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Size dependence of the Raman spectra in an amorphous–nanocrystalline mixed phase: the glacial state of triphenyl phosphite
Author(s) -
Hédoux Alain,
Guinet Yannick,
Descamps Marc
Publication year - 2001
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.725
Subject(s) - supercooling , raman spectroscopy , nanocrystalline material , amorphous solid , isothermal process , atmospheric temperature range , phase (matter) , materials science , analytical chemistry (journal) , thermodynamics , mineralogy , chemistry , crystallography , organic chemistry , optics , physics
Raman scattering investigations on triphenyl phosphite, performed in both the low‐ and high‐wavenumber ranges, provide a detailed description of the glacial state. The latter can be described as a two‐phase (amorphous–nanocrystalline) system if it is prepared by isothermal aging in the 210–222 K temperature range. From two different procedures the nanocrystalline volume fraction can be determined in glacial states prepared in the above temperature range. The Raman spectra in the range 840–1640 cm −1 reveals that T a = 224 K is a critical temperature from which the supercooled liquid isothermally transforms into a microstructure rather than nanocrystallized domains. In this case the volume of the non‐transformed supercooled liquid remaining in the intergranular space was estimated with respect to the volume of crystallized matter. Copyright © 2001 John Wiley & Sons, Ltd.