Browsing Fakultät für Physik (inkl. GAUSS) by Advisor "Pundt, Astrid Prof. Dr."
Now showing items 1-10 of 10
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Critical thicknesses in Nb-H thin films: coherent and incoherent phase transitions, change of precipitation and growth modes and ultrahigh mechanical stress
(2016-08-03)For nanoscale systems such as Me-H thin films, changes of physical properties have been suggested to appear below certain critical sizes. The probable existence of these critical sizes and the related changes of thermodynamical ... -
Dünne Palladium-Wasserstoff-Schichten als Modellsystem: Thermodynamik struktureller Phasenübergänge unter elastischen und mikrostrukturellen Zwangsbedingungen
(2015-07-07)Using the formation of a hydride phase in palladium-hydrogen thin films with 5 nm to 2000 nm thickness as a model, this work investigates the impact of film thickness as well as microstructural and elastic constraints on ... -
Extended TOF-SIMS analysis on low-nickel austenitic stainless steels: The influence of oxide layers on hydrogen embrittlement
(2016-01-18)Hydrogen embrittlement (HE) of low-nickel austenitic stainless steels were studied with special attention to the impact of the microstructural properties such as strain induced α’-martensite, grain size, dislocation density ... -
Hydrogen absorption property of nanocrystalline-magnesium films
(2016-11-07)The purpose of this study is to investigate hydrogen absorption properties of grain boundary rich pure magnesium film. X-ray diffraction (XRD) measurements has been carried out to estimate microstructures, texture, lattice ... -
Hydrogen diffusion and hydride formation in grain boundary rich magnesium
(2019-05-06)In the last decade Magnesium (Mg) has attracted much interest as a storage material for hydrogen in a future hydrogen energy based economy. The reasons are its high reversible hydrogen capacity of up to 7,6 wt% and its ... -
Hydrogen in V-Fe thin films and Fe/V-Fe multi-layered thin films
(2011-11-25)In this thesis, hydrogen induced biaxial stress and local distribution of hydrogen in V-Fe films and V-Fe/Fe multi-layered films were investigated. The stress development and stress relaxation ... -
In situ studies on palladium/rutile titanium dioxide exposed to low pressure hydrogen gas environments
(2018-11-12)The interaction of hydrogen gas with the palladium/rutile titanium dioxide model system was investigated with strong focus on the interface and its vicinity. Palladium (Pd) films were deposited on pretreated rutile titanium ... -
Interlayer effect on the hydrogen uptake in Vanadium films: Stress development, surface topography and optical behavior changes
(2023-07-13)The purpose of this study is to investigate hydrogen absorption-related properties changes of nanocrystalline thin films by varying the elastic constraints condition. The elastic constraint condition is varied by using ... -
Spannungen, Dehnungen und Lage der Phasengrenzen in dünnen Nb- und Y-Schichten bei Wasserstoffbe- und -entladung
(2002-07-17)In this work the influence of the stresses induced by hydrogen loading on the position of phase boundaries in niobium and yttrium thin films is studied. The films were loaded with hydrogen ... -
Wasserstoffabsorption in epitaktischen Niobschichten: eine STM-Studie
(2007-02-19)In this work the phase transition of the system Niobium Hydrogen in thin films was investigated. The epitaxial Niobium films were fabricated using ion sputtering on sapphire substrates. The ...