#\#CIF_2.0
# Created by the Bilbao Crystallographic Server
# http://www.cryst.ehu.es
# Date: 01/10/2024

data_5yOhtAoR
_audit_creation_date            2024-01-10
_audit_creation_method          "Bilbao Crystallographic Server"

_chemical_name_systematic
;
;
_chemical_name_common                    ?
_chemical_formula_moiety                 ?
_chemical_formula_structural             ?
_chemical_formula_analytical             ?
_chemical_formula_iupac                  ?
_chemical_formula_sum                    "Eu1 Al2 Si2"
_chemical_formula_weight                 ?
_chemical_melting_point                  ?
_chemical_compound_source                ?
_chemical_absolute_configuration         ?


_citation_journal_abbrev        "J. less-common met."
_citation_journal_volume        146
_citation_page_first            327
_citation_page_last             335
_citation_article_id            .
_citation_year                  1989
_citation_DOI           		10.1016/0022-5088(89)90390-1

loop_
_citation_author_name
"P. Schobinger-Papamantellos"
"F. Hulliger"

_temperature_position_structure         .
_temperature_atom_positions             .
_temperature_non-magn_atom_positions    .
_temperature_cell_parameters            .

_atomic_positions_source_database_code_ICSD  607471
_atomic_positions_source_other               .

_transition_temperature  35
_experiment_temperature  9

loop_
_irrep_id
_irrep_dimension
_irrep_small_dimension
_irrep_direction_type
_irrep_action
_irrep_modes_number
_irrep_presence
mA3+  2  2  special  primary  1  .

_exptl_crystal_magnetic_properties_details
;
NPD
Magnetic moment of the Eu2+ ion, which is estimated to be 5.8(1) muB,
is considerably lower than the expected saturation value.
Direction of the moments on the ab trigonal plane remains undetermined. Here one of the two non-equivalent directions of maximal symmetry has been arbitrarily chosen.
;

_active_magnetic_irreps_details
;
1k magnetic structure
2-dim irrep along a special direction
;

_parent_space_group.name_H-M_alt  'P -3 m 1'
_parent_space_group.IT_number                       164
_parent_space_group.transform_Pp_abc  'a,b,c;0,0,0'

loop_
_parent_propagation_vector.id
_parent_propagation_vector.kxkykz
k1 [0 0 1/2]

_parent_space_group.child_transform_Pp_abc  'a,b,2c;0,0,0'
_space_group_magn.transform_BNS_Pp_abc  '2a+b,b,c;0,0,0'


_space_group_magn.number_BNS  12.63
_space_group_magn.name_BNS  "C_c 2/m"
_space_group_magn.point_group_name  "2/m1'"
_space_group_magn.point_group_number  "5.2.13"
_cell_length_a                 4.162(2)
_cell_length_b                 4.162(2)
_cell_length_c                 14.416(8)
_cell_angle_alpha              90.00
_cell_angle_beta               90.00
_cell_angle_gamma              120.00

loop_
_space_group_symop_magn_operation.id
_space_group_symop_magn_operation.xyz
1 x,y,z,+1 
2 -x,-x+y,-z,+1 
3 -x,-y,-z,+1 
4 x,x-y,z,+1 

loop_
_space_group_symop_magn_centering.id
_space_group_symop_magn_centering.xyz
1 x,y,z,+1 
2 x,y,z+1/2,-1 

loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Eu1 Eu 0.00000 0.00000 0.00000 1
Si1 Si 0.333333 0.666667 0.31500 1
Al1 Al 0.333333 0.666667 0.13400 1

loop_
_atom_site_moment.label
_atom_site_moment.crystalaxis_x
_atom_site_moment.crystalaxis_y
_atom_site_moment.crystalaxis_z
_atom_site_moment.symmform
_atom_site_moment.magnitude
_atom_site_moment.spherical_azimuthal
_atom_site_moment.spherical_polar
Eu1 0.0 5.8(1) 0.0 0,my,0 5.8(1) ? ?

