Materials Literature
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Efficient phosphor performance, meaning a high photoluminescence quantum yield (Φ), requires the Ce 3+ ion to be hosted in a rigid crystal structure. This is particularly important when the phosphor is operated at slightly elevated temperatures, as is becoming conventional in high brightness, phosphor-converted white…
A critical challenge in realizing magnetoelectrics based on reconfigurable microwave devices, which is the ability to switch between distinct ferromagnetic resonances (FMR) in a stable, reversible and energy efficient manner, has been addressed. In particular, a voltage-impulse-induced two-step ferroelastic switching…
For colloidal quantum dot light-emitting diodes (QD-LEDs), blue emissive device has always been inferior to green and red counterparts with respect to device efficiency, primarily because blue QDs possess inherently unfavorable energy levels relative to green and red ones, rendering hole injection to blue QDs from nei…
Flexible, electrically conducting, high temperature stable ceramics with very high porosities are fabricated from interpenetrated metal oxide nano-microstructures in a versatile manner in a novel flame transport synthesis approach. The Young's modulus of these networks can be tuned from wool type to rubber like based…
We present a detailed Raman study of defective graphene samples containing specific types of defects. In particular, we compared ${\mathit{sp}}^{3}$ sites, vacancies, and substitutional Boron atoms. We find that the ratio between the $D$ and $G$ peak intensities, $I$($D$)/$I$($G$), does not depend on the geometry of t…
Significant industry developments over the past decade have placed concrete ageing at the forefront of life extension decisions related to nuclear power plants. Recent issues encountered include alkali–silica reactivity in concrete, delamination events, larger than anticipated loss of pre-stressing force, spent fuel p…
The susceptibility to hydrogen embrittlement and the fatigue properties of several high nitrogen stainless steels were evaluated by SSRT (Slow Strain Rate Test) and external fatigue test. The tensile properties were evaluated by SSRT in gaseous hydrogen pressurized up to 90MPa in the temperature range from −40 degree…
The Disk Pressure Test is used to select metallic materials for hydrogen storage and transportation and consists of a thin metallic disk bulged out until fracture by applying a gas pressure on its lower face. The ratio of the fracture pressures obtained with a neutral gas and with hydrogen gas defines a phenomenologic…
A novel series of multi-walled carbon nanotube (MWCNT) reinforced siloxane dianhydride based polyimide (PI) nanocomposites were designed and developed using in situ polymerization approach via thermal imidization. The polyamic acid obtained from the reaction of siloxane dianhydride and pyridine diamine/ p-phenylenedia…
In the past decades, heat transport in thin film structures has been extensively studied due to its importance in performance optimization of micro/nano-scale devices. A large amount of heat is generated during the operation of electronic devices and must be dissipated efficiently via dielectric electrical insulating…
Long lived: Carbonyloxyl radicals (RCO2.) are reactive intermediates that play key roles in initiating polymerization reactions. This reactivity also makes their direct observation difficult. For the first time a persistent organic RCO2. radical is detected in the gas phase, its extraordinary longevity is attributed t…
Neutron irradiation embrittlement of reactor pressure vessel (RPV) steels is one of the key aging phenomena that need to be properly managed and considered in the plant operations. The current embrittlement correlation method in Japan, JEAC 4201-2007, was developed in 2007 using the surveillance database as of the end…
The electrocaloric effect (ECE) is a phenomenon in which reversible temperature and entropy changes of a material due to polarization appear under the application and removal of an electric field. Materials with a giant ECE have recently been reported, suggesting practical application in cooling devices. In this paper…
Low friction silicon carbide (SiC) ceramic seals were prepared by liquid phase sintering in the presence of graphite fluoride. The addition of graphite fluoride as a lubricating additive restricted the sintering of SiC ceramics and worsened the mechanical properties to some extent, but obviously reduced the friction c…
Austenitic stainless steels such as type 304 and 316 are susceptible to stress corrosion cracking in high temperature water environments typical of boiling water reactors (BWR) and pressurized water reactors (PWR). The accumulation over time of irradiation dose on the austenitic materials increases further their susce…
Two novel phosphrous–nitrogen-containing flame retardants (3) and (4) were successfully synthesized from two steps: condensation reaction between 4-aminopenol and 1,4-phthaladehyde (or 4,4′-biphenyldicarboxaldehyde) and addition reaction between the above condensation compounds and 9,10-dihydro-9-oxa-10-phosphaphenant…
Effect of Zn content on the dielectric and transport properties of CoZnxFe2-xO4 (x = 0.0, 0.1, 0.2, 0.3 and 0.4), prepared by standard double sintering ceramic technique, sintered at 1000°C for 4 hours were investigated. The X-ray diffraction (XRD) pattern of the prepared samples showed single phase inverse-spinel str…
Der Au84+-Kern von [Au20(SR)16] besteht aus zwei nichtkonjugierten Au4-Tetraedern, die als 4-Zentren-2-Elektronen (4c-2e)-Überatome betrachtet werden können. Die vier Valenzelektronen sind in den Au4-Einheiten jeweils über 4c-2e-σ-Bindungen delokalisiert. Eine chemische Bindungsanalyse bestätigt das Vorliegen vernetzt…
The corrosion of X70 steel and iron in supercritical CO2/SO2/O2/H2O environment were investigated after a 454 h exposure. Optical microscopy was applied to observe the morphology of etch pits and synthesise the three-dimensional morphology. X-ray diffraction and X-ray photoelectron spectroscopy were employed to detect…
Scanning tunneling microscopy (STM), atomic force microscopy (AFM) and magnetic force microscopy (MFM) are used to characterize the morphology and strain-induced α′ martensite distribution on the twin fracture surfaces of hydrogen-precharged type 304 austenitic stainless steel tensile tested at 200–218 K. The STM imag…