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Soft‐Chemistry Synthesis and Characterization of Bismuth Oxyfluorides and Ammonium Bismuth Fluorides
Author(s) -
Bervas M.,
Yakshinskiy B.,
Klein L. C.,
Amatucci G. G.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00721.x
Subject(s) - chemistry , bismuth , inorganic chemistry , aqueous solution , orthorhombic crystal system , inert gas , ammonium , nuclear chemistry , crystal structure , organic chemistry
Two bismuth oxyfluorides, BiOF and BiO 0.5 F 2 , have been prepared by soft chemistry. These two compounds are of interest for application as new type of positive electrode active materials in secondary lithium battery. BiOF was obtained directly from the fluorination of Bi 2 O 3 by a saturated aqueous solution of NH 4 F. BiO 0.5 F 2 was obtained by the hydrolysis of β‐NH 4 BiF 4 at 70°C. The ammonium bismuth fluoride β‐NH 4 BiF 4 , which is a new orthorhombic form of NH 4 BiF 4 , was obtained by reacting BiF 3 in a saturated aqueous solution of NH 4 F. Two other ammonium bismuth fluorides, (NH 4 ) 0.5 BiF 3.5 and NH 4 Bi 3 F 10 , were also prepared by annealing β‐NH 4 BiF 4 at a relatively low temperature under inert atmosphere. The existence of the fluorite (NH 4 ) 0.5 BiF 3.5 is reported for the first time in this paper.