Materials Literature
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Metastable scheelite EuVO 4 was stabilized by a high temperature and pressure method, which was transformed into a stable zircon phase by annealing treatment in air. Scheelite EuVO 4 gave strong emissions with a dominant peak at 617 nm associated with the 5 D 0 7 F 2 transition of Eu 3 + . 151 Eu Mössbauer spectra i…
4.1 Introduction
Luminescent properties of polycrystals in the visible and infrared spectral ranges were investigated. The presence of two different point symmetries for centers is well established by selective and polarized photoexcitation. The Ca thiogallate compound can be considered as a promising material for optical communicatio…
Lattice constants, bulk modulus and heat of solution of a Mg7Li1 alloy are calculated by using an ab initio pseudopotential method based on the density function theory and the supercell approach. Lattice constants and bulk modulus at zero pressure are obtained by using the stress calculation and generalized Hooke’s la…
Control of noise and vibration remains to be solved for the lowering of environmental load in all the industrial fields. It is necessary to take account of the noise and vibration problem when designing machines or structures. Therefore the development of damping materials suitable for structural parts that are easy t…
High-surface-area alumina with aligned macro- and microscopic pores was synthesized by a single-step processing using freeze-drying. A water-based slurry of Al2O3 and Al(OH)3 mixture was frozen while controlling the freezing direction. The frozen slurry was dried under reduced pressure and columnar pores were generate…
In reaction-sintered silicon carbides, usually 10-40vol% of the residual silicon phase remains after the reaction-sintered process. For this reason, the bending strength of reaction-sintered silicon carbides decreases to or below 300MPa. The raw material composition (C/SiC) and the starting particle size were optimize…
RESUMO: Para a determinação das substâncias ativas presentes nas partes aéreas da Calotropis procera, realizou-se estudo fitoquÃmico, detectando-se nas folhas glicosÃdeos flavônicos, glicosÃdeos cardiotônicos, triterpenos, esteróides e polifenóis. Objetivando-se estudar a toxicidade das folhas de Calotropis…
The objective of this research was to reinforce natural rubber with silica prepared from rice husk. Rice husk was cleaned with tap water, then treated with 0.4M hydrochloric acid at 105oC for 3 hours. The treated rice husk was burnt at 600oC for 6 hours. The resulting white ash contained as high as 99.6 % silica. The…
Ag(I)-promoted oxidation of (5,15-diaryl-10-phenylethynyl-porphyrinato)zinc(II) complexes in CHCl3 gave directly linked 12,13-dehydropurpurin-porphyrin dyads, the structures of which were revealed by X-ray analysis.
The errors involved in precision lattice parameter determination fall into three broad groups: errors that can be corrected by applying a multiplication factor to the determined parameter(s), errors arising from a constant shift in peak position, and errors arising from a Bragg angle dependent shift in peak position.…
The design of a new instrument is described along with results demonstrating the capabilities of in situ preparation and analysis. The purpose of the ARTOSS experiment is the preparation and analysis of multi-component surface layers on materials – in particular those which are well-suited for the first wall of presen…
Plasticizer migration studies dealing with poly(vinyl chloride) (PVC) sheets and liquid surrounding media revealed two parallel phenomena, migration of plasticizer and liquid penetration, that take place simultaneously. The present work was focused on correlating the structural differences of the PVC material with the…
This paper is aimed at investigating the possibility of detecting and estimating hydrogen absorption on standard cylindrical electrodes in single-compartment electrochemical cells, to avoid classical measurements with membrane-shaped samples in double-compartment cells that cannot be carried out in many practical situ…
At the Tritium Process Laboratory (TPL) at the Japan Atomic Energy Research Institute (JAERI), Caisson Assembly for Tritium Safety study (CATS) with 12 m3 of large airtight vessel (Caisson) was fabricated for confirmation and enhancement of fusion reactor safety to estimate tritium behavior in the case where a tritium…
The dissolution of metal during the passivation of Fe-Cr alloys has been studied in situ as a function of alloy composition in order to investigate the critical Cr content required for corrosion protection. This is achieved using synchrotron X-ray fluorescence microprobe analysis on a sputter-deposited Fe-Cr thin film…
The PBMR project should be seen against the background of the particular economic circumstances of Eskom, the project's dominant investor. On the one hand Eskom is one of the world's largest utilities by generation, with total capacity of almost 40 000 MWe, of which about 85% is coal-fired. South Africa's single nucle…
At relatively low electric fields the conduction of thin films (2–6 µm) of the discotic liquid crystal (HAT6–PTP9) sandwiched between ITO electrodes and homeotropically aligned is low and is consistent with space-charge limited behaviour. However when annealed at high temperatures and electric fields the films undergo…
Cyclic polarization measurements have been made on abraded Al in near neutral borate, chromate, phosphate, and sulfate solutions. In both borate and chromate solutions, the currents continued to decrease with each subsequent cycle due to oxide thickening. In contrast, a significant rate of oxide dissolution occurred t…
The decomposition behavior of titanium tetraisopropoxide [TTIP, on Si(100) has been studied using a thermal desorption technique in vacuum. TTIP is dissociated on Si(100) at temperatures below 350 K so that the silicon surface is covered with isopropoxy ligands and hydrogen, which originate from the TTIP. The isopropo…