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Local structure around Ga in ultrafine coaxial nanorod heterostructures
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Image of FIG. 1.
FIG. 1.

Normalized x-ray absorption coefficient from (a) powder and (b),(c) coaxial heterostructures as a function of incident x-ray energy at the Ga edge and . For the coaxial structures, the XAFS data were collected with the geometry of the axis aligned, (b) parallel and (c) perpendicular, to the electric field vector of the incident x rays.

Image of FIG. 2.
FIG. 2.

XAFS from powder (top) and from the aligned coaxial structures with thickness of 6 and for (2nd and 3rd) and (4th and 5th), as a function of the photoelectron wave vector, , where is the electron rest mass, is the incident photon energy and is the edge energy.

Image of FIG. 3.
FIG. 3.

Magnitude of Fourier transformed XAFS, from (a) powder and coaxial structures with an average thickness of for (b) and (c) , as a function of the distance from a Ga atom. For the Fourier transformation, a Hanning window with a window sill width of was used. Data in the range of were fitted.


Generic image for table
Table I.

Coordination number , bond length and Debye–Waller factor of powder and tubular were obtained with XAFS at . of 0.85(5) were determined from the fit to the powder data and fixed in the tubular data fits. For the model calculations, the WZ structure with , and the crystalline symmetry of nitrogen = 0.375 were used. For the ZB structure, the lattice constant of was used.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Local structure around Ga in ultrafine GaN∕ZnO coaxial nanorod heterostructures