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3 results on '"Te-Horn Tu"'

1. X-ray diffraction and absorption spectroscopy studies of the structure of self-assembled FePt nanoparticles during annealing

Author

Te-Horn Tu, Chih-Hao Lee, Tzu-Wen Huang, and Yen-Heng Huang

Subjects
Diffraction, Materials science, Absorption spectroscopy, Annealing (metallurgy), Superlattice, Analytical chemistry, Nanoparticle, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Nuclear magnetic resonance, K-edge, Absorption edge, X-ray crystallography
Abstract

The superlattice structures and coalescence of self-assembled FePt nanoparticles were studied by X-ray diffraction and absorption spectroscopy techniques. The as-synthesized superlattice structure was found to be an FCC-like one with 21±0.5 well-packed layers. During the annealing, the iron absorption K edge was found shifted to a higher energy as the annealing temperature increase. The shift of this iron K edge might be attributed to the quantum size effect, surface effect or oxidation effect.

Published
2004

2. X-ray scattering and absorption spectroscopy study of the order-disorder transition of (FePt)/sub 1-x/Cu/sub x/ nanoparticles

Author

Te-Horn Tu, Chih-Ming Lin, Chih-Hao Lee, Yen-Heng Huang, and Tzu-Wen Huang

Subjects
X-ray absorption spectroscopy, Materials science, Absorption spectroscopy, Transition temperature, Thermal decomposition, Analytical chemistry, chemistry.chemical_element, Copper, Electronic, Optical and Magnetic Materials, Nuclear magnetic resonance, chemistry, X-ray crystallography, Electrical and Electronic Engineering, Platinum, Powder diffraction
Abstract

(FePt)/sub 1-x/Cu/sub x/ nanoparticles were prepared by the simultaneous polyol reduction of platinum acetylacetonate and copper acetylacetonate, and the thermal decomposition of Fe carbonyl. The addition of copper reduces the transition temperature of disordered fcc structure to ordered L1/sub 0/ by about 50/spl deg/C-100/spl deg/C. Together with the X-ray powder diffraction (XRD) and X-ray absorption spectroscopy (XAS) results, the structure of FePtCu ternary alloy was verified and the Fe site was replaced by Cu.

Published
2005

3. X-Ray Scattering and Absorption Spectroscopy Study of the Order-Disorder Transition of (FePt)1xCux Nanoparticles.

Author

Tzu-Wen Huang, Te-Horn Tu, Yen-Heng Huang, Chih-Hao Lee, and Chih-Ming Lin

Subjects
*ABSORPTION, *SPECTRUM analysis, *NANOPARTICLES, *X-ray scattering, *TERNARY alloys, *CHEMICAL systems
Abstract

(FePt)1 - x Cux nanoparticles were prepared by the simultaneous polyol reduction of platinum acetylacetonate and copper acetylacetonate, and the thermal decomposition of Fe carbonyl. The addition of copper reduces the transition temperature of disordered fcc structure to ordered L10 by about 50 °C-100 °C. Together with the X-ray powder diffraction (XRD) and X-ray absorption spectroscopy (XAS) results, the structure of FePtCu ternary alloy was verified and the Fe site was replaced by Cu. [ABSTRACT FROM AUTHOR]

Published
2005
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