Browsing Institutt for materialteknologi by Title
Now showing items 728-747 of 2509
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Electrical conductivity and thermopower of (1-x) BiFeO3 - xBi(0.5)K(0.5)TiO(3) (x=0.1, 0.2) ceramics near the ferroelectric to paraelectric phase transition
(Journal article; Peer reviewed, 2015)Ferroelectric BiFeO3 has attractive properties such as high strain and polarization, but a wide range of applications of bulk BiFeO3 are hindered due to high leakage currents and a high coercive electric field. Here, we ... -
Electrical Fatigue Behavior of Ba0. 85Ca0. 15Zr0. 1Ti0. 9O3 Ceramics Under Different Oxygen Concentrations
(Peer reviewed; Journal article, 2020)Fatigue degradation is a significant problem in piezo/ferroelectric materials and their commercial applications. The major causes of electrical fatigue degradation are a domain pinning effect and physical damage such as ... -
Electrical fatigue behavior of Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramics under different oxygen concentrations
(Peer reviewed; Journal article, 2021)Fatigue degradation is a significant problem in piezo/ferroelectric materials and their commercial applications. The major causes of electrical fatigue degradation are a domain pinning effect and physical damage such as ... -
Electrical half-wave rectification at ferroelectric domain walls
(Journal article; Peer reviewed, 2018)Domain walls in ferroelectric semiconductors show promise as multifunctional two-dimensional elements for next-generation nanotechnology. Electric fields, for example, can control the direct-current resistance and reversibly ... -
Electrical Resistivity in Carbon Materials Converting to SiC
(Master thesis, 2020)Målet med dette arbeidet har vært å undersøke hvordan ledningsevnen i karbonmaterialer endres som følge av interaksjon med SiO gass ved høye temperaturer. Dette har blitt gjort som et ledd i å øke forståelsen av hvordan ... -
Electrical Resistivity of Carbonaceous Bed Material at High Temperature
(Peer reviewed; Journal article, 2020)This study reports the effect of high-temperature treatment on the electrical properties of charcoal, coal, and coke. The electrical resistivity of industrial charcoal samples used as a reducing agent in electric arc ... -
Electrical Resistivity of Coke Beds
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:104, Doctoral thesis, 2008) -
Electrical Resistivity of Materials in the Silicon Furnace
(Doctoral thesis, 2023)Silicon is becoming an increasingly important part of the modern world through its applications in electronics, solar cells, and silicones, to name a few. Norway is a significant producer of silicon, competing with much ... -
Electrical Resistivity of Transformed Carbon Materials in the Silicon Furnace
(Chapter, 2022)Optimal current paths through the silicon furnace depend on the electrical properties of the charge materials. It is essential for good tapping conditions that sufficient current is supplied to the arc and lower part of ... -
Electrical Treeing and Partial Discharge Behaviour in Epoxy Nanocomposites with in situ Synthesized SiO2
(Peer reviewed; Journal article, 2023)The electrical treeing resistance of epoxy-SiO2 nanocomposites prepared by synthesizing functionalized SiO2 nanoparticles directly in epoxy was investigated and compared to pure epoxy (diglycidyl ether of bisphenol-A). ... -
Electro-oxidation of ethanol at Pt electrodes with the use of a Dynamic Electrochemical Impedance Spectroscopy (DEIS) technique
(Master thesis, 2012)Electro-oxidation of ethanol on smooth platinum surfaces was studied in thetemperature range 21C to 140C for 0.2 M ethanol in 0.5 M sulphuric acid.This was done by use of cyclic voltammetry and electrochemical impedances ... -
Electro-oxidation of small organic molecules
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:348, Doctoral thesis, 2012)An alternative to fossil fuels is to utilize biofuels like methanol and ethanol directly in fuel cells. One drawback of this system is the sluggish reaction kinetics in methanol and ethanol oxidation where strongly bound ... -
Electrocatalysis and Novel Functions of Nano-Structured IrO2-Ta2O5 /Ti Anodes
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:70, Doctoral thesis, 2013)In the present work, the main purpose was the development of the IrO2-Ta2O5/Ti anodes to suppress the unwanted side reactions in industrial electrolytic processes. The mixed effects of Ir mole ratio and thermal decomposition ... -
Electrocatalysis of the Oxygen Evolution Reaction: A Comparative Study of Anodically Formed and Nanostructured Iridium Oxides
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:26, Doctoral thesis, 2010)The thesis deals with electrocatalysts for the oxygen evolution reaction for proton-exchange membrane (PEM) water electrolysis. Water electrolysis is considered the only viable option for large-scale hydrogen production. ... -
Electrocatalysts for medium temperature PEM water electrolysis
(Doctoral Theses at NTNU, 1503-8181; 2013:190, Doctoral thesis, 2013)The main subject of this PhD thesis is the fabrication and investigation the electrochemical behavior of anode catalysts appropriate for medium- temperature proton exchange membrane (PEM) water electrolysis (WE) operating ... -
Electrochemical activation of a diatom-derived SiO<inf>2</inf>/C composite anode and its implementation in a lithium ion battery
(Peer reviewed; Journal article, 2021)Nano-architectured silica is extracted from algae harvested in the ocean. Its electrochemical properties are investigated as an anode material for lithium ion batteries. The beneficial effect of a carbon coating formed by ... -
Electrochemical analysis of aluminium alloy 5182 and 6016 with different surface treatments in 0.1 M NaCl electrolyte
(Master thesis, 2018)Replacing steel parts in cars with aluminium (Al) can reduce the weight by up to 50 % and contribute to decreased CO2 emissions. Aluminium is also easily and inexpensively recyclable. A lot of research is therefore conducted ... -
Electrochemical and photoelectrochemical characterization of porous semiconducting electrodes
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:262, Doctoral thesis, 2013)CaNb2O6 particles with crystallite sizes from 24 to 64 nm have been produced by solgel synthesis. The flatband potential was by impedance measurements determined to be around -0.4 V vs. NHE for a bulk sample, which is in ... -
Electrochemical Behavior of Tin in Molten LiCl-KCl at 450 ℃
(Journal article; Peer reviewed, 2019)The electrochemical behavior of tin was studied with cyclic voltammetry at glassy carbon electrodes in the fused LiCl-KCl at 450 ℃. Metallic tin deposition on the glassy carbon electrode occurs at a potential of around ... -
Electrochemical Behaviour of Carbon Anodes Produced with Different Mixing Temperatures and Baking Levels—A Laboratory Study
(Chapter, 2019)Anodes fabricated from a single source coke were used for investigations of effect of porosity and surface roughness on the electrochemical performance in laboratory scale cells. In order to fabricate anodes differing in ...