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Raman spectroscopy of bismuth tungstates
Author(s) -
Hardcastle Franklin D.,
Wachs Israel E.
Publication year - 1995
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250260604
Subject(s) - tungstate , raman spectroscopy , bismuth , phase (matter) , materials science , analytical chemistry (journal) , chemistry , optics , physics , metallurgy , chromatography , organic chemistry
Abstract The Bi 2 O 3 ‐WO 3 system was examined using Raman spectroscopy. The Raman spectra of bismuth tungstate samples having Bi: W ratios of 2:1, 4:1 and 14:1 were used to identify the bismuth tungstate phases present at these compositions. The bismuth tungstate phases which occur were found to depend on the Bi: W ratio. The 2:1 composition consists of only the Bi 2 WO 6 phase and the 14:1 composition consists almost entirely of the sillenite phase. The 4:1 composition, however, is multi‐phase and consists of Bi 2 WO 6 , the sillenite phase, and another phase referred to as 7Bi 2 O 3 ‐2WO 3 . The Raman spectra were used to determine the coordination of the tungstate species as well as their WO bond lengths in each of these phases.