#------------------------------------------------------------------------------
#$Date: 2012-02-28 13:14:52 +0100 (Tue, 28 Feb 2012) $
#$Revision: 35911 $
#$URL: svn://www.crystallography.net/cod/cif/8/10/16/8101618.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_8101618
_journal_name_full  'Zeitschrift fur Kristallographie - NCS'
_journal_year       1999
_publ_section_title
;
 Crystal structure of Praseodum Gallium Oxide Pr4Ga2O9
;
loop_
_publ_author_name
  'Gesing, Thorsten M.'
  'Uecker, Reinhard'
  'Buhl, J.-Christian'
_chemical_name_common  'strontium praseodym aluminate'
_chemical_formula_moiety  'SrPrAlO4'
_chemical_formula_structural  'Sr2 Pr2 Al2 O8'
_chemical_formula_sum  'Al O4 Pr Sr'
_chemical_formula_weight  319.51
_symmetry_cell_setting  tetragonal
_symmetry_space_group_name_H-M  'I 4/m m m'
_symmetry_Int_Tables_number  139
loop_
_symmetry_equiv_pos_as_xyz
 'x, y, z'
 '-x, -y, z'
 '-y, x, z'
 'y, -x, z'
 '-x, y, -z'
 'x, -y, -z'
 'y, x, -z'
 '-y, -x, -z'
 'x+1/2, y+1/2, z+1/2'
 '-x+1/2, -y+1/2, z+1/2'
 '-y+1/2, x+1/2, z+1/2'
 'y+1/2, -x+1/2, z+1/2'
 '-x+1/2, y+1/2, -z+1/2'
 'x+1/2, -y+1/2, -z+1/2'
 'y+1/2, x+1/2, -z+1/2'
 '-y+1/2, -x+1/2, -z+1/2'
 '-x, -y, -z'
 'x, y, -z'
 'y, -x, -z'
 '-y, x, -z'
 'x, -y, z'
 '-x, y, z'
 '-y, -x, z'
 'y, x, z'
 '-x+1/2, -y+1/2, -z+1/2'
 'x+1/2, y+1/2, -z+1/2'
 'y+1/2, -x+1/2, -z+1/2'
 '-y+1/2, x+1/2, -z+1/2'
 'x+1/2, -y+1/2, z+1/2'
 '-x+1/2, y+1/2, z+1/2'
 '-y+1/2, -x+1/2, z+1/2'
 'y+1/2, x+1/2, z+1/2'
_cell_length_a  3.7360(10)
_cell_length_b  3.7360(10)
_cell_length_c  12.532(3)
_cell_angle_alpha  90.00
_cell_angle_beta  90.00
_cell_angle_gamma  90.00
_cell_volume  174.92(8)
_cell_formula_units_Z  2
_cell_measurement_temperature  293(2)
_exptl_crystal_density_diffrn  6.066
_diffrn_ambient_temperature  293(2)
_refine_ls_R_factor_obs  0.0104
_refine_ls_wR_factor_obs  0.0207
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_thermal_displace_type
_atom_site_occupancy
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_disorder_group
Pr1 Pr 0.0000 0.0000 0.35845(5) 0.0041(2) Uani 0.50 d SP .
Sr1 Sr 0.0000 0.0000 0.35845(5) 0.0041(2) Uani 0.50 d SP .
Al1 Al 0.0000 0.0000 0.0000 0.0051(6) Uani 1 d S .
O1 O 0.0000 0.5000 0.0000 0.0051(8) Uani 1 d S .
O2 O 0.0000 0.0000 0.1640(4) 0.0104(11) Uani 1 d S .
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_23
_atom_site_aniso_U_13
_atom_site_aniso_U_12
Pr1 0.0043(2) 0.0043(2) 0.0037(3) 0.000 0.000 0.000
Sr1 0.0043(2) 0.0043(2) 0.0037(3) 0.000 0.000 0.000
Al1 0.0041(7) 0.0041(7) 0.007(2) 0.000 0.000 0.000
O1 0.004(2) 0.003(2) 0.008(3) 0.000 0.000 0.000
O2 0.0114(14) 0.0114(14) 0.008(4) 0.000 0.000 0.000
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
_geom_bond_site_symmetry_2
_geom_bond_publ_flag
Pr1 O2 2.437(5) . ?
Pr1 O1 2.5761(6) 11 ?
Pr1 O1 2.5761(6) 9_545 ?
Pr1 O1 2.5761(6) 11_545 ?
Pr1 O1 2.5761(6) 9_445 ?
Pr1 O2 2.6567(9) 25_445 ?
Pr1 O2 2.6567(9) 25 ?
Pr1 O2 2.6567(9) 25_455 ?
Pr1 O2 2.6567(9) 25_545 ?
Pr1 Al1 3.1821(7) 9 ?
Pr1 Al1 3.1821(7) 9_445 ?
Pr1 Al1 3.1821(7) 9_455 ?
Sr1 O2 2.437(5) . ?
Sr1 O1 2.5761(6) 11 ?
Sr1 O1 2.5761(6) 9_545 ?
Sr1 O1 2.5761(6) 11_545 ?
Sr1 O1 2.5761(6) 9_445 ?
Sr1 O2 2.6567(9) 25_445 ?
Sr1 O2 2.6567(9) 25 ?
Sr1 O2 2.6567(9) 25_455 ?
Sr1 O2 2.6567(9) 25_545 ?
Sr1 Al1 3.1821(7) 9 ?
Sr1 Al1 3.1821(7) 9_445 ?
Sr1 Al1 3.1821(7) 9_455 ?
Al1 O1 1.8680(5) 3_655 ?
Al1 O1 1.8680(5) . ?
Al1 O1 1.8680(5) 3 ?
Al1 O1 1.8680(5) 1_545 ?
Al1 O2 2.055(5) 17 ?
Al1 O2 2.055(5) . ?
Al1 Sr1 3.1821(7) 25 ?
Al1 Pr1 3.1821(7) 25 ?
Al1 Pr1 3.1821(7) 9_444 ?
Al1 Sr1 3.1821(7) 9_444 ?
Al1 Pr1 3.1821(7) 25_455 ?
Al1 Pr1 3.1821(7) 25_545 ?
O1 Al1 1.8680(5) 1_565 ?
O1 Sr1 2.5761(6) 25 ?
O1 Pr1 2.5761(6) 25 ?
O1 Pr1 2.5761(6) 9_454 ?
O1 Sr1 2.5761(6) 9_454 ?
O1 Pr1 2.5761(6) 25_455 ?
O1 Sr1 2.5761(6) 25_455 ?
O1 Sr1 2.5761(6) 9_554 ?
O1 Pr1 2.5761(6) 9_554 ?
O2 Sr1 2.6567(9) 25_445 ?
O2 Pr1 2.6567(9) 25_445 ?
O2 Sr1 2.6567(9) 25 ?
O2 Pr1 2.6567(9) 25 ?
O2 Pr1 2.6567(9) 25_455 ?
O2 Pr1 2.6567(9) 25_545 ?
O2 Sr1 2.6567(9) 25_545 ?
O2 Sr1 2.6567(9) 25_455 ?
_cod_database_code 8101618