Open AccessANOMALOUS INFRARED VIBRATIONS OF NANOMETER- SIZED Fe2O3 PARTICLES
Author(s) -
Xiaochun Wu,
Bing-Song Zou,
Biao Yu,
Guiqian Tang,
Guilan Zhang,
Wenju Chen
Publication year - 1994
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.43.604
Subject(s) - infrared , nanometre , materials science , absorption (acoustics) , infrared spectroscopy , phonon , spectral line , coupling (piping) , molecule , absorption spectroscopy , condensed matter physics , molecular physics , phase (matter) , physics , optics , quantum mechanics , metallurgy , composite material , astronomy
This paper reports the anomalous infrared spectra of nanometer-sized Fe2O3 particles under certain conditions: some IR absorption peaks obviously shift, theirrelative intensities are changed; all peaks are remarkably broadened; and a broadbackground-absorption band appears. It is suggested that these anomalous IR chac-teristics indicate thata structural phase transition occurs, which results from the polaronic effect due to the increasing of electron-phonon coupling. This effect not only contains the contribution of LO phonons, but also the contribution of softmodes produced by interfacial atoms or molecules.