Nanocrystalline Materials: Synthesis and Properties

This project aims at the study of the structure and materials transport properties of nanocrystalline materials. Diffusion is a determining feature of a number of application-oriented properties of nanocrystalline materials, such as enhanced ductility, diffusion-induced magnetic anisotropy, enhanced ionic mass transport, and improved catalytic activity. In order to gain insight into structure-property relationships, the diffusion studies are combined with a comprehensive structural characterization including the techniques of x-ray diffraction and positron annihilation. Positron lifetime spectroscopy has proven a versatile tool for the study of interfacial structural free volumes and lattice vacancies in nanocrystalline materials. Chemical sensitivity is achieved by making use of coincident Doppler broadening measurements of the positron-electron annihilation photons. With this background reduced Doppler broadening new potentials emerge for a chemical characterization of structural complex materials on an atomistic scale.

Persons involved: Roland Würschum, Ulrich Brossmann

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Publications:

2016
Ulrich Brossmann, Mihaela Albu, Ferdinand Hofer and Roland Würschum Single grain analysis on a nanoscale in ZrO2:Al2O3 nano-composites by means of high-resolution scanning transmission electron microscopy Materials Research Express 3, 2016 , DOI Show publication in PURE
2012
Kashif Nadeem, Heinz Krenn, Thomas Traußnig, Roland Würschum, D.V. Szabo and Ilse Letofsky-Papst Spin-glass freezing of maghemite nanoparticles prepared by microwave plasma synthesis Journal of Applied Physics 111, 113911-113917, 2012 , DOI Show publication in PURE
2011
Martin Sagmeister, Markus Postl, Ulrich Brossmann, Emil List, Andreas Klug, Ilse Letofsky-Papst, Dorotheé Szabó and Roland Würschum Structure and electrical properties of nanoparticulate tungsten oxide prepared by microwave plasma synthesis Journal of Physics / Condensed Matter 23, 334206-1-334206-7, 2011 , DOI Show publication in PURE
Andreas Kautsch, Ulrich Brossmann, Heinz Krenn, Ferdinand Hofer, D.V. Szabo and Roland Würschum Structural and optical properties of nanoparticulate Y2O3:Eu2O3 made by microwave plasma synthesis Applied Physics / A 105, 709-712, 2011 , DOI Show publication in PURE