Tobias Staab

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For a detailed understanding of high-temperature processes in complex solids the identification of the sublattice on which thermal defects are formed is of basic interest. Theoretical studies in intermetallic compounds favor a particular sublattice for thermal vacancy formation. In the present study we detect in ordered MoSi2 thermal vacancies with a low(More)
Rights: © 1999 American Physical Society (APS). This is the accepted version of the following article: Gebauer, J. & Lausmann, M. & Staab, T. E. M. & Krause-Rehberg, R. & Hakala, M. & Puska, Martti J. 1999. Microscopic identification of native donor Ga-vacancy complexes in Te-doped GaAs. Physical Review B. Volume 60, Issue 3. 1464-1467. ISSN 1550-235X(More)
To investigate the lattice distortion caused by point defects in As-rich GaAs, we make use of a self-consistent-charge density-functional based tight-binding method. Both relevant defects, the As antisite and the As interstitial, cause significant lattice distortion. In contrast to As interstitials, isolated As antisites lead to lattice strain as well as(More)
To investigate the early stages of nucleation and growth of As precipitates in GaAs grown at low substrate temperature, we make use of a self-consistent-charge density-functional based tight-binding method. Since a pair of As antisites already shows a significant binding energy which increases when more As antisites are attached, there is no critical(More)
To provide efficient and flexible material transport, inplant milk-run systems are used by many companies. However, the large number of influencing factors makes in-plant milk-run systems complex, while dependencies and blockages, e.g. overtaking or stopping, require a dynamic approach to examination. Thus we developed a generic simulation model focusing on(More)
Bismuth sodium titanate (Bi(0.5)Na(0.5))TiO(3) (BNT) is considered to be one of the most promising lead-free alternatives to piezoelectric lead zirconate titanate (PZT). However, the effect of dopants on the material has so far received little attention from an atomic point of view. In this study we investigated the effects of cobalt-doping on the formation(More)
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