Materials Literature
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Abstract Four related quaternary compounds containing rare‐earth metals have been synthesized employing the molten flux method and metathesis. The reactions of Eu and Rb 2 S 5 with Si and Ge in evacuated fused silica ampoules at 725 °C for 150 h yielded RbEuSiS 4 ( I ) and RbEuGeS 4 ( II ), respectively. On the other…
In this paper ab initio quantum mechanical calculations of the 14 N-nuclear quadrupole resonance (NQR) parameters of alanine, glycine, valine, and serine obtained from an electric field gradient (EFG) tensor, such as quadrupole frequencies and asymmetry parameters in gas phase and different solvents, have been carried…
The coercivity of sintered magnets like barium ferrite (BaFe12O19), samarium-cobalt (SmCo5) or neodymium-iron-boron (Nd2Fe14B) is largely affected by the grain size. A method to evaluate coercivity behavior as function of the crystalline orientation, including also the effects of grain size and lattice defects, is pre…
A change in the surface structure of low-density polyethylene films upon chemical modification by gaseous fluorine has been studied by scanning electron microcopy and X-ray spectral analysis. It has been demonstrated that this treatment leads to formation of the wavy surface; its characteristics depend on the method o…
Bond critical point, local kinetic energy density, G(rc), and local potential energy density, V(rc), properties of the electron density distributions, rho(r), calculated for silicates such as quartz and gas-phase molecules such as disiloxane are similar, indicating that the forces that govern the Si-O bonded interacti…
Experimental study using the transpiration method investigates equilibrium evaporation behavior of radionuclide polonium (210Po) generated and accumulated in liquid lead-bismuth eutectic (LBE) cooled nuclear systems. The experiment consists of two series of tests: preliminary evaporation tests for homologue element te…
A new combinatorial initiated (i)CVD system is fabricated and used to efficiently determine the deposition kinetics for two new polymeric thin films, poly(diethylaminoethylacrylate) (PDEAEA) and poly(dimethylaminomethylstyrene) (PDMAMS). The results of combinatorial depositions are compared to blanket iCVD under ident…
A floating catalyst chemical vapor deposition (FC-CVD) method was designed and fabricated to produce high quality and quantity carbon nanotubes. The reaction temperature was optimized to produce high yield and purity of the carbon nanotubes. The reaction temperatures were varied from 500–850°C. The result shows that c…
In spent nuclear fuel (SNF), the micrometer- to nanometer-sized epsilon phase (Mo-Ru-Pd-Tc-Rh) is an important host of 99 Tc which has a long half life (2.13×10 5 years) and can be an important contributor to dose in safety assessments of nuclear waste repositories. In order to examine the occurrence and the fate of t…
Determining transmission electron microscope specimen thickness is an essential prerequisite for carrying out quantitative microscopy. The convergent beam electron diffraction method is highly accurate but provides information only on the small region being probed and is only applicable to crystalline phases. Thicknes…
The temperature dependence of the Hall mobility µ H has been measured from 140 to 870 K for nine boron-doped homoepitaxial chemical vapor deposition (CVD) diamond thin films. The experimental µ H data are compared with their theoretical µ H values that are calculated by an iterative technique, assuming scattering by i…
The origin of the linear relationship between the reaction energy of the CH2/NH/O exo and endo additions to armchair (n, n) single-walled carbon nanotubes (SWNTs) and the inverse tube diameter (1/d) measuring sidewall curvature was elucidated using density functional theory and density functional tight binding methods…
In this paper a physical basis for the variation in loss coefficients is developed. The standard three-term core loss separation model is assumed under sinusoidal (alternating) excitation. Some important material and operational properties that are often neglected in the literature when developing core loss models are…
In this paper, we review our main results on the optical and electrical properties of light-emitting silicon nanocrystals (Si-ncs) obtained from the thermally induced nucleation in amorphous silicon-rich nitride (SRN) films deposited either by plasma-enhanced chemical vapor deposition (PE-CVD) or magnetron sputtering.…
The electron spin resonance (ESR) technique was employed to investigate the point defects and evidence of Eu 2+ in Eu-doped barium titanate (EBT) ceramics sintered in air according to the formula (Ba 1- x Eu x )Ti 1- x /8 O 3 . The charge equilibrium compensation mechanism was discussed on the basis of ESR with the ai…
Localization in a quasibrittle material is studied using a local second-gradient model. Since localization takes place in a medium assumed to be initially homogeneous, nonuniqueness of the solutions of an initial boundary value problem is then also studied. Using enhanced models generalizes the classical localization…
Generally, it has been assumed that signal intensity variations in back-scattered electron (BSE) images of minerals are mainly controlled by chemical heterogeneity. This is especially true for images of single crystals, where effects of different crystal orientations with respect to the incident beam on the observed B…
Various families of soft ferrites (Ni–Cu–Zn; Mg–Cu–Zn; Co 2 –Z; Mn–Zn) with a sintering temperature of T ≤950°C are used for multilayer inductors. It is shown for Ni–Cu–Zn and Mg–Cu–Zn ferrites that composition, powder particle size, and sintering additive concentration strongly affect the shrinkage, sintering behavio…
Abstract Poly(vinyl pyrrolidone) was grafted onto crosslinked polystyrene beads through the 2‐chloroethyl sulfonamide (CSA) groups present in the resin using the atom transfer radical polymerization (ATRP) method. A beaded polymer with a poly(vinyl pyrrolidone) surface shell was prepared in three steps, starting from…
In this paper, we report correlations between processing, microstructure, and electrical properties of Ga doped ZnO films. Films with different grain sizes were grown on amorphous glass substrate by changing the substrate and pulsed laser deposition variables. The results corresponding to these films were compared wit…