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Showing 1 to 14 of 14 for “"Hafnia"”.
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The high temperature structural evolution of hafnia
The transformations of HfO2 are often described as analogous with the transformations in ZrO2 because of the similar crystal structures; however the phase transformations in HfO2 occur at higher temperatures. Even though this phase transformation has been extensively studied in ZrO2 , the …
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The Effects of Titania on Selected Electrical and Mechanical Properties of Hafnia Rich Mixed Oxides in the System Hafnia Zirconia Titania
Embargo set by: Seth Robbins for item 71878 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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A Schottky-to-Ohmic Transition in Epitaxial Ferroelectric Hafnia Devices
… neuromorphic computing or sensing applications. Hafnia is a promising material to use in resistive memory systems due to its high industrial compatibility. Both the migration of oxygen ions and ferroelectricity are two mechanisms actively being explored to drive resistance change in hafnia based …
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IMPROVING THE HAFNIA-BASED RESISTIVE RANDOM-ACCESS MEMORY THROUGH MATERAL ENGINEERING
RESISTIVE RANDOM-ACCESS MEMORIES (RRAMS) ARE EXTENSIVELY INVESTIGATED AS A REPLACEMENT FOR FLASH MEMORIES DUE TO ITS SUPERIOR CHARACTERISTICS: HIGHER SPEED, BETTER ENDURANCE, MORE SCALABLE DESIGN AND SIMPLER FABRICATION PROCESSES. HOWEVER, DUE TO THE STOCHASTIC NATURE OF SUCH RESISTIVE SWITCHING, A …
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Quorum sensing in the genus Hafnia - in vitro and in silico investigations
… competitive advantage with a focus on the genus Hafnia within the order "Enterobacterales". A comprehensive review on bacterial quorum sensing (QS) and quorum sensing inhibition (QSI) mechanisms was undertaken in Chapter 1, with particular focus on microbiomes associated with foods and the human …
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Oxidation behavior of laser clad nickel-aluminum-chromium-hafnium alloys
… due to improved toughness in scales containing hafnia-rich polycrystallites possibly via microcracking initiated by anisotropic thermall contraction of the hafnia. Laser cladding provides a large concentration of $\approx$1$\mu$m Hf-rich particles that are precursors of the hafnia in the scale …
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Going Deeper into Laser Damage: Experiments and Methods for Characterizing Materials in High Power Laser Systems
… damage experiment was performed on 100 nm thick hafnia coatings deposited on fused silica. Uniformly grown films were compared to hafnia-alumina nanolaminates. While the nanolaminates are known to perform better for 1 ns pulses, we found they had worse laser damage performance in the CW regime. …
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Nonlinear Microscopy for Material Characterization
… 10 nm gold nanoparticles, nascent scandia and hafnia films, and laser induced material modification both above and below damage threshold conditions in hafnia thin-films. These results imply that TH imaging is potentially sensitive to laser-induced strain as well as to nanoscale defects or …
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In-situ plasmon-enhanced characterization of optically accessible ultra-thin film ferroelectric devices
… film (≤5 nm) ferroelectric devices. While Hafnia-based films have achieved ferroelectricity at single-digit nanometre thicknesses, they exhibit nonideal behaviours, specifically wake-up and fatigue effects. Using plasmon-enhanced spectroscopy, we provide the first real-time in-operando …
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Coating Thermal Noise in Gravitational-Wave Detectors
… Coating materials such as niobia-based oxides, hafnia-tantala mixtures, and substoichiometric silica, were explored employing strategies like compositional optimization, post-deposition annealing, and multimaterial designs with buried layers. Progress toward lower-noise coatings is demonstrated. …
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Molecular characterization of Flavobacterium spp. isolated from Rainbow trout (Oncorhynchus mykiss) farmed in Southern Africa and development of a PCR-based tool for differentiating between isolates
… were identified, which included, amongst others, Hafnia spp. and Aeromonas spp. Fifteen isolates were excluded from further analysis due to poor DNA sequence data, whilst four isolates showed high similarity to uncultured bacteria and they were also excluded from further analysis. Isolate OM-46 …
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Microstructures and oxidation properties in hafnium-tantalum-nitride ceramics
… The reaction of hafnium nitride conversion into hafnia was found to be affected by both boundary and diffusion mechanisms. The growth of an oxy-nitride intermediate layer was observed to coarsen and begin forming as low as 650^o C. Not only did the high density minimize boundary oxidation but the …
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Genome-guided bioprospecting for novel antibiotic lead compounds.
… Pseudomonas spp. and the other three isolates as Hafnia/Obesumbacterium spp. A database search showed that species belonging to these genera have genomes larger than the 3 Mb size above which an increasing proportion of a bacterial genome is dedicated to secondary metabolism. Given their …
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Phase equilibria, thermal expansion and symmetry relations within the HfO2-Ta2O5-TiO2-temperature system
Most material applications rely on a foundation of knowledge of phase equilibria. In this dissertation, a systematic approach to the rapid production of the high temperature HfO2-Ta2O5-TiO2 phase diagrams is presented that highlights the combined use of: (i) in-situ high temperature X-ray …