ANOMALOUS INFRARED VIBRATIONS OF NANOMETER- SIZED Fe2O3 PARTICLES | Zendy

Xiaochun Wu | Zendy; Bingsuo Zou | Zendy; Baolong Yu | Zendy; Guoqing Tang | Zendy; Guilan Zhang | Zendy; Wenju Chen | Zendy

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ANOMALOUS INFRARED VIBRATIONS OF NANOMETER- SIZED Fe2O3 PARTICLES

Author(s) -

Xiaochun Wu,

Bingsuo Zou,

Baolong Yu,

Guoqing Tang,

Guilan Zhang,

Wenju Chen

Publication year - 1994

Publication title -

acta physica sinica

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.

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