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#$Date: 2016-02-18 17:37:37 +0200 (Thu, 18 Feb 2016) $
#$Revision: 176729 $
#$URL: svn://www.crystallography.net/cod/cif/1/00/18/1001855.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_1001855
loop_
_publ_author_name
'Leclaire, A'
'Borel, M M'
'Grandin, A'
'Raveau, B'
_publ_section_title
;
A mixed-valence niobium phosphate with an empty nasicon structure: Nb2
(P O4)3
;
_journal_coden_ASTM              ACSCEE
_journal_name_full               'Acta Crystallographica C (39,1983-)'
_journal_page_first              699
_journal_page_last               701
_journal_volume                  45
_journal_year                    1989
_chemical_formula_structural     'Nb2 (P O4)3'
_chemical_formula_sum            'Nb2 O12 P3'
_chemical_name_systematic        'Niobium(IV) niobium(V) phosphate(V)'
_space_group_IT_number           167
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-R 3 2"c'
_symmetry_space_group_name_H-M   'R -3 c :H'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            6
_cell_length_a                   8.6974(7)
_cell_length_b                   8.6974(7)
_cell_length_c                   22.12299(200)
_cell_volume                     1449.3
_refine_ls_R_factor_all          0.0347
_cod_original_sg_symbol_H-M      'R -3 c H'
_cod_database_code               1001855
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-y,x-y,z
y-x,-x,z
-y,-x,1/2+z
x,x-y,1/2+z
y-x,y,1/2+z
-x,-y,-z
y,y-x,-z
x-y,x,-z
y,x,1/2-z
-x,y-x,1/2-z
x-y,-y,1/2-z
1/3+x,2/3+y,2/3+z
2/3+x,1/3+y,1/3+z
1/3-y,2/3+x-y,2/3+z
2/3-y,1/3+x-y,1/3+z
1/3-x+y,2/3-x,2/3+z
2/3-x+y,1/3-x,1/3+z
1/3-y,2/3-x,1/6+z
2/3-y,1/3-x,5/6+z
1/3+x,2/3+x-y,1/6+z
2/3+x,1/3+x-y,5/6+z
1/3-x+y,2/3+y,1/6+z
2/3-x+y,1/3+y,5/6+z
1/3-x,2/3-y,2/3-z
2/3-x,1/3-y,1/3-z
1/3+y,2/3-x+y,2/3-z
2/3+y,1/3-x+y,1/3-z
1/3+x-y,2/3+x,2/3-z
2/3+x-y,1/3+x,1/3-z
1/3+y,2/3+x,1/6-z
2/3+y,1/3+x,5/6-z
1/3-x,2/3-x+y,1/6-z
2/3-x,1/3-x+y,5/6-z
1/3+x-y,2/3-y,1/6-z
2/3+x-y,1/3-y,5/6-z
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
Nb1 Nb4+ 12 c 0. 0. 0.14131(3) 1. 0 d
P1 P5+ 18 e 0.2821(2) 0. 0.25 1. 0 d
O1 O2- 36 f 0.1692(5) -0.0289(6) 0.1943(2) 1. 0 d
O2 O2- 36 f 0.2012(6) 0.1704(6) 0.0916(2) 1. 0 d
loop_
_atom_type_symbol
_atom_type_oxidation_number
Nb4+ 4.500
P5+ 5.000
O2- -2.000
