Materials Literature
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Two biogenetic guanidine carboxylates, i.e., creatinine acetate (CRA) and creatinine glycolate (CRG) based on creatinine (CR) were synthesized and structurally characterized by (1)H NMR, (13)C NMR and X-ray diffraction (XRD) analysis of the single crystals. The characterization demonstrated that CRA and CRG are CR-gua…
Nanoparticles of cerium-doped yttrium aluminum garnet (YAG:Ce 3+ ) phosphors were synthesized by a nonhydrolytic solvothermal method yielding particle sizes less than 10 nm. Oleic acid and oleylamine effectively capped the nanoparticles during the synthesis and allowed crystallization of garnet to take place at 300 °C…
We perform volumetric measurements of LiCl aqueous solution up to 1.00 GPa in the 100-170 K range, examine the pressure-induced vitrification and densification, and draw the pressure-temperature-volume surface. The pressure-induced vitrification of the solution corresponds to the cooling-induced vitrification of the l…
The magnetic properties together with the crystal and magnetic structures of the cobaltites La(1-x)Ba(x)CoO(3) (for x = 0.2 and 0.3) are determined by DC magnetization, AC magnetic susceptibility and neutron powder diffraction measurements over a broad spectrum of temperatures. For x = 0.3 a rhombohedral structure wit…
Highly crystalline CePO 4, CePO 4:Tb 3+, and CePO 4:Dy 3+ nanoleaves with monoclinic structure and dispersible in solvents such as water and methanol were prepared by a low temperature synthesis. Subsequently, these nanoleaves were incorporated into silica sols by the sol−gel method. Such nanoleaves incorporated into…
The electronic and magnetic properties of tetragonal double perovskite Sr(2)NiOsO(6) were studied by use of the density functional theory and including the spin-orbit coupling. Compensated half-metal is found if the spin-orbit coupling is not considered. Spin-orbit coupling induces orbital moments on both Ni and Os, m…
The low-energy spectrum of graphene nanoribbons with armchair edges (armchair nanoribbons) is described as the superposition of two nonequivalent Dirac points of graphene. In spite of the lack of well-separated two valley structures, the single-channel transport subjected to long-ranged impurities is nearly perfectly…
We report 139 La, 57 Fe and 75 As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on powders of the new LaO 1− x F x FeAs superconductor for x =0 and 0.1 at temperatures up to 480 K, and compare our measured NQR spectra with local density approximation (LDA) calculations. For all t…
The effects of Hf substitution and C content on the magnetic properties, phase evolution, and microstructure of melt spun ( Sm , Pr ) Co 7- x Hf x C y ( x = 0-0.5; y = 0-0.14) ribbons have been studied. A proper Hf substitution is helpful not only in stabilizing 1:7 phase but also in enhancing its magnetic anisotropy…
Equal channel angular pressing (ECAP) was performed on the extruded pure magnesium at 250°C for 4 passes. After ECAP processing, the grain size was significantly refined. And the damping capacity was increased at low strain amplitudes, but decreased at high strain amplitudes. Three peaks were observed during the measu…
The electroluminescent (EL) and photoluminescent (PL) characteristics in new blue emitting Bi-activated La2O3 oxide phosphor thin films prepared using a conventional or a combinatorial r.f. magnetron sputtering deposition method followed by postannealing are investigated. Intense blue PL emission was observed from the…
The effects of Y addition up to 5.13% (in weight) to Mg - Zn - Zr alloys on oxidation behaviors under atmospheric ambient conditions were investigated in this study. Samples were heated in the ambient atmosphere at 400°C, with samples cooled to room temperature for mass measurement after some period time of cumulative…
Ultrafine-grain size of ~1µm was achieved in an AZ31B Mg alloy wires with high strength prepared by cold drawing and subsequent annealing in the present study. Effects of cold-drawn area reduction (CAR) on strain hardening, recrystallized grain refinement and annealing temperature were investigated. The results showed…
This paper investigates the microstructure, martensitic transformation and shape memory effect of Co -16 Al alloy. The optical micrographs of Co -16 at .% Al alloy quenched from 1200°C show that the ε martensite occurs at room temperature, while some remaining γ phase can also be observed. This microstructure analysis…
We have synthesized the ternary organic/inorganic/polymeric terbium hybrid material (ACAC-Si)-Tb-PVP [ACAC = acetylacetone; PVP = poly(4-vinylpyridine)]. Firstly, the ACAC was modified through the hydrogen transfer addition reaction with a cross-linking reagent 3-(triethoxysilyl)-propyl isocyanate (TEPIC) to obtain a…
We report the discovery of a novel pathway for the transformation from highly oriented pyrolytic graphite foils into amorphous diamond platelets. This pathway consists of three stages of neutron irradiation, shock compression, and rapid quenching. We obtained transparent platelets which show photoluminescence but no d…
Li3InBr6-yXy (X=F, I) was synthesized and the substitution effect on ionic conductivity was investigated. Li3InBr6-yFy was single phase at y {less than or equal to} 3. The lattice constants were decreased with F content. The conductivity of Li3InBr6-yFy was decreased with y and electrochemical stability was improved b…
Low-temperature measurements of asymmetric carbon nanotube (CNT) quantum dots are reported. The CNTs are end-contacted with one ferromagnetic and one normal-metal electrode. The measurements show a spin-dependent rectification of the current caused by the asymmetry of the device. This rectification occurs for gate vol…
The reaction of the CN radical with O(2) was studied using infrared diode laser absorption spectroscopy. Detection of NO and secondary N(2)O products was used to directly measure the product branching ratio. After consideration of possible secondary chemistry and comparison to kinetic modeling simulations, the branchi…
A comprehensive study of the effect of covalent oxygen attachment on the transmission and conductance of armchair and metallic zigzag carbon nanotubes (CNTs) is presented. In both armchair and zigzag CNTs covalent oxygen attachment favors an ether-type bond in which the C-C bond breaks. Oxygen atoms attached on the CN…