Heterogeneity and Disorder in Ti{1-x}Fe{y}O{2-d) Nanocrystal Rutile-based Flower Like Aggregates: Detection of Anatase
Here we report results of systematic investigation of heterogeneity and disorder in Ti{sub 1-x}Fe{sub y}O{sub 2-d} nanorod rutile-based flowerlike aggregates. It was found that Ti{sub 1-x}Fe{sub y}O{sub 2-d} aggregates are composed of two crystalline phases: rutile 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 rutile nanorods growth, i.e., direction of the nanorod elongation, was [001]. Highly nonisometric rutile crystals produce anisotropic X-ray powder diffraction line broadening and doubling of vibrational bands in Raman spectra. Both these techniques confirmed nonisometric character of rutile 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 rutile and anatase phases of investigated samples.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- DOE - OFFICE OF SCIENCE
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1019518
- Report Number(s):
- BNL-94536-2011-JA; R&D Project: PO-011; KC0202010; TRN: US1103660
- Journal Information:
- Journal of Physical Chemistry C, Vol. 115, Issue 11; ISSN 1932-7447
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
DETECTION
DIFFRACTION
DISTRIBUTION FUNCTIONS
ELONGATION
FLOWERS
LINE BROADENING
RAMAN SPECTRA
RUTILE
SHAPE
TRANSMISSION ELECTRON MICROSCOPY
VIBRATIONAL STATES
rutile crystals
anisotgropic x-ray power diffraction
Raman spectra