#------------------------------------------------------------------------------
#$Date: 2009-11-20 13:07:27 +0200 (Fri, 20 Nov 2009) $
#$Revision: 893 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9006878.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_9006878
loop_
_publ_author_name
'Redfern S A T'
'Artioli G'
'Rinaldi R'
'Henderson C M B'
'Knight K S'
'Wood B J'
_publ_section_title
;
 Octahedral cation ordering in olivine at high temperature. II: an in situ
 neutron powder diffraction study on synthetic MgFeSiO4 (Fa50)
 Sample: T = 350 C
;
_journal_name_full               'Physics and Chemistry of Minerals'
_journal_page_first              630
_journal_page_last               637
_journal_volume                  27
_journal_year                    2000
_chemical_formula_sum            'Fe Mg O4 Si'
_chemical_name_mineral           Olivine
_symmetry_space_group_name_H-M   'P b n m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_length_a                   4.8126
_cell_length_b                   10.3916
_cell_length_c                   6.0721
_cell_volume                     303.669
_diffrn_ambient_temperature      623.15
_[local]_cod_chemical_formula_sum_orig '(Fe Mg) Si O4'
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x,y,1/2-z
-x,-y,1/2+z
1/2+x,1/2-y,1/2+z
1/2-x,1/2+y,1/2-z
1/2-x,1/2+y,z
1/2+x,1/2-y,-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
FeM1 0.00000 0.00000 0.00000 0.52500 0.01187
MgM1 0.00000 0.00000 0.00000 0.47500 0.01187
FeM2 0.99220 0.27850 0.25000 0.47500 0.00962
MgM2 0.99220 0.27850 0.25000 0.52500 0.00962
Si 0.42500 0.09740 0.25000 1.00000 0.00524
O1 0.76760 0.09240 0.25000 1.00000 0.01533
O2 0.21690 0.45210 0.25000 1.00000 0.01023
O3 0.28270 0.16370 0.03530 1.00000 0.00997