Browsing Institutt for materialteknologi by Title
Now showing items 1636-1655 of 2573
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Observation of cation-specific critical behavior at the improper ferroelectric phase transition in Gd2(MoO4)3
(Journal article; Peer reviewed, 2022) -
Observation of Electric-Field-Induced Structural Dislocations in a Ferroelectric Oxide
(Peer reviewed; Journal article, 2021)Dislocations are 1D topological defects with emergent electronic properties. Their low dimensionality and unique properties make them excellent candidates for innovative device concepts, ranging from dislocation-based ... -
Observation of uncompensated bound charges at improper ferroelectric domain walls
(Journal article; Peer reviewed, 2019)Low-temperature electrostatic force microscopy (EFM) is used to probe unconventional domain walls in the improper ferroelectric semiconductor Er0.99Ca0.01MnO3 down to cryogenic temperatures. The low-temperature EFM maps ... -
Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate
(Peer reviewed; Journal article, 2020)Application of scanning probe microscopy techniques such as piezoresponse force microscopy (PFM) opens the possibility to re‐visit the ferroelectrics previously studied by the macroscopic electrical testing methods and ... -
Octahedral coupling in (111)- and (001)-oriented La0.7Sr0.3MnO3/SrTiO3 heterostructures
(Journal article; Peer reviewed, 2018)Rotations and distortions of oxygen octahedra in perovskites play a key role in determining their functional properties. Here, we investigate how octahedral rotations can couple from one material to another in La2/3Sr1/3 ... -
Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl4 with crown ether alkalide
(Journal article; Peer reviewed, 2014)Blue-green luminescent octoxy capped Si nanoparticles were synthesized via homogeneous reduction of SiCl4 with the crown ether alkalide K+(15-crown-5)2K− in tetrahydrofuran. The Si nanoparticles were characterized with ... -
On design, modelling, and analysis of a 10‐MW medium‐speed drivetrain for offshore wind turbines
(Peer reviewed; Journal article, 2020)Utformingen av et drivverk med middels hastighet for 10-MW referanse offshore vindturbin for Danmarks Tekniske Universitet (DTU). Det foreslås en fire-punkts drivlinjeoppsett som er utstyrt med en girkasse med to planetrinn ... -
On Gaseous Emissions During Alumina Feeding
(Peer reviewed; Journal article, 2021)Aluminium electrolysis involves feeding of alumina into a cryolite-based bath. Water originating from alumina as well as from air reacts with fluorides and results in HF evolution. Untreated HF gas is a significant ... -
On intermetallic phases formed during interdiffusion between aluminium alloys and stainless steel
(Peer reviewed; Journal article, 2022)One of the major challenges in welding of aluminium (Al) alloys and steels is the growth of brittle intermetallic phases, which depends on the thermomechanical processing history and the alloying elements. This work focuses ... -
On modelling electrochemical gas evolution using the volume of fluid method
(Chapter, 2020)In this work we describe the various building block relevant in simulating electrochemical gas evolution using Volume of Fluid (VOF) method. These building blocks are implemented in the VOF solver available in OpenFOAM® ... -
On sharp surface force model: effect of sharpening coefficient
(Journal article, 2020)Amongst the multitude of approaches available in literature to reduce spurious velocities in Volume of Fluid approach, the Sharp Surface Force (SSF) model is increasingly being used due to its relative ease to implement. ... -
On the ballistic perforation resistance of additive manufactured AlSi10Mg aluminium plates
(Journal article; Peer reviewed, 2019)Materials and structures made through additive manufacturing (AM) have received a lot of attention lately due to their flexibility and ability to customize structural components of complex geometry. One range of application ... -
On the chemical and electrochemical formation of aluminium carbide in aluminium electrolysis
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:287, Doctoral thesis, 2013)Cathode wear is considered as one of the key factors for limiting the lifetime of aluminium electrolysis cells. This phenomenon has become more important as aluminium smelters have steadily increased the amperage of the ... -
On the Cycling Performance and Stability of Silicon-Based Anodes in Lithium-Ion Batteries - Revealing Challenges and Failure Mechanisms Using Post Mortem Analyses
(Master thesis, 2017)Li-ion batteries with improved energy density can be obtained by increasing the Si content in the graphite electrode, or replace it entirely with a Si based electrode. This may have the additional benefit of improving ... -
On the Direct Reduction Phenomena of Bauxite Ore Using H2 Gas in a Fixed Bed Reactor
(Peer reviewed; Journal article, 2020)The Bayer Process is the dominant industrial method to produce alumina from bauxite ore. Due to the generation of large amounts of Bauxite Residue (red mud), an alternative method, called the Pedersen Process, is of our ... -
On the Durability of Protective Titania Coatings on High-Voltage Spinel Cathodes
(Peer reviewed; Journal article, 2022)TiO2-coating of LiNi0.5-xMn1.5+xO4 (LNMO) by atomic layer deposition (ALD) has been studied as a strategy to stabilize the cathode/electrolyte interface and mitigate transition metal (TM) ion dissolution. The TiO2 coatings ... -
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 ... -
On the Effect of Atoms in Solid Solution on Grain Growth Kinetics
(Journal article; Peer reviewed, 2014)The discrepancy between the classical grain growth law in high purity metals (grain size D∝t1/2D∝t1/2) and experimental measurements has long been a subject of debate. It is generally believed that a time growth exponent ... -
On the effect of calcium lignosulfonate on the rheology and setting time of cement paste
(Journal article; Peer reviewed, 2017)The effect of softwood calcium lignosulfonate, LSs, on the rheology and setting time of cement paste has been investigated. Two Portland cements with different surface area and C3A content were used. The lignosulfonate was ... -
On the electrocatalytic symbiotic synergism between Pt, Ni and Al in plasma vapour deposited Pt<inf>x</inf>Ni<inf>y</inf>Al<inf>z</inf> thin metal films for water electrolysis
(Journal article; Peer reviewed, 2021)This work highlights the fact that the activity of an already active metal/surface, i.e. Ni, can be increased even further by combining it with metals/surfaces that exhibit low activity, i.e. Pt and Al, when used on their ...