Browsing Institutt for materialteknologi by Issue Date
Now showing items 441-460 of 2540
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The Effect of Alloying Elements on the Ductility of Al-Mg-Si Alloys
(Master thesis, 2014)Experiments were conducted to attempt to understand the effect of different alloying elements on the ductility of Al-Mg-Si alloys. Four alloys with different concentrations of Si, Mg, Fe, Mn and Cu were selected for ... -
Oxygen Non-Stoichiometry and Electrical Conductivity of La0.2Sr0.8Fe0.8B0.2O3 − δ, B = Fe, Ti, Ta
(Journal article; Peer reviewed, 2014)The oxygen non-stoichiometry was determined by coulometric titration for the perovskite oxides La0.2Sr0.8FeO3 − δ and La0.2Sr0.8Fe0.8B0.2O3 − δ (B = Ti4 + and Ta5 +) in the temperature range 600 °C ⩽ T ⩽ 900 °C and the ... -
The effects of quench rate and pre-deformation on precipitation hardening in Al–Mg–Si alloys with different Cu amounts
(Journal article, 2014)The effects of quench rate after solution heat treatment in combination with 1% pre-deformation on precipitation hardening in three Al–Mg–Si alloys have been investigated by transmission electron microscopy and hardness ... -
Wet chemical synthesis of silicon nanoparticles and phosphorescent oxides for white light emitting diodes
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:209, Doctoral thesis, 2014) -
Development of Rare Earth Metal Iron Oxides as Mixed Ionic and Electronic Conductors
(Master thesis, 2014)In recent years there has been an increasing interest in finding a new and less energy demanding alternative to cryogenic distillation in the production of pure oxygen gas. The use of oxygen permeable membranes has been ... -
Deposition of silica nanoparticles onto alumina measured by optical reflectometry and quartz crystal microbalance with dissipation techniques
(Journal article; Peer reviewed, 2014)Understanding of the interactions between particles and the substrate is important for successful sol–gel deposition of thin films. We have studied the deposition of silica nanoparticles on alumina coated surfaces in aqueous ... -
Hydrophobic Coatings for Anti-Icing Applications
(Master thesis, 2014)The motivation for developing environmentally friendly and inexpensive solutions for anti-icing is high. The oil industry is heading toward arctic regions and the development of improved anti-icing techniques demands greater ... -
Alternative Methods for Curing of TCO Thin Films
(Master thesis, 2014)Transparent conducting oxides have a unique combination of properties as they are both optical transparent in the visible region of the electromagnetic spectrum, and obtain a near-metallic conductivity. This makes them ... -
Improved Induced Diode Photodetectors by Increased Fixed Charge in PECVD Amorphous Silicon Nitride
(Master thesis, 2014)The predictable quantum efficient detector (PQED) is a cheaper, more practical alternative to the current radiometric primary standard, the cryogenic radiometer. The PQED is made of an induced diode, a rectifying junction ... -
Solution based synthesis of Si quantum dots and down-shifting layers for solar cell applications
(Doctoral thesis at NTNU, Doctoral thesis, 2014)Silicon is the main component of electronics and photovoltaics, but since bulk Si is a poor light emitter it cannot be adapted into opto-electronic devices and applications. Si nano-crystals on the other hand have ... -
Subgrain structures characterized by electron backscatter diffraction (EBSD)
(Journal article; Peer reviewed, 2014)Subgrain structures are frequently characterized by the electron backscatter diffraction (EBSD) method, which is both accurate and provides good statistics. This is essential to better understand the subgrain growth ... -
Karakterisering av deformasjonstvillinger i dupleks rustfritt stål
(Master thesis, 2014)Dannelse av deformasjonstvillinger i dupleks rustfrie stål har blitt viet lite oppmerksomhet til nå. I denne masteroppgaven har deformasjon blitt introdusert gjennom mekanisk testing for å fremprovosere tvillingdannelse i ... -
Rayleigh analysis of dielectric properties in textured K0.5Na0.5NbO3 ceramics
(Journal article; Peer reviewed, 2014)Grain texturing is a known method of exploiting the intrinsic dielectric and piezoelectric anisotropy in ferroelectric ceramics. However, the role of crystallographic texture on anisotropic extrinsic contributions including ... -
Modeling of electrochemical and photoelectrochemical impedance functions for films
(Master thesis, 2014)The aim of this study was to develop mathematical models for electrochemical and photoelectrochemical impedance transfer functions for mixed conducting films. These models include electrochemical impedance spectroscopy ... -
On the Effect of A to B Stoichiometry Variation on Conductivity and Phase Purity in 0.8BiFeO3-0.2Bi0.5K0.5TiO3: Development of Lead-Free Ferroelectric Materials
(Master thesis, 2014)Piezoelectric materials are currently widely used in both electronics and transducer applications. Today, the majority of these units are based on the lead containing material system PZT, and release of lead to the environment ... -
An explicit integration scheme for hypo-elastic viscoplastic crystal plasticity
(Journal article; Peer reviewed, 2014)An explicit integration scheme for rate-dependent crystal plasticity (CP) has been developed in this work. Additive decomposition of the velocity gradient tensor into lattice and plastic parts is adopted for describing the ... -
Asymmetric supported dense lanthanum tungstate membranes
(Journal article; Peer reviewed, 2014)In this work, a colloidal processing route for dense asymmetric La28-xW4+xO54+3x/2 membranes for hydrogen gas separation applications was established. Dip coating process conditions were optimized to obtain ≈20 m thick ... -
Dynamic electrochemical impedance spectroscopy, for electrocatalytic reactions
(Journal article; Peer reviewed, 2014)Dynamic electrochemical impedance spectroscopy with the ac signal applied while sweeping the potential is a powerful method to study reaction mechanisms of surface electrochemical reactions. The ability to reliably measure ... -
Carbon-polymer composite coatings for PEM fuel cell bipolar plates
(Journal article; Peer reviewed, 2014)A carbon-polymer composite coating on stainless steel 316L substrates was investigated for the use as bipolar plate material for polymer electrolyte membrane fuel cells. The coating consisted of 45 vol% graphite, 5 vol% ... -
Silicon directional solidification Impurity segregation and defects
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:161, Doctoral thesis, 2014)