#------------------------------------------------------------------------------
#$Date: 2013-03-28 16:17:04 +0000 (Thu, 28 Mar 2013) $
#$Revision: 77586 $
#$URL: svn://www.crystallography.net/cod/cif/1/00/87/1008786.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_1008786
loop_
_publ_author_name
'Guth, H'
'Heger, G'
'Klein, S'
'Treutmann, W'
'Scheringer, C'
_publ_section_title
;
Strukturverfeinerung von Harnstoff mit Neutronenbeugungsdaten bei 60,
123, 293 K und X-N- und X-X (1S2)-Synthesen bei etwa 100 K
;
_journal_coden_ASTM              ZEKRDZ
_journal_name_full
;
Zeitschrift fuer Kristallographie (149,1979-)
;
_journal_page_first              237
_journal_page_last               254
_journal_volume                  153
_journal_year                    1980
_chemical_compound_source        'synthetic from solution'
_chemical_formula_structural     'C O (N H2)2'
_chemical_formula_sum            'H4 N2 O'
_chemical_name_common            Urea
_chemical_name_mineral           Urea
_chemical_name_systematic        Urea
_symmetry_cell_setting           tetragonal
_symmetry_Int_Tables_number      113
_symmetry_space_group_name_H-M   'P -4 21 m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   5.578(5)
_cell_length_b                   5.578(5)
_cell_length_c                   4.695(5)
_cell_volume                     146.1
_refine_ls_R_factor_all          0.033
_cod_database_code               1008786
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
1/2-x,1/2+y,-z
-x,-y,z
1/2+x,1/2-y,-z
-y,x,-z
1/2+y,1/2+x,z
y,-x,-z
1/2-y,1/2-x,z
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_22
_atom_site_aniso_U_23
_atom_site_aniso_U_33
C1 0.0174(4) 0.0008(5) 0. 0.0174(4) 0. 0.0116(4)
O1 0.0220(5) 0.0020(8) 0. 0.0220(5) 0. 0.0119(5)
N1 0.0333(3) -0.0161(3) 0.0002(2) 0.0333(3) 0.0002(2) 0.0149(3)
H1 0.0484(12) -0.0231(14) -0.0027(7) 0.0484(12) -0.0027(7) 0.0308(12)
H2 0.0485(10) -0.0159(14) 0.0025(5) 0.0485(10) 0.0025(5) 0.0184(7)
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_calc_flag
C1 C4+ 2 c 0. 0.5 0.3290(3) 1. 0 d
O1 O2- 2 c 0. 0.5 0.5970(3) 1. 0 d
N1 N3- 4 e 0.1445(1) 0.6445(1) 0.1791(2) 1. 0 d
H1 H1+ 4 e 0.2561(4) 0.7561(4) 0.2855(6) 1. 0 d
H2 H1+ 4 e 0.1429(4) 0.6429(4) -0.0370(5) 1. 0 d
loop_
_atom_type_symbol
_atom_type_oxidation_number
C4+ 4.000
O2- -2.000
N3- -3.000
H1+ 1.000