Blar i Institutt for materialteknologi på tittel
Viser treff 2113-2132 av 2519
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Stress Induced Problems in Himalayan Tunnels with Special Reference to Squeezing
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:20, Doctoral thesis, 2006)There is a huge potential of underground constructions in the Himalayan region for hydropower, transport systems and conservation of environment. However, the tectonic activities have resulted with a fragile regional ... -
Stress-strain relations for age hardened AlMgSi alloys, measured with necking corrections and modelled based on TEM characterization
(Doctoral theses at NTNU;2021:182, Doctoral thesis, 2021)Age hardening Al-Mg-Si(-Cu) alloys, like other aluminium alloys, are increasingly utilized due to the combination of cost-saving, easy fabrication, and good mechanical properties. Yield strength and work hardening are ... -
Structural and chemical stability of the hexagonal manganites
(Doctoral theses at NTNU;2017:252, Doctoral thesis, 2017)The link between atomic interactions and functional properties in the fascinating material system called hexagonal manganites is investigated in this thesis. By using both neutron scattering measurements and first principles ... -
Structural and electrochemical characterization of graphite materials for Li ion batteries
(Master thesis, 2012)The purpose of this study is to find a correlation between the crystallite sizes in thebasal plane direction of graphite materials, used in carbon anodes in Lithium-ionbatteries. Carbon anodes are the most common type of ... -
Structural Characterization of Natural Quartz by Scanning TEM
(Journal article; Peer reviewed, 2018)For quartz, despite its industrial importance and an extensive amount of research done on it, there are still open fundamental questions, e.g. regarding crystal defects, phase changes or damage mechanisms under ionizing ... -
Structural Disorder and Coherence across the Phase Transitions of Lead-Free Piezoelectric Bi0.5K0.5TiO3
(Journal article; Peer reviewed, 2018)Relaxor ferroelectrics exhibit superior properties for converting mechanical energy into electrical energy, and vice versa, but the structural disorder hampers an understanding of structure–property relationships and impedes ... -
Structural Dynamics Study of Hydration Shells on n-Ge(100) in Aqueous Solution with Electrochemical Control
(Chapter, 2016)Structural changes of the hydration shell of surfaces in aqueous solution are studied using attenuated total reflection infrared spectroscopy, under different electrode potentials and consequently different states of the ... -
Structural Evolution of Ferroelectric and Ferroelastic Barium Sodium Niobate Tungsten Bronze
(Peer reviewed; Journal article, 2020)The crystal structure of the ferroelastic and ferroelectric tungsten bronze Ba2NaNb5O15 (BNN) has been debated. Here, we re-examine the crystal structure of BNN by ambient powder X-ray diffraction combined with density ... -
Structural Evolution of Ferroelectric and Ferroelastic Barium Sodium Niobate Tungsten Bronze
(Peer reviewed; Journal article, 2020)The crystal structure of the ferroelastic and ferroelectric tungsten bronze Ba2NaNb5O15 (BNN) has been debated. Here, we re-examine the crystal structure of BNN by ambient powder X-ray diffraction combined with density ... -
Structural evolution of water and hydroxyl groups during thermal, mechanical and chemical treatment of high purity natural quartz
(Peer reviewed; Journal article, 2020)Fused silica crucibles are commonly used in the fabrication process of solar grade silicon ingots. These crucibles are manufactured from high purity natural quartz sand and as a consequence, their properties are influenced ... -
Structure and Optical Properties of Titania-PDMS Hybrid Nanocomposites Prepared by In Situ Non-Aqueous Synthesis
(Journal article; Peer reviewed, 2017)Organic-inorganic hybrid materials are attractive due to the combination of properties from the two distinct types of materials. In this work, transparent titania-polydimethylsiloxane hybrid materials with up to 15.5 vol. ... -
Structure and phase transitions in 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) from -100 degrees C to 150 degrees C
(Journal article; Peer reviewed, 2013)The solid solution of (x)Ba0.7Ca0.3TiO3-(1-x)BaZr0.2Ti0.8O3 is known to exhibit high piezoelectric constants. Discrepancies in the reported phase transitions and structure around room temperature, however, have complicated ... -
Structure and phase transitions of A2MBr4 supramolecular crystals where A=[N(CH3)4] and/or [N(C2H5)4] and M= Zn or Mn
(Master thesis, 2021)Behovet for mindre, mer bærekraftige og elastiske elektriske innretninger har økt interessen for å finne erstatninger for konvensjonelle ferroelektriske materialene som ofte er sprø og har en lite energieffektiv produksjon. ... -
Structure Control of Multicrystalline Silicon
(Doctoral thesis at NTNU;2016:65, Doctoral thesis, 2016)This work targets multiple approaches for controlling the initial growth conditions of directional solidification, and their effect on the final material microstructure and performance. Challenges related to both seeded ... -
Structure, disorder, and oxygen vacancies in ferroelectric tetragonal tungsten bronzes
(Doctoral theses at NTNU;2020:349, Doctoral thesis, 2020)Ferroelectric materials are widely used materials in electronics due to their spontaneous and switchable polarization. The most common ferroelectric material on the market today is the lead-based perovskite PbZr1-xTixO3 ... -
Structure, electrical conductivity and oxygen transport properties of perovskite-type oxides CaMn1−x−yTixFeyO3−δ
(Journal article; Peer reviewed, 2019)Calcium manganite-based perovskite-type oxides hold promise for application in chemical looping combustion processes and oxygen transport membranes. In this study, we have investigated the structure, electrical conductivity ... -
The Structure, Morphology, and Complex Permittivity of Epoxy Nanodielectrics with in Situ Synthesized Surface-Functionalized SiO2
(Peer reviewed; Journal article, 2021)Epoxy nanocomposites have demonstrated promising properties for high-voltage insulation applications. An in situ approach to the synthesis of epoxy-SiO2 nanocomposites was employed, where surface-functionalized SiO2 (up ... -
Structure, Selectivity and Electrocatalytic Activity of Iridium-Based Oxides for Oxygen Evolution
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:124, Doctoral thesis, 2014)Iridium dioxide-based electrocatalysts were chosen as main object of the study because these materials are well-known in electrochemical technology as active and durable in a number of anodic reactions. However, some ... -
Structure, stability and phase transitions of multiferroic BiFeO3
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:118, Doctoral thesis, 2009) -
Structure-Property Relations of Reduced MoO3
(Doctoral thesis at NTNU;2016:190, Doctoral thesis, 2016)Molybdenum oxide is an important component in many technological applications. Its unusually high work function coupled with its transparency make it valuable in optoelectronic devices such as photovoltaic cells and light ...