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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Heterogeneity and Disorder in Ti_(1-x)Fe_yO_(2-d)/ Nanocrystal Rutile-Based Flowerlike Aggregates: Detection of Anatase
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Heterogeneity and Disorder in Ti_(1-x)Fe_yO_(2-d)/ Nanocrystal Rutile-Based Flowerlike Aggregates: Detection of Anatase

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Here we report results of systematic investigation of heterogeneity and disorder in Ti_(1-x)Fe_yO_(2-d)nanorod rutile-based flowerlike aggregates. It was found that Ti_(1-x)Fe_yO_(2-d) aggregates are composed of two crystalline phases: rutiie as a dominant and anatase as a minor phase. Flowerlike aggregates were found to grow from an isometric core ca. 5-10 nm in diameter that was built from anatase and rutile nanorods ca. 5 x 100 nm that were grown on the anatase surface having base plane (001) intergrowth with an anatase plane. The direction of rutiie nanorods growth, i.e., direction of the nanorod elongation, was 001. Highly nonisometric rutiie crystals produce anisotropic X-ray powder diffraction line broadening and doubling of vibrational bands in Raman spectra. Both these techniques confirmed nonisometric character of rutiie crystals and gave a quantitative measure of crystal shape anisotropy in excellent agreement with high-resolution transmission electron microscopy measurements. In addition, from the atomic pair distribution function and Raman spectral analyses the level of vacancy concentration was determined in rutiie and anatase phases of investigated samples.

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