SrAl2O4 monoclinic and Sr12Al14O33 cubic phase nanocrystals were synthesized using sol-gel route and their morphology verified with X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) to confirm the crystallinity of the samples and the crystallites nanoscale. Luminescence emissions we...

This study presents a novel approach to produce phosphorescent coatings on metal surfaces.Strontium aluminates are the most popular modern phosphorescent materials exhibiting long afterglow at room temperature and a broad spectral distribution of luminescence in the visible range. However, despi...

Currently Mineral Trioxide Aggregate (MTA) is extensively used in Endodontics for Root Canal Treatment. It mainly consists of Portland cement and radio-opacifier agent. In spite of being widely used with success, there are some concerns regarding its properties. The objective of this study was t...

The magnetic properties of 53 aluminium-rich intermetallic compounds R6T4Al43 with R=rare-earth elements and T=Ti, V, Nb, Ta, Cr, Mo, W were investigated using polycrystalline samples and a SQUID magnetometer in the temperature range from 2 to 300 K with magnetic flux densities up to 5.5 T. The ...

The Gd-Co-Al system has been investigated at 870/1070 K by X-ray and elemental EDS analyses. The existence of the known compounds Gd2Co3Al9 (Y2Co3Ga9-type), Gd3Co4.5Al11.5 (Gd3Co4.6Al11) (Gd3Ru4Al12-type), Gd3Co6–7.4Al3–1.6 (CeNi3-type), GdCo1.15–0.65Al0.85–1.35 (MgZn2-type), Gd2Co2Al (Mo2Ni...

The compound GdAgAl which crystallizes in the orthorhombic CeCu2-type structure was prepared. Spin glass behaviour was observed at low temperatures. At high temperatures, the magnetic susceptibility obeys the Curie–Weiss law. Disorder of the nonmagnetic atoms sublattice leads to high electrical...

The aluminum-rich intermetallic rare earth compounds RERh4Al15 (RE = La, Ce Pr, Sm, Gd) were synthesized by arc melting of the elements under an argon atmosphere. The samples were characterized by powder X-ray diffraction which revealed a straight-forward agreement of the synthesized materials w...

The SIBELIUS experiment was designed to obtain information on the compatibility between beryllium and ceramics, as well as beryllium and steel, in a neutron environment. This experiment comprised irradiation of eight capsules, seven of which were independently purged with a He/0.1% H2 gas mixtur...

Extraction of Be(II) and Al(III) from aqueous sulfate solution by CYANEX 921 (commercial trioctylphospine oxide) in kerosene was separately studied. The parameters affecting the extraction process, such as hydrogen ion, sulfate ion, and CYANEX 921 concentrations, and temperature were investigate...

The introduction of beryllium as a neutron multiplier in ceramic blankets of thermonuclear fusion reactors may give rise to the following compatibility problems: (i) oxidation of Be by ceramics (lithium aluminate and silicates) or by water vapour; (ii) interaction between beryllium and austeniti...

Tape casting is a process often used for the preparation of microelectronics substrates. The present work is a continuation of the first part where we have discussed the structural and microstructural characteristics of calcium aluminate cement tape. Indeed, in this second part, we focus on the ...

It was verified, by several methods, that the red inclusions in Cr3+-doped beryllium hexa-aluminate (BHA) crystals are inclusions of Al2O3:Cr3+. The reasons for their presence and the mechanism of their formation and elimination by use of an excess of BeO were interpreted in accordance with the ...

The UV spectra of sodium aluminate solutions were obtained in the sodium oxide concentration range from 59 to 409 g/L and the caustic ratio range from 1.5 to 4.0 to reveal the structure characteristics of them, It is found that a new peak appears at about 370 nm besides peaks at about 220 and 26...

Beryllium was oxidized at a current density of 10 mA cm−2 in a 0.5 M Na2CO3 (pH = 11.2) electrolyte to understand the micro-arc oxidation (MAO) process. Different oxidation stages were investigated by analysing the voltage–time responses and coating morphology. ‘Electric breakdown’ accompanie...

Eu-doped SrAl12O19, SrAl4O7, Sr4Al14O25 and SrAl2O4 bulk crystals were successfully synthesized by the floating zone method. The samples exhibit photoluminescence and scintillation with an intense broad emission due to the 5d-4f transitions of Eu2+ in the visible range, and Eu:SrAl12O19 shows ad...

Beryllium intermetallic compounds (beryllides) are well-known refractory and functional materials for fission and fusion applications, specifically as reflectors and multipliers. For advanced neutron multipliers, our research group has investigated many kinds of beryllides. Due to its nuclear pr...

The method of horizontally oriented (one-dimensional) crystallization (HOC) was applied for growth of chrome-doped beryllium aluminate (alexandrite) single crystals. The stratified hydrodynamic structure of melt in the boat-like crystallization container that predetermines major features of crys...

Lamellar γ-TiAl has a microstructure that spans multiple length scales: lamellar thickness (10 nm–1 μm), γ domain length (100 nm–10 μm) and colony size (100 μm–1 mm). Only by characterizing the deformation across the different scales can one understand how the microstructure influences p...

ObjectiveInvestigation of the replacement of bismuth oxide by zirconium oxide in mineral trioxide aggregate (MTA) and characterization and evaluation of the radiopacity and physical properties of varying replacements of zirconium oxide mixed at either water–powder or water–cement proportions o...

The electronic and geometrical structures of neutral and charged YOn (n=2–12) clusters have been investigated using density functional theory (DFT) with generalized gradient approximation. The oxygen atom in YOn has been found to be in oxo, peroxo and in superoxo forms. The geometrical structur...