Premium
Amorphous to crystalline transformation in Ta 2 O 5 studied by Raman spectroscopy
Author(s) -
Joseph C.,
Bourson P.,
Fontana M. D.
Publication year - 2012
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.3142
Subject(s) - raman spectroscopy , amorphous solid , microelectronics , phonon , materials science , annealing (glass) , spectroscopy , chemical physics , amorphous semiconductors , analytical chemistry (journal) , nanotechnology , crystallography , chemistry , optics , condensed matter physics , physics , composite material , organic chemistry , quantum mechanics
Many of the interesting properties that make Ta 2 O 5 a strategic material for current and future applications in chemistry, microelectronics and optics, depend on its structural characteristics. In this work, we use Raman spectroscopy to probe structural modifications in amorphous Ta 2 O 5 coatings submitted to thermal annealing. On the basis of previous knowledge on the crystalline material, we perform Raman spectrum simulations in disordered and partially ordered Ta 2 O 5 from a phonon density of states. Calculated spectra are in good agreement with complex experimental spectra. Our original approach allows assignment of the vibrational features of the amorphous material, and quantitative interpretation of observed structural modifications in terms of ordering scales. In addition, it provides numerical indicators to analyse amorphous to crystalline phase transformation. Copyright © 2012 John Wiley & Sons, Ltd.