Nanocrystalline alkaline earth titanates and their electrical conductivity characteristics under changing oxygen ambient...
Germany
Corrosion behaviour of steels in oxygen containing, liquid Pb55,5%Bi considering surface modification / Korrosionsverhal...
Das Konzept des ADS (accelerator driven system) zur Transmutation von Aktiniden und Transuranen besteht aus der Kombination einer unterkritischen Spaltanordnung und einer beschleunigergetriebenen Spallations-Neutronenquelle. Als Spallationstarget und Kuehlmittel ist fluessiges Blei bzw. eine Blei-Wismut Legierung vorgesehen. Um einen Dauerbetrieb z...
TG-rig tests (Thermal Balance) on the oxidation of B_4C Basic experiments, Modelling and evaluation approach
In the frame of a separate-effects test program extensive studies on the oxidation of boron carbide using a thermal balance testing system (thermo-gravimetry TG) were performed. The test series included besides the oxidation tests on B_4C, also examinations on B_4C oxidation related compounds (e.g. B_2O_3). The evaluation and interpretation of the ...
Low temperature silicon epitaxy: defects and electronic properties
Germany
Study of the formation of defects and the diffusion kinetics on III-V semiconductor surfaces by means of the high-temper...
The kinetic of formation and diffusion of defects in (110) cleavage surfaces of III-V semiconductors is investigated by high temperature scanning tunneling microscopy as a function of temperature and dopant concentration. One point of main interest is the formation of phosphorus vacancies. It is shown that the measured rate of formation is given by...
Plastic behavior of quasicrystals and related intermetallic phases
In the present work, the plasticity of quasicrystals, metallic glasses and structurally complex alloy phases was investigated. The concepts of plasticity for simple crystalline materials cannot be applied to these materials without substational modification. Plastic deformation experiments and subsequent microstructural investigations by means of t...
Korrosionsverhalten von Staehlen in sauerstoffbeladenem, fluessigem Pb55,5%Bi unter Beruecksichtigung von Oberflaechenmo...
Germany
Plastic behavior of quasicrystals and related intermetallic phases
Germany
Bestimmung der kritischen Felder von oberflaechen- und temperaturbehandeltem Niob durch Wechselfeld-Suszeptometrie
Germany
Microcrystalline silicon solar cells prepared by 13.56 MHz PECVD Prerequisites for high quality material at high growth ...
Topic of this thesis was the development of thin film solar cells based on microcrystalline silicon prepared by 13.56 MHz PECVD (plasma-enhanced chemical vapor deposition) at high deposition rates. Comprehensive solar cell studies, which were accompanied by material studies, resulted in the identification of the most important prerequisites for hig...
