Materials Literature
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A novel approach to the fabrication of GaNxAs1-x quantum dots and wires via ion beam patterning is presented. Photomodulated reflectance spectra confirm that N can be released from the As sublattice of an MBE-grown GaNxAs1-x film by amorphization through ion implantation followed by regrowth upon rapid thermal anneali…
The hysteresis of the Ising model in a spatially homogeneous AC field is studied using both mean-field calculations and two-dimensional Monte Carlo simulations. The frequency dispersion and the temperature dependence of the hysteresis loop area are studied in relation to the dynamic symmetry loss. The dynamic mechanis…
We explore manifestations of electron-phonon coupling on the electron spectral function for two phonon modes in the cuprates exhibiting strong renormalizations with temperature and doping. Applying simple symmetry considerations and kinematic constraints, we find that the out-of-plane, out-of-phase O buckling mode (B_…
Time-resolved transmittance measurements performed on Ga$_{0.94}$Mn$_{0.06}$As in the vicinity of the Mn-induced mid-infrared absorption band are presented. Upon photo-excitation, a slow increase (hundreds of ps timescale) of the differential transmittance is observed and found to be directly related to demagnetizatio…
Single molecule Raman spectroscopy provides information on individual molecules with vibrational-level resolution. The unique mechanisms leading to the huge Raman cross-section enhancement necessary for single molecule sensitivity are under intense investigation in several laboratories. We recently analyzed large spec…
Ultrananocrystalline diamond (UNCD) films were prepared by microwave plasma chemical vapor deposition using argon-rich Ar∕CH4 plasmas at substrate temperatures from ∼400 to 800°C. Different seeding processes were employed to enhance the initial nucleation density for UNCD growth to about 1011sites∕cm2. High-resolution…
Silicon carbide ceramics were prepared with SiC powder treated by the fluidized bed opposed jet mill as raw materials, and the effects of the ultra-fine treatment mechanism on the compaction and sintering behavior of SiC ceramics were investigated. The results showed that the compacts had higher density and microstruc…
The single crystal X-ray structure of [ Co ( TPP )( BzNH 2 ) 2 ]( SCN ), compound 2, where TPP = 5,10,15,20-tetraphenylporphyrin dianion and BzNH 2 = benzylamine, reveals that the SCN - ion is hydrogen-bonded to one of the coordinated amino group hydrogen atoms via its sulfur atom. Furthermore, the N – H ⋯ SCN interac…
In this paper, we present a process for growing a Cu seed layer on a Ta/SiO 2 /Si substrate using an electroless plating (ELP) process at an extremely low temperature (∼30°C). In this process, the activation treatment of the Ta/SiO 2 /Si substrate was carried out by immersion in a PdCl 2 /HCl solution prior to electro…
Flexoelectric instability was observed in a hybrid aligned nematic liquid crystal layer with the director having planar orientation at one substrate and homeotropic at the other substrate. The threshold and contrast characteristics of the electrooptical cell and the differential flexoelectric coefficient e = e 11 – e…
As the 2010 phaseout date for chlorofluorocarbons draws nearer, materials engineers are working to find replacements for these ozone-depleting chemicals in the production of plastics and other products. One team of engineers is focusing on a combination of two low-cost and environmentally benign substances--supercriti…
In this paper we demonstrate for the first time that pre-vulcanized NR latex can be doped by iodine to become electrically conducting. The study reveals that pre-vulcanisation will not hinder the formation of conjugated sequences, which is widely accepted as a prerequisite for developing intrinsic electrical conductiv…
Extended abstract of a paper presented at the Pre-Meeting Congress: Materials Research in an Aberration-Free Environment, at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, July 31 and August 1, 2004.
O presente trabalho foi desenvolvido com o objetivo de avaliar o efeito da adição de CO2 sobre a qualidade do macarrão tipo massa fresca. Esse produto, por apresentar características desejadas pelo consumidor, como preparo rápido e sabor agradável, vem proporcionando uma aceitação cada vez maior. Além disso, o consumi…
Void swelling of PWR austenitic internals has recently been identified as a materials issue that might impact license extension. Earlier published studies have shown that the atomic displacement rate is unexpectedly one of the most important variables that determine the magnitude of swelling. In addition to difference…
Nuclear waste management has led to recycling PuO/sub 2/ into mixed oxide fuel nuclear fuel (MOX). Its manufacturing route involves a sintering process. A multiscale model is under construction in order to predict the evolution of the sample characteristics during sintering and to improve sintering conditions. The pur…
La 1− x Li x FeO 3 solid solution prepared by solid-phase synthesis in an air environment at atmospheric pressure is found to exist only for x ≲0.1. All single-phase samples are p -type semiconductors. An increase in lithium concentration brings about a decrease in their electrical resistivity and thermopower. The res…
The physical properties of six ICCS fibers—B—26, C-36, D-5, E-4, G-17, and I-26-their percent crystallinity, and the amount of absorbed water are measured in order to establish relationships with specific surface areas measured by the absorption of methy lene blue in a liquid phase. The results show the relationships…
Polarization hysteresis loop of CaBi4Ti4O14 thin film has been studied in the frequency range from 200 Hz to 600 KHz for different applied voltages. It shows that the hysteresis loop is frequency- and voltage-dependent. The maximum polarization decreases logarithmically with the increase of frequency. In contrast, the…
Two kinds of glass/ceramic composites were prepared. The first contained borosilicate glass with SiC ceramic: batches designated SG10, SG20, SG30 and SG40 consisted of 10 : 90, 20 : 80, 30 : 70 and 40 : 60 SiC/glass (wt-%) respectively. The second contained borosilicate glass with ZrO2: batches designated ZG5, ZG10, Z…