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《Acta Physica Sinica》 1994-04
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ANOMALOUS INFRARED VIBRATIONS OF NANOMETER- SIZED Fe_2O_3 PARTICLES

Wu XIAO-CHUN Zou BING-SUO Yu BAO-LONG TANG GUO-QING ZHANG GUI-LAN CHEN WEN-IUInstituse of Modern Optics, Nankai University, Tiaajin 300071  
This paper reports the anomalous infrared spectra of nanometer-sized Fe2O3particles 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.
【CateGory Index】: O488
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