FTIR analysis of well-defined α-Fe2O3 particles

Yinsheng Wang, Atsushi Muramatsu, Tadao Sugimoto

研究成果: Article査読

152 被引用数 (Scopus)

抄録

The FTIR spectra of well-defined hematite (α-Fe2O3) particles varying in size, shape and internal structure have systematically been analyzed. It has been found that the absorption peak frequencies of the pseudocubic particles are located between the corresponding theoretical peak frequencies of spheres and cubes and shift to lower frequencies as particle size increases, corresponding approximately with the Mie theory. However, the basic spectrum pattern was determined by the morphology of the particles. The observation of ellipsoids with various aspect ratios revealed some essential discrepancies in the peak frequency between experiment and the theory on the surface phonon modes in small particles, even if the particles were completely dispersed in the medium. The internal structure mainly affects the peak width, which increases with the decreasing subcrystal size. Finally, the effects of aggregation on the IR spectrum are discussed.

本文言語English
ページ(範囲)281-297
ページ数17
ジャーナルColloids and Surfaces A: Physicochemical and Engineering Aspects
134
3
DOI
出版ステータスPublished - 1998 3月 31

ASJC Scopus subject areas

  • 表面および界面
  • 物理化学および理論化学
  • コロイド化学および表面化学

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