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PhD position in Dresden: First-principles studie ... (No replies)
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The Helmholtz-Zentrum Dresden-Rossendorf (HZDR, see http://www.hzdr.de) is a large multidisciplinary research center with more than 1100 employees and member of the Helmholtz Association of German Research Centers (Helmholtz-Gemeinschaft Deutscher Forschungszentren - HGF). The work of HZDR is focused on challenging topics in the HGF research areas Matter, Energy and Health.
A three-year PhD position (Registration-No. 45E/2016) is available at the Institute of Ion Beam Physics and Materials Research of HZDR. The salary is according to the German TV-ÖD.
Subject and aim of the work
Oxide Dispersion Strengthened (ODS) steels consist of an iron-based ferritic matrix with highly dispersed nanometer-size oxide particles containing mainly O, Y, and Ti. The detailed mechanisms of the formation and of the structure and composition of these nanclusters are still under debate. Compared to conventional steels ODS materials exhibit two remarkable properties that are not fully understood yet: (i) High-temperature stability: Up to more than 1000 K the number and size of the oxide nanoparticles do not change significantly. (ii) Radiation resistance: The nanoclusters can act as sinks for point defects (vacancies and self-interstitial atoms) and helium. The first property is the reason for the improved creep strength at high temperature, whereas the second property is related to the radiation tolerance or the self-healing behavior of these materials. Therefore, ODS alloys are promising candidates for applications as structural materials in extreme environments, i.e. at high temperature and/or particle irradiation, such as in advanced nuclear (fusion and fission) power plants.
In the framework of the PhD work first-principles calculations on the properties of Y-Ti-O nanoclusters in bcc Fe shall be performed. The goal of these studies is the better understanding of the structure, composition, and thermodynamics of the nanoparticles. In particular the conditions for the formation of nonstoichiometric clusters that are coherent with the bcc matrix and for the formation of separate oxide phases in bcc Fe shall be clarified. Furthermore, the interaction of the nanoparticles with point defects and helium shall be studied. The theoretical results shall be discussed in the context of available experimental data on the nanostructure and the irradiation resistance of ODS alloys.
Requirements
We are looking for a highly motivated candidate with team spirit, holding an university degree in physics or materials science (Diplomphysiker, Diplomingenieur or Master of Sciences), with at least a good overall grade, possessing a profound knowledge in solid-state physics, experience in application of computer programs and numerical methods related to physical topics and knowledge in programming as well as good oral and written proficiency in English.
Please send your application (in German or English), including CV, grade transcript and, possibly, letters of recommendation by July 31, 2016 (applications after this deadline may be considered if position is not filled already) via e-mail to:
Dr. Matthias Posselt, Email: [email protected] (Tel.: +49 351 260 3279)