Browsing by Author "Petkov, V"

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    PbZr1-xTixO3 by soft synthesis: structural aspects
    (American Physical Society, 2007-07) Pradhan, SK; Gateshki, M; Niederberger, M; Ren, Y; Petkov, V
    The structural aspects of a soft synthetic route employed to obtain fine crystallite PbZr1−xTixO3 (x=0,0.5,1) powders are revealed by total x-ray diffraction and atomic pair distribution function analysis. It is found that the atomic-scale structure of the intermediate, highly disordered phase the route passes through resembles but is not exactly of the targeted, perovskite-type structure. It is suggested that future synthesis efforts are directed toward closing the observed “structure gap” as much as possible. © 2007, American Physical Society
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    Structure of nanosize materials by high-energy x-ray diffraction: study of titanate nanotubes
    (Oldenbourg Wissenschaftsverlag, 2007-11) Gateshki, M; Chen, Q; Peng, LM; Chupas, P; Petkov, V
    High-energy X-ray diffraction and atomic Pair Distribution Function analysis are employed to determine the atomic-scale structure of titanate nanotubes. It is found that the nanotube walls are built of layers of Ti-O6 octahedra simular to those observed in crystalline layered titanates. In the nanotubes, however, the layers are bent and not stacked in perfect registry as in the crystal. © 2007, Oldenbourg Wissenschaftsverlag