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#$Date: 2024-05-02 13:48:35 +0300 (Thu, 02 May 2024) $
#$Revision: 291455 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/00/69/9006949.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_9006949
loop_
_publ_author_name
'Kusaka, K.'
'Hagiya, K.'
'Ohmasa, M.'
'Okano, Y.'
'Mukai, M.'
'Iishi, K.'
'Haga, N.'
_publ_section_title
;Determination of structures of Ca2CoSi2O7, Ca2MgSi2O7, and
 Ca2(Mg.55Fe.45)Si2O7 in incommensurate and normal phases and observation of
 diffuse streaks at high temperature Sample: T = 673 K Melilite group
;
_journal_name_full               'Physics and Chemistry of Minerals'
_journal_page_first              150
_journal_page_last               166
_journal_paper_doi               10.1007/s002690000147
_journal_volume                  28
_journal_year                    2001
_chemical_formula_structural     Ca2(Mg.55Fe.45)Si2O7
_chemical_formula_sum            'Ca2 Fe0.45 Mg0.55 O7 Si2'
_space_group_IT_number           113
_symmetry_space_group_name_Hall  'P -4 2ab'
_symmetry_space_group_name_H-M   'P -4 21 m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_length_a                   7.8958
_cell_length_b                   7.8958
_cell_length_c                   5.0223
_cell_formula_units_Z            2
_cell_volume                     313.109
_database_code_amcsd             0008531
_diffrn_ambient_temperature      673
_exptl_crystal_density_diffrn    3.042
_cod_original_formula_sum        '(Mg.55 Fe.45) Ca2 Si2 O7'
_cod_database_code               9006949
_amcsd_formula_title             Ca2(Mg.55Fe.45)Si2O7
loop_
_space_group_symop_operation_xyz
x,y,z
1/2-y,1/2-x,z
y,-x,-z
1/2-x,1/2+y,-z
-x,-y,z
1/2+y,1/2+x,z
-y,x,-z
1/2+x,1/2-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
Mg 0.00000 0.00000 0.00000 0.55000 0.02330
Fe 0.00000 0.00000 0.00000 0.45000 0.02330
Ca 0.33130 0.16870 0.50590 1.00000 0.02964
Si 0.13850 0.36150 0.93770 1.00000 0.01697
O1 0.00000 0.50000 0.82500 1.00000 0.04179
O2 0.13930 0.36070 0.25560 1.00000 0.03673
O3 0.08130 0.18970 0.78890 1.00000 0.03673
loop_
_cod_related_entry_id
_cod_related_entry_database
_cod_related_entry_code
1 AMCSD 0008531
