Abstract
The vibrational properties Of WO3 ceramics in the 30-300 K temperature
range were probed by Raman spectroscopy. Starting with WO3 ceramics at
room temperature presenting monoclinic (V) and triclinic (VI) mixed
phases, structural transitions related to decreasing temperature were
observed. At low temperatures a monoclinic (VII) and a new mixed phase
were observed, the former characteristic Of WO3 bulk and the latter
associated to microcrystals. The analysis of the spectra indicated that
the new phase develops gradually and it comes mainly from the monoclinic
(V) phase. Copyright (C) 2001 John Wiley & Sons, Ltd.
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