Search for dissertations about: "transition metal carbide"

Showing result 11 - 15 of 41 swedish dissertations containing the words transition metal carbide.

  2. 11. Low-temperature deposition of epitaxial transition metal carbide films and superlattices using C60 as carbon source

    Author : Hans Högberg; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; fullerene; transition metals; carbides; low-temperature epitaxy; superlattices; Kemi; Chemistry; Kemi; Inorganic Chemistry; oorganisk kemi;

    Abstract : The transition metal carbides are chemical compounds with a unique set of propertiesused in many thin film applications. In this work, thin films of group 4-5 transitionmetal carbides and superlattices were deposited at low temperatures by simultaneousevaporation of C60 using either metal e-beam evaporation or d.c. magnetron sputtering. READ MORE

  4. 12. A Theoretical Perspective on the Chemical Bonding and Structure of Transition Metal Carbides and Multilayers

    Author : Mikael Råsander; Olle Eriksson; Biplab Sanyal; Risto Nieminen; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Electronic structure; transition metal carbides; density functional theory; disorder; multilayers; chemical bonding; materials science; Condensed matter physics; Kondenserade materiens fysik; Materialvetenskap; Materials Science;

    Abstract : The present thesis deals with a theoretical description of issues regarding chemical bonding, structure and stability of transition metal carbides and multilayered structures. First principles density functional theory has been used extensively to investigate the properties of alloyed solutions of transition metal carbides. READ MORE

  5. 13. Investigation of compositionally complex refractory metal based thin films

    Author : Barbara Osinger; Erik Lewin; Ulf Jansson; Sebastian Siol; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Magnetron sputtering; Thin films; High entropy materials; Refractory metals; Transition metal carbides; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Abstract : The search for new and improved materials has led to the discovery and establishment of compositionally complex or high-entropy materials. The work in this thesis is focused on the investigation of new compositionally complex materials based on the refractory metals of groups 4-6. READ MORE

  6. 14. Microstructure and Mechanical Properties of Magnetron Sputtered Refractory Metal Thin Films

    Author : Stefan Fritze; Ulf Jansson; Erik Lewin; Petr Vasina; Uppsala universitet; []
    Keywords : thin films magnetron sputtering; refractory metals; high entropy alloys; mechanical properties; transition metal carbides; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Abstract : The design and development of new multifunctional materials that exhibit a combination of high hardness and ductility, as well as a high corrosion resistance and thermal stability, is one of the key challenges in the field of material science. The focus of this thesis is on the development of novel multifunctional magnetron sputtered CrNbTaTiW–C based thin films. READ MORE

  7. 15. Silicon-Carbide-Based High-Voltage Submodules for HVDC Voltage-Source Converters

    Author : Keijo Jacobs; Hans-Peter Nee; Staffan Norrga; Marc Hiller; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Silicon carbide; HVDC converters; voltage source converters; modular multilevel converters; submodule topologies; metal-oxide-semiconductor field-effect transistor MOSFET ; insulated-gate bipolar-transistor IGBT ; power semiconductor devices; high-voltage; Electrical Engineering; Elektro- och systemteknik;

    Abstract : In order to transition to renewable energy sources and simultaneously meet the increasing demand for electrical energy, highly flexible and efficient grids are required. High-voltage direct-current (HVDC) transmission and grids are foreseen to be a vital part of the future electricity grid. READ MORE