Materials Literature
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In a recent EPR study, Gross et al. (B. Gross, H. Dilger, R. Scheuermann, M. Päch and E. Roduner, J. Phys. Chem. A, 2001, 105, 10012) found that hydrogen atoms trapped in silasesquioxanes unexpectedly exhibit g-values significantly larger than the free-electron value, with an appreciable dependence on the external sub…
We have studied large supercells of PZT with different cation orderings and compositions using ab initio calculations. Despite the different macroscopic properties, we find similar structural motifs for all three phases. Our study shows that the polarization of PZT is mostly due to the displacement of the Pb cations,…
In order to study interface boundary structures, a three dimensional Near-Coincidence Site lattice (Near-CSL) model based on Bollmann’s O-lattice method has been proposed. Previous studies have shown that intragranular α-phase precipitates in a Ti–22V–4Al alloy have a morphology of lath-like, with two well defined fac…
INTRODUCTION: Recent discoveries of various forms of carbon nanostructures have stimulated research on their applications in diverse fields. They hold promise for applications in medicine, drug and gene delivery areas [1]. For instance, carbon nanotubes have the potential to carry drugs in the organism as they are hol…
Due to the evolution of cleanness of bearing steels, the failures observed in service conditions move from deep initiated spalling on non-metallic inclusions to surface damage due to machining marks, lack or contaminated lubrication (dents). To take into account, by the most economic way, these request for more demand…
Raman spectra in a ferroelectrics SrTiO 3 crystal in which 84% 16 O is replaced by the isotope 18 O were studied. Dielectric measurement shows that the sample undergoes a ferroelectric phase transition at 24K. Softening of a peak at 11cm m 1 was found on heating to the transition temperature T c . New peaks also appea…
The aim of this research is to investigate the effects of starch and compatibilizer contents on the thermal properties and moisture absorption of new polymeric-based biocomposite films from low-density polyethylene (LDPE) and banana starch. The compatibilizer used in this work was ethylene vinyl acetate copolymer (EVA…
Thermal shock fracture test using an infrared radiation heating (IRH) method was performed on alumina and two kinds of silicon nitride that have high and normal thermal conductivity. The thermal shock strength, R1c, and thermal shock fracture toughness, R2c, of these materials were estimated experimentally and theoret…
Alumina microspheres have been prepared by spray pyrolysis of Al(NO3)3 aqueous solutions by adjusting the flow rate of air as a carrier gas and the concentration of Al(NO3)3. A mixture of hollow α-Al2O3 microspheres in the range of 200-700 nm in diameter and solid microparticles of smaller size were prepared by pyroly…
Results from postirradiation examinations (PIE) of highly loaded U-Mo/Al dispersion fuel plates over the past several years have shown that the interaction between the metallic fuel particles and the matrix aluminum can be extensive, reducing the volume of the high-conductivity matrix phase and producing a significant…
The structural relaxation kinetics at the glass transition in tellurium oxide (TeO 2 )‐based glasses has been examined from viscosity and heat‐capacity measurements to clarify the features of the structural relaxation in fragile oxide glass‐forming liquids. A large decoupling between enthalpy relaxation and viscous fl…
Titanium alloys are favorable implant materials for medical applications, due to their desirable mechanical properties and biochemical compatibility. However, current bio-titanium alloys were formulated principally by trial and error, which by no means represents the optimum. Here a theoretical investigation of the in…
The motion of an edge dislocation is analyzed for temperatures ranging from 10 K to 200 K and for stresses up to 5 GPa. The dislocation velocity versus the applied shear stress curve can be divided into four regimes corresponding to successively higher shear stresses. In the first regime, the applied shear stress is b…
In the core of BWRs, the second-phase particles (SPP) of Zircaloy-2 and Zircaloy-4, the Zr(FeCr)2 and the Zr2(FeNi) phase, release Fe and dissolve. The degree of dissolution depends on initial size and fluence. These SPP, however, are important for the corrosion behavior of Zircaloy. Zircaloy shows an increase of corr…
This work develops a Monte Carlo (MC) simulation method for calculating the heat generation rate in electronic nanostructures. Electrons accelerated by the electric field scatter strongly with optical phonons, yet heat transport in silicon occurs via the faster acoustic modes. The MC method incorporates the appropriat…
Liquid nanodroplets within a size range of 50 to 500 nm can easily be prepared by shearing a system containing oil, water and a surfactant. The growth of the nanodroplets can effectively be suppressed by using a strong hydrophobe as an additivie to the oil and an effective surfactant. The hydrophobe acts as an osmotic…
In a laboratory experiment, four concentrations of two natural bentonite clay deposits (commercial Bentonite and Aquagel) were applied to study their impact on water movement in a sandy calcareous soil. Cumulative infiltration ( D ), advance of wetting front ( Z ), and available water content (AWC) were measured for u…
Xenotime‐type GdPO 4 (tetragonal, I 4 1 / amd ) has been synthesized hydrothermally at 400°C. X‐ray powder data have been presented, and the lattice parameters have been calculated as a = 0.6969(2) nm and c = 0.6095(3) nm.
Due to their periodic helical structure, cholesteric liquid crystals (CLC) have a unique ability to selectively reflect visible light. CLC films reflecting a broad wavelength band were made by inducing a pitch gradient in CLC through a diffusion of small molecules and through a thermal diffusion between two CLC oligom…
Vacuum refining experiments of indium and gallium metals have been performed. When indium metal of 99.97% purity was refined at 1273 K and 1.3×10−3 Pa for one hour, Pb and Bi were effectively removed from indium metal. After refining 99.9% Ga at 1373 K and 1.3×10−3 Pa for six hours, removal of Bi, Pb, Zn, Mg, Ca and F…