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Structure analysis of Na 2 UI 6 by neutron powder diffraction
Author(s) -
Małetka K.,
Fischer P.,
Murasik A.,
Szczepaniak W.
Publication year - 1992
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889891007264
Subject(s) - bar (unit) , crystallography , rietveld refinement , neutron diffraction , group (periodic table) , structure type , chemistry , space group , crystal structure , powder diffraction , space (punctuation) , type (biology) , materials science , diffraction , x ray crystallography , physics , optics , ecology , linguistics , philosophy , organic chemistry , meteorology , biology
Based on investigations at 9 and 295 K, Na 2 UI 6 has been shown to crystallize in a new structure type corresponding to space group R , in contrast to ionic conductors of the type Na 2 U X 6 for X = Cl, Br which crystallize in the space group P m l. Atomic positions of sodium and iodine have been refined using the Rietveld profile fitting procedure. It was found that in space group R the U, Na and I atoms occupy positions 3( a ), 6( c ) and 18( f ), respectively. The relation between the Na 2 UCl 6 ‐type structure and the structure of Na 2 UI 6 is discussed.