Materials Literature
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In situ synthesis of bulk Al 3 BC 3 was achieved via a reactive hot‐pressing method using Al, B 4 C, and graphite powders at 1800°C for 2 h. The reaction path for synthesizing Al 3 BC 3 was investigated. It was found that Al 3 BC 3 formed via the reaction of C, B 4 C, and Al 4 C 3 above 1180°C. Dense Al 3 BC 3 was pre…
For various polyethylenes at ambient and elevated temperatures, tensile deformation was characterized by measurements of true stress-true strain curves at constant strain rates, the determination of the elastic and plastic part of strains, and registrations of the stress relaxation at fixed strains. Some peculiar feat…
Lake St. Lucia, South Africa's largest estuarine system, was isolated from the sea by a beach berm throughout a severe drought from 2002 to 2007, with the lake water level being extremely low over much of its total area. A reverse salinity gradient resulted, with the lowest salinity in the south near the sea and the h…
Jahnsite-(NaFeMg), NaFe 3+ Mg 2 Fe 2 3+ (PO 4 ) 4 (OH) 2 ·8H 2 O, space group P2/a, a = 15.0811(16), b = 7.1403(8), c = 9.8299(11) Å, β = 110.445(1)°, V = 991.8(2) Å 3 , and Z = 2, is a new mineral from the Tip Top mine, Custer County, South Dakota. It occurs as the dominant chemical zone in transparent pseudo-orthorh…
This paper outlines the research carried out on the sonochemical degradation of 2-chlorophenol in the presence and absence of chlorinated compounds. The degree of enhancement varied according to the characteristics of chlorinated compounds. The higher oxidation states of carbon in chlorinated compounds increase the de…
Partial oxidation of an aqueous solution of CoIICl(2).6H2O with (NH4)6[Mo7VIO24].4H2O in the presence of (NH4)2SO3.H2O and LiCl, at pH approximately 5.3, leads to isolation of the octanuclear cluster (NH4)11(Li subset[Co4IICo4III(SO3)16(NH3)8].10H2O), 1. The structure of the anion of 1 consists of a central [Co4II], a…
The present understanding of magnetic properties of quasicrystals (QCs) is reviewed. In AlMn and AlPdMn QCs, only a few Mn atoms, with concentrations from a few per cent down to 10−4 carry a localized magnetic moment. These moments are coupled via RKKY interactions, leading to a canonical spin-glass ordering at low te…
Effect of Mn-Doping on the Piezoelectric Properties of (K0.5Na0.5)(Nb0.67Ta0.33)O3 Lead-Free Ceramics, Watanabe, Yoshiki, Sumida, Kenichi, Yamada, Seiji, Sago, Sumihito, Hirano, Shin-ichi, Kikuta, Koichi
Self- assembly of biological molecules forms the basic principle in the formation of complex biological structures. Numerous proteins and peptides have been emerging as nanobiomaterials due to their ability to self-assemble into nanoscale structures like nanotubes, nanovesicles, helical ribbons and three dimensional f…
This work reports the effect of hydrogen concentration on the amino group introduction by the plasma treatment of the polyethylene surface. The amino group selectivity on the polyethylene sheet treated by the surface-wave plasma in various N2/H2 gas mixtures was examined by chemical derivatization combined with x-ray…
We present a model for describing electrical properties of an electrochemically controlled heterojunction between a conducting polymer (polyaniline) and a solid electrolyte (lithium salt doped polyethylene oxide). In particular, the difference in the kinetics of the conductivity variation for different polarities of t…
A phase change memory device, consisting of Ge 2 Sb 2 Te 5 chalcogenide, a Mo electrode and a SiO 2 dielectric layer, was fabricated in order to investigate the failure mechanism. During the pulsed mode switching of the device with a reset pulse (5.0 V, 90 ns) and a set pulse (1.5 V, 30 µs), some devices failed to res…
Titanium oxide films were prepared by RF magnetron sputtering onto glass substrates. The effects of RF power and deposition temperature on crystalline structure, morphology and energy gap were investigated, which were analyzed by X-ray diffraction, SEM and UV-Vis spectrometer, respectively. Results show that rutile ph…
The Mn doping effects on the electric and dielectric properties of ZnO epitaxial films were studied. To optimize the stoichiometry of undoped ZnO film prepared by pulsed laser deposition, we evaluated the intensity ratio of the optical emission from excited oxygen atoms (O*) and excited zinc atoms (Zn*) generated by a…
Nondoped potassium niobate (KNbO 3 ) ceramics were synthesized with fine powders obtained by a hydrothermal method. The hydrothermal method employs a chemical reaction in a solution. Low reaction temperature and self-assembly growth resulted in high-quality KNbO 3 powders. In this study, various temperature conditions…
The development of a head-end processing step for spent oxide fuel that applies to both aqueous and pyrometallurgical technologies is being performed by the Idaho National Laboratory, the Oak Ridge National Laboratory, and the Korean Atomic Energy Research Institute through a joint International Nuclear Energy Researc…
Near-infrared luminescence is observed from bismuth-doped GeS 2 —Ga 2 S 3 chalcogenide glasses excited by an 808 nm laser diode. The emission peak with a maximum at about 1260 nm is observed in 80GeS 2 -20Ga 2 S 3 :0.5Bi glass and it shifts toward the long wavelength with the addition of Bi gradually. The full width o…
N-ZnO/p-Si heterojunctions are prepared by sputtering deposition of intrinsic ZnO films on p-Si substrates. Thicknesses of ZnO films are altered by varying the deposition time from 1 h to 3 h. The electrical properties of these structures are analysed from capacitance-voltage (C-V) and current-voltage (I-V) characteri…
A novel method is described for the preparation of nearly monodispersed and highly magnetic responsive microspheres with magnetite nanocrystals formed in a polymeric matrix by hydrothermal reduction. The method is based on the formation of iron hydroxide/polymer composite microspheres by acid-catalyzed condensation po…
A series of novel symmetrical and unsymmetrical triphenylene‐based discotic liquid crystalline materials with one or six branched peripheral alkoxy chains have been prepared. These materials have been compared with analogous known symmetrical and unsymmetrical compounds to reveal a balance between steric and space‐fil…