Doctoral Dissertation “The Synthesis and Analysis of Metastable Metal Hydrides“

Author, institution: Rasa Žostautienė, Kaunas University of Technology

Science area, field: Physical Sciences, Physics

The Doctoral Dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas).

Scientific Supervisor: Dr. Darius Milčius (Lithuanian Energy Institute, Physical Sciences, Physics – 02P).

Board of Physics Science Field:

Prof. Dr. Habil. Arvaidas GALDIKAS (Kaunas University of Technology, Physical Sciences, Physics – 02P) – chairman;

Prof. Dr. Diana ADLIENĖ (Kaunas University of Technology, Physical Sciences, Physics – 02P);

Assoc. Prof. Dr. Mindaugas ANDRULEVIČIUS (Kaunas University of Technology, Physical Sciences, Physics – 02P);

Prof. Dr. Valdas ŠABLINSKAS (Vilnius University, Physical Sciences, Physics – 02P);

Dr. Vitas VALINČIUS (Lithuanian Energy Institute, Technology Science, Energy and Thermoengineering – 06T).

Official opponents:

Prof. Dr. Liutauras MARCINAUSKAS (Kaunas University of Technology, Physical Sciences, Physics – 02P);

Assoc. Prof. Dr. Saulius MICKEVIČIUS (Vytautas Magnus University, Physical Sciences, Physics – 02P).

Annotation:

The main aim of this work is using physical methods of obtaining materials to synthesize destabilize MgH₂ thin layer structures, which can be used in the future for hydrogen storage, smart windows systems and metal hydride – based batteries. The paper aims to use the technologies of hydrogen insertion at plasma into Mg/Mg-Ti thin films, optimizing the preparation of the Mg-Ti-H compounds, to use the porous structure of the Pt catalyst, to promote the decomposition of hydrogen molecules into atoms of Mg-Ti films surface and thereby accelerating the process of Mg-Ti hydrogenation.
The main focus of the work is directed to the influence of synthesis methods for changes in fundamental (surface topography, morphology, elemental composition, distribution of the individual elements into the volume, formation of crystallographic structures) properties of Mg-Ti-H materials.
It was used the new synthesis technologies in this work to avoid the influence of the surface layer (mainly braking hydrogen uptake from the surface to volume): hydrogen ion insertion into the Mg-Ti films by ion implantation of plasma technologies. Also Mg-Ti films obtained not as a “layer by layer” system, but it was used the simultaneous precipitation of Mg-Ti, keeping the proportions which are necessary to synthesize Mg₇TiH_x.