0.00000   0.00000   0.25000   0.16900   0.05181