Materials Literature
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The shock response of a silicon carbide has been investigated using the methods of plate impact, and monitored using manganin stress gauges mounted so as to be responsive to lateral stress. Close to the impact face, a two-step stress response is observed, indicating the presence of delayed failure at the impact face.…
The nature and thermal evolution of nanoconfigurations around cations in a sol-gel derived solid solution of a ZrO 2 15 mol % Fe 2 O 3 nominal concentration have been investigated by means of the hyperfine techniques of the Mössbauer effect at the Fe sites and perturbed angular correlation spectroscopy (PAC) at the Zr…
Solid‐state compatibility and melting relations of MgAl 2 O 4 in the quaternary system Al 2 O 3 –CaO–MgO–SiO 2 were studied by firing and quenching selected samples located in the 65 wt% MgAl 2 O 4 , plane followed by microstructural and energy dispersive X‐ray analysis. A projection of the liquidus surface of the pri…
The phase and microstructure relationship of 12 mol% CeO 2 ‐stabilized ZrO 2 ceramics prepared from coated powder was investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy‐dispersed X‐ray spectroscopy (EDS). As compared with the sample prepared with co‐precipitated m…
Abstract The thermomechanical modification of hydrogenated nitrile butadiene rubbers (HNBR) of different molecular parameters was investigated by rheological and light scattering techniques. The influences of acrylonitrile content, degrees of hydrogenation, and Mooney viscosity were examined. A melt blender with Banbu…
A new simplified route to prepare nanocrystalline alumina powders is proposed. The method involved the use of freshly extracted egg white (ovalbumin) and aluminum nitrate in an aqueous medium. Changes in ionic strength upon addition of aluminum nitrate resulted in gelation of ovalbumin. The added metal ions were dispe…
In this work, a theoretical study on the growth of macropores fabricated from n-type silicon by photoelectrochemical etching in HF-based electrolytes is reported. By solving the diffusion equation into the pores, we deduce a self-consistent model which can be used for quantitative prediction of the growth speed and po…
The microstructure evolution and densification of alumina containing 10 vol% calcium aluminosilicate glass and 0.5 wt% magnesium oxide sintered at 1600°C were quantified by measuring the evolution of pore‐size distribution, the redistribution of liquid phase, and the fraction of closed and open pores. The densificatio…
Polarization and dielectric behavior of Li and Ti co‐doped NiO (LTNO) ceramics was investigated. Analysis of the ceramic microstructure and composition indicate that an obvious grain boundary was formed and surrounded the grains, and Ti ions distributed in grains and grain boundaries. The concentration of Ti had a rem…
Abstract Three heteroleptic tris(phthalocyaninato) rare‐earth triple‐decker complexes [(Pc)M(Pc)M{Pc(α‐OC 5 H 11 ) 4 }] [M = Sm, Gd, Lu; Pc = phthalocyaninate; Pc(α‐OC 5 H 11 ) 4 = 1,8,15,22‐tetrakis(3‐pentyloxy)phthalocyaninate] have been prepared as racemic mixtures by treating [M{Pc(α‐OC 5 H 11 ) 4 }(acac)], genera…
Twinning, i.e., the formation of structural domains, in La1−xSrxMnO3 thin films, which grow coherently on (001)-oriented cubic substrates, is explained as a result of shear strain relaxation within the distorted rhombohedral La1−xSrxMnO3 crystal lattice. A one-dimensional periodic model structure of twins is proposed…
Preliminary studies have been conducted into the occupational radiation exposure to NORMS from surface and underground mining operations in a gold mine in the Ashanti Region of Ghana. A brief description of the methods and instrumentation is presented. The annual effective dose has been estimated to be 0.26 +/- 0.11 m…
The stability of an yttria‐stabilized zirconia and samaria‐doped ceria (YSZ–SDC) nanocrystalline heterophase system was studied with in situ high‐temperature X‐ray diffraction during a simulated sintering program. Formation of YSZ–SDC solid solution in the nanocrystalline system was found to start at a low temperature…
Technologies for ITER divertor vertical target plasma facing components, Schlosser, J., Escourbiac, F., Merola, M., Fouquet, S., Bayetti, P., Cordier, J.J., Grosman, A., Missirlian, M., Tivey, R., Rödig, M.
Well-aligned ZnSe nanowires and nanorods can be grown on ZnSe epilayers on different GaAs substrates, with and without catalyst, by metal-organic chemical vapor deposition. Gold particles affect the number density, growth direction, and the morphology of the resulting nanostructures. In the absence of the gold catalys…
The sintering kinetics of the porous ceramics from natural diatomite is investigated by means of stepwise isothermal dilatometry (SID) accompanied with XRD, scanning electron microscope (SEM), and porosity measurement. We find that the isothermal shrinkage data from SID could be well analyzed to get kinetic parameters…
This work proposes a methodology to estimate core losses under pulsewidth modulation (PWM) or dc bias ripple voltage excitations. A special hysteresisgraph was built to measure toroidal samples under pulsed voltages. An experimental methodology, based on the principles of ferromagnetism, was implemented to investigate…
Polycarbosilane (PCS) was used as a precursor to prepare porous silicon carbide (SiC) ceramics with in situ growth of β‐SiC nanowires. The pore size of the as‐prepared porous ceramics was 1.37 μm in average, and had a narrow distribution. The nanowires with diameters ranging from ∼10 to 50 nm existed in the channels o…
Polypyrrole-poly(N-vinylcarbazole) (PPy-PVK) core-shell nanoparticles have been fabricated by nanoparticle-seeded dispersion polymerization. The monodisperse PPy nanoseeds are fabricated by micelle templating, and the PVK shell thickness is easily tuned by varying the amount of N-vinylcarbazole monomer. The PPy core a…
Well-aligned ZnO nanorod arrays were synthesized by thermal evaporation of ZnO powder on ZnO thin films. The nanorods are almost the same length of 5.5μm and well-oriented perpendicular to the substrates. The time-integrated and time-resolved photoluminescence spectra of the nanorod arrays revealed the existence of la…