Dear Nrutya Gopy,
If you search the Crystallography Open Database (COD) at
http://www.crystallography.net
you will be able to find the two different crystalline forms of SnO plus
~80000 more cif files, all for free with a convenient search engine.

Just this time the two cifs follow.
Best regards,
Leo
------------------------------------------------------------
#------------------------------------------------------------------------------
#$Date$
#$Revision$
#$URL$
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided the American Mineralogist Crystal Structure Database,
# http://rruff.geo.arizona.edu/AMS/amcsd.php
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_9012140
loop_
_publ_author_name
'Izumi, F.'
_publ_section_title
;
 Pattern-fitting structure refinement of tin(II) oxide
 Locality: synthetic
;
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              381
_journal_page_last               385
_journal_volume                  38
_journal_year                    1981
_chemical_formula_sum            'O Sn'
_chemical_name_mineral           Romarchite
_space_group_IT_number           129
_symmetry_space_group_name_Hall  'P 4ab 2ab -1ab'
_symmetry_space_group_name_H-M   'P 4/n m m :1'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_length_a                   3.7986
_cell_length_b                   3.7986
_cell_length_c                   4.8408
_cell_volume                     69.850
_[local]_cod_data_source_file    11984.cif
_[local]_cod_data_source_block   global
_[local]_cod_cif_authors_sg_H-M  'P 4/n m m'
_[local]_cod_chemical_formula_sum_orig 'Sn O'
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
1/2-y,1/2-x,z
y,x,-z
y,-x,-z
1/2-y,1/2+x,z
x,-y,z
1/2-x,1/2+y,-z
1/2+x,1/2+y,-z
-x,-y,z
1/2+y,1/2+x,z
-y,-x,-z
-y,x,-z
1/2+y,1/2-x,z
-x,y,z
1/2+x,1/2-y,-z
1/2-x,1/2-y,-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Sn 0.50000 0.00000 0.23690 0.00836
O 0.00000 0.00000 0.00000 0.03293


-------------------------------------------------------------
#------------------------------------------------------------------------------
#$Date: 2008-01-26 13:05:32 +0000 (Sat, 26 Jan 2008) $
#$Revision: 19 $
#$URL: svn://cod.ibt.lt/cod/cif/1/1100020.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_1100020
_chemical_name_systematic          'Tin (II) oxide - red modification'
_chemical_formula_structural       'Sn O'
_chemical_formula_sum              'O Sn'
_publ_section_title
;
The structure of the red modification of tin(II)oxide
;
loop_
_publ_author_name
  'Donaldson, J D'
  'Moser, W'
  'Simpson, W B'
_journal_name_full                 'Acta Crystallographica (1,1948-23,1967)'
_journal_volume                    16
_journal_year                      1963
_journal_page_first                A22
_journal_page_last                 A22
_cell_length_a                     5.
_cell_length_b                     5.72
_cell_length_c                     11.12
_cell_angle_alpha                  90
_cell_angle_beta                   90
_cell_angle_gamma                  90
_cell_volume                       318.0
_cell_formula_units_Z              8
_symmetry_space_group_name_H-M     'C m c 21'
_symmetry_Int_Tables_number        36
_symmetry_cell_setting             orthorhombic
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '-x,y,z'
  '-x,-y,1/2+z'
  'x,-y,1/2+z'
  '1/2+x,1/2+y,z'
  '1/2-x,1/2+y,z'
  '1/2-x,1/2-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
  Sn2+   2.000
  O2-   -2.000
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
  Sn1   Sn2+   4 a 0. 0. 0. 1.  0 d
  Sn2   Sn2+   4 a 0. 0.441 0.254 1.  0 d
  O1    O2-    8 b 0.18 0.25 0.38 1.  0 d




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