#------------------------------------------------------------------------------
#$Date: 2020-07-30 10:49:49 +0300 (Thu, 30 Jul 2020) $
#$Revision: 254669 $
#$URL: file:///home/coder/svn-repositories/cod/cif/4/00/27/4002778.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_4002778
loop_
_publ_author_name
'Wang, Zhenbin'
'Chu, Iek-Heng'
'Zhou, Fei'
'Ong, Shyue Ping'
_publ_section_title
;
 Electronic Structure Descriptor for the Discovery of Narrow-Band
 Red-Emitting Phosphors
;
_journal_issue                   11
_journal_name_full               'Chemistry of Materials'
_journal_page_first              4024
_journal_paper_doi               10.1021/acs.chemmater.6b01496
_journal_volume                  28
_journal_year                    2016
_chemical_formula_structural     CaMg(SiN2)2
_chemical_formula_sum            'Ca4 Mg4 N16 Si8'
_space_group_IT_number           20
_symmetry_Int_Tables_number      20
_symmetry_space_group_name_Hall  'C 2c 2'
_symmetry_space_group_name_H-M   'C 2 2 21'
_cell_angle_alpha                90.00000000
_cell_angle_beta                 90.00000000
_cell_angle_gamma                90.00000000
_cell_formula_units_Z            4
_cell_length_a                   7.24579982
_cell_length_b                   7.65169825
_cell_length_c                   6.92316639
_cell_volume                     383.839
_cod_data_source_file            27.cif
_cod_data_source_block           CaMg(SiN2)2
_cod_original_cell_volume        383.838855842
_cod_original_sg_symbol_H-M      C222_1
_cod_original_formula_sum        'Ca4 Mg4 Si8 N16'
_cod_database_code               4002778
loop_
_symmetry_equiv_pos_site_id
_symmetry_equiv_pos_as_xyz
1 'x, y, z'
2 '-x, -y, z+1/2'
3 'x, -y, -z'
4 '-x, y, -z+1/2'
5 'x+1/2, y+1/2, z'
6 '-x+1/2, -y+1/2, z+1/2'
7 'x+1/2, -y+1/2, -z'
8 '-x+1/2, y+1/2, -z+1/2'
loop_
_atom_site_aniso_type_symbol
_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
Mg 0 0 0 0 0 0
Ca 0 0 0 0 0 0
Si 0 0 0 0 0 0
N 0 0 0 0 0 0
loop_
_atom_site_type_symbol
_atom_site_label
_atom_site_symmetry_multiplicity
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Ca Ca1 4 0.000000 0.203041 0.750000 1
Mg Mg2 4 0.189707 0.500000 0.500000 1
Si Si3 4 0.000000 0.196223 0.250000 1
Si Si4 4 0.186081 0.500000 0.000000 1
N N5 8 0.035511 0.325967 0.049108 1
N N6 8 0.192378 0.054285 0.284792 1
_cod_struct_determination_method theoretical
