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#$Date: 2016-03-23 03:33:33 +0200 (Wed, 23 Mar 2016) $
#$Revision: 179251 $
#$URL: svn://www.crystallography.net/cod/cif/4/31/71/4317123.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_4317123
loop_
_publ_author_name
'Takashi Endo'
'Yoshihiro Doi'
'Makoto Wakeshima'
'Yukio Hinatsu'
_publ_contact_author_address
;Division of Chemistry,
Graduate School of Science,
Hokkaido University,
Sapporo 060-0810, Japan
;
_publ_contact_author_email       t-endo38232@mail.sci.hokudai.ac.jp
_publ_contact_author_fax         +81-11-706-2702
_publ_contact_author_name        'Takashi Endo'
_publ_contact_author_phone       +81-11-706-4931
_publ_section_title
;
 Crystal Structures and Magnetic Properties of New Europium Melilites
 Eu2MSi2O7 (M = Mg, Mn) and Their Strontium Analogues
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              10809
_journal_page_last               10814
_journal_paper_doi               10.1021/ic1011007
_journal_volume                  49
_journal_year                    2010
_chemical_formula_sum            'Mg O7 Si2 Sr2'
_chemical_formula_weight         367.71
_space_group_IT_number           113
_symmetry_cell_setting           tetragonal
_symmetry_Int_Tables_number      113
_symmetry_space_group_name_Hall  'P -4 2ab'
_symmetry_space_group_name_H-M   'P -4 21 m'
_cell_angle_alpha                90.0
_cell_angle_beta                 90.0
_cell_angle_gamma                90.0
_cell_formula_units_Z            2
_cell_length_a                   8.0107(2)
_cell_length_b                   8.0107(2)
_cell_length_c                   5.1636(1)
_cell_measurement_temperature    293(2)
_cell_volume                     331.355(13)
_diffrn_ambient_temperature      293
_diffrn_radiation_monochromator  none
_diffrn_radiation_type           'Cu K\a1'
_diffrn_radiation_wavelength     1.54059
_pd_calc_method                  'Rietveld Refinement'
_pd_meas_2theta_range_inc        0.020
_pd_meas_2theta_range_max        120.000
_pd_meas_2theta_range_min        10.000
_pd_meas_number_of_points        5501
_pd_phase_name                   Sr2MgSi2O7
_pd_proc_ls_prof_R_factor        0.050
_pd_proc_ls_prof_wR_expected     0.030
_pd_proc_ls_prof_wR_factor       0.069
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   2.28
_refine_ls_hydrogen_treatment    noref
_refine_ls_number_constraints    5
_refine_ls_R_I_factor            2.281
_refine_ls_structure_factor_coef Inet
_refine_ls_weighting_scheme      calc
_cod_data_source_file            ic1011007_si_002_4.cif
_cod_data_source_block           Sr2MgSi2O7
_cod_original_cell_volume        331.35(1)
_cod_database_code               4317123
loop_
_symmetry_equiv_pos_site_id
_symmetry_equiv_pos_as_xyz
1 x,y,z
2 -x,-y,z
3 y,-x,-z
4 -y,x,-z
5 -x+1/2,y+1/2,-z
6 x+1/2,-y+1/2,-z
7 -y+1/2,-x+1/2,z
8 y+1/2,x+1/2,z
loop_
_atom_site_label
_atom_site_symmetry_multiplicity
_atom_site_occupancy
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_thermal_displace_type
_atom_site_B_iso_or_equiv
_atom_site_type_symbol
Sr 4 1.0 0.33410(7) 0.16590(7) 0.5074(2) Biso 0.78(2) Sr2+
Mg 2 1.0 0.0 0.0 0.0 Biso 0.5 Mg2+
Si 4 1.0 0.1353(2) 0.3647(2) 0.9458(5) Biso 0.54(6) Si4+
O1 2 1.0 0.5 0.0 0.158(1) Biso 1.0 O
O2 4 1.0 0.1384(5) 0.3616(5) 0.2506(9) Biso 1.0 O
O3 8 1.0 0.0788(4) 0.1947(4) 0.8111(7) Biso 1.0 O
