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#$Date: 2012-02-03 19:16:24 +0200 (Fri, 03 Feb 2012) $
#$Revision: 32112 $
#$URL: file:///home/coder/svn-repositories/cod/cif/2/30/01/2300101.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# 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_2300101
loop_
_publ_author_name
'Chao-Nan, Xu'
'Wen-Sheng Shi'
_publ_section_title
;
 Observation of orientational disorder in the hexagonal stuffed
 tridymite Sr~0.864~Eu~0.136~Al~2~O~4~ by the maximum-entropy method
;
_journal_issue                   5
_journal_name_full               'Journal of Applied Crystallography'
_journal_page_first              698
_journal_page_last               702
_journal_volume                  37
_journal_year                    2004
_chemical_formula_analytical     'Sr0.864(3) Eu0.136 Al2 O4'
_chemical_formula_moiety         'Al2 Eu0.136 O4 Sr0.864'
_chemical_formula_structural     '(Sr0.864 Eu0.136 O) (Al2O3)'
_chemical_formula_sum            'Al2 Eu0.136 O4 Sr0.864'
_chemical_formula_weight         214.3309
_chemical_name_common            'strontium europium aluminate'
_chemical_name_systematic
;
strontium europium aluminate
;
_space_group_IT_number           182
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  'P 6c 2c'
_symmetry_space_group_name_H-M   'P 63 2 2'
_cell_angle_alpha                90.0
_cell_angle_beta                 90.0
_cell_angle_gamma                120.0
_cell_formula_units_Z            2
_cell_length_a                   5.11635(10)
_cell_length_b                   5.11635(10)
_cell_length_c                   8.3673(2)
_cell_measurement_temperature    297
_cell_volume                     189.687(7)
_computing_cell_refinement       'PowderX (Dong, 1999) developed by C. Dong'
_computing_molecular_graphics
'VENUS (Izumi & Dilanian, 2002) developed by F. Izumi et al.'
_computing_structure_refinement
'RIETAN-2000 (Izumi et al., 2000) developed by F. Izumi'
_diffrn_ambient_temperature      297
_diffrn_radiation_monochromator  'Si(111) double-crystal monochrometor'
_diffrn_radiation_wavelength     0.77571
_exptl_absorpt_coefficient_mu    4.8
_exptl_crystal_density_diffrn    3.73
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             198
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.80
_refine_ls_hydrogen_treatment    none
_refine_ls_number_constraints    1
_refine_ls_number_parameters     28
_refine_ls_structure_factor_coef Inet
_[local]_cod_data_source_file    pd5014.cif
_[local]_cod_data_source_block   SEAO
_[local]_cod_cif_authors_sg_Hall 'P6c 2c'
_cod_original_cell_volume        189.689(6)
_cod_database_code               2300101
loop_
_symmetry_equiv_pos_site_id
_symmetry_equiv_pos_as_xyz
1 x,y,z
2 -y,x-y,z
3 -x+y,-x,z
4 -x,-y,z+1/2
5 y,-x+y,z+1/2
6 x-y,x,z+1/2
7 y,x,-z
8 x-y,-y,-z
9 -x,-x+y,-z
10 -y,-x,-z+1/2
11 -x+y,y,-z+1/2
12 x,x-y,-z+1/2
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_thermal_displace_type
_atom_site_occupancy
_atom_site_type_symbol
Sr 0 0 0.25 Biso 0.864(3) Sr
Eu 0 0 0.25 Biso 0.136 Eu
Al 0.33333 0.66667 0.94731 Biso 1.0 Al
O1 0.4074(6) 0.81477 0.75 Biso 0.333 O
O2 0.36026(6) 0.0012(9) 0.0435(4) Biso 0.500 O
loop_
_atom_type_symbol
_atom_type_description
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
Sr Sr -4.473 .539 'Lawrence Livermore National Laboratory homepage'
Eu Eu -0.068 4.306 'Lawrence Livermore National Laboratory homepage'
Al Al 0.077 .063 'Lawrence Livermore National Laboratory homepage'
O O 0.014 .008 'Lawrence Livermore National Laboratory homepage'