#------------------------------------------------------------------------------
#$Date: 2024-04-25 16:59:02 +0200 (jue 25 de abr de 2024) $
#$Revision: 291351 $
#$URL: svn://www.crystallography.net/cod/cif/9/00/59/9005927.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_9005927
loop_
_publ_author_name
'Ghose, S.'
'Ito, Y.'
'Hatch, D. M.'
_publ_section_title
;
 Paraelectric-antiferroelectric phase transition in titanite, CaTiSiO5
 I. A high temperature X-ray diffraction study of the order parameter
 and transition mechanism
 Sample: T = 500 K
;
_journal_name_full               'Physics and Chemistry of Minerals'
_journal_page_first              591
_journal_page_last               603
_journal_volume                  17
_journal_year                    1991
_chemical_formula_sum            'Ca O5 Si Ti'
_chemical_name_mineral           Titanite
_space_group_IT_number           15
_symmetry_space_group_name_Hall  '-A 2ya'
_symmetry_space_group_name_H-M   'A 1 2/a 1'
_cell_angle_alpha                90
_cell_angle_beta                 113.751
_cell_angle_gamma                90
_cell_length_a                   7.0719
_cell_length_b                   8.7464
_cell_length_c                   6.5783
_cell_formula_units_Z            4
_cell_volume                     372.430
_database_code_amcsd             0007509
_diffrn_ambient_temperature      500
_exptl_crystal_density_diffrn    3.496
_cod_original_formula_sum        'Ca Ti Si O5'
_cod_database_code               9005927
loop_
_space_group_symop_operation_xyz
x,y,z
x,1/2+y,1/2+z
1/2+x,-y,z
1/2+x,1/2-y,1/2+z
1/2-x,y,-z
1/2-x,1/2+y,1/2-z
-x,-y,-z
-x,1/2-y,1/2-z
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Ca 0.03861 0.01229 0.01546 0.00000 0.00077 0.00000
Ti 0.02161 0.01256 0.01005 0.00258 0.00381 -0.00125
Si 0.01161 0.00636 0.00512 0.00000 0.00182 0.00000
O1 0.01002 0.01167 0.02057 0.00000 0.00703 0.00000
O2A 0.02014 0.01535 0.01113 0.00267 0.00434 0.00053
O3A 0.01713 0.01062 0.01409 0.00275 0.00721 0.00323
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ca 0.25000 0.66890 0.50000
Ti 0.50000 0.50000 0.00000
Si 0.75000 0.68270 0.50000
O1 0.75000 0.57030 0.00000
O2A 0.91130 0.56580 0.68570
O3A 0.38290 0.71080 0.89740
loop_
_cod_related_entry_id
_cod_related_entry_database
_cod_related_entry_code
1 AMCSD 0007509
