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#$Date: 2009-11-18 16:56:34 +0200 (Wed, 18 Nov 2009) $
#$Revision: 858 $
#$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
loop_
_publ_author_name
'Perdikatsis B'
_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
;
_journal_name_full               'Materials Science Forum'
_journal_page_first              809
_journal_page_last               814
_journal_volume                  79
_journal_year                    1991
_chemical_formula_sum            'Ca2.176 F0.169 O8.973 P1.488'
_[local]_cod_chemical_formula_sum_orig 'Ca2.176 P1.488 O8.973 F.169'
_chemical_name_mineral           Carbonate-fluorapatite
_symmetry_space_group_name_H-M   'P 63/m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_length_a                   9.3708
_cell_length_b                   9.3708
_cell_length_c                   6.8880
_cell_volume                     523.814
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_U_iso_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