Gallium arsenide (GaAs), indium arsenide (InAs), and aluminium gallium arsenide (AlGaAs) are semiconductor applications. Although the increased use of these materials has raised concerns about occupational exposure to them, there is little information regarding the adverse health effects to work...

The aim of this work was to screen and characterize heterotrophic bacteria for gallium arsenide (GaAs) leaching. Ga in the form of GaAs has been extensively used as a semiconductor substrate material. The advantage of using microbes for gallium recovery is the fact that this method is a safer, e...

96 new Wittig based Schiff-Base (WSB) ligands (both E & Z conformation) containing fused aromatic rings were designed and screened for NLO property. Wittig based precursor aldehydes were synthesized and spectroscopically confirmed. WSB ligands and their copper(II) complexes were also designed, o...

ZusammenfassungIn der Kristallstruktur von Ba5Cu1,9Al3,1 (R3m; a = 614,0(4) pm, c = 3728,1(9) pm, Z = 3) sind durch Bariumatome separierte Cu/Al-Kagomé-Netze ausgebildet. BaAg2,4Al2,6 (Cmcm; a = 1102,6(4) pm, b = 872,3(3) pm, c = 552,0(3) pm, Z = 4) kristallisiert als ternäre Variante des BaZn5...

γ-TiAl intermetallic alloys are presently considered an efficient structural material for advanced turbine blades and aero-engine components due to their various advantages compared to the traditionally used superalloys. However, their poor oxidation resistance at temperatures > 750 °C severel...

Hydrogen embrittlement is no doubt a limiting factor in the high performance applications of many intermetallics. This is mainly because of the inward diffusion of hydrogen atoms and formation of brittle hydride phases during hydrogen exposure of the intermetallic components that resulted in low...

The title compounds Ba3ZnHg10 and BaZn0.6Hg3.4 were synthesized from stoichiometric ratios of the elements in Ta crucibles. Their crystal structures, which both represent new structure types, have been determined using single crystal X-ray data. The structure of Ba3ZnHg10 (orthorhombic, oP28, sp...

A stable dispersion of iron aluminide (FeAl) intermetallic powders was achieved in water using ammonium salt of poly(methacrylic acid) (PMAA-NH4). The electrosteric stabilization was identified to be the prevailing mechanism. pH value correlates inversely with the amount of PMAA-NH4 adsorbed ont...

Thermally oxidized aluminides formed on Ni–Cr–Fe based Alloy 690 substrates were subjected to interaction with sodium borosilicate melt (used as matrices for immobilization of high-level radioactive liquid waste) at 1248 K for 192 h. The glass samples were analyzed by Fourier transform infrare...

Three aluminides of the series BaxAl5 (x=3,3.5,4) were synthesized from stoichiometric ratios of the elements in Ta crucibles. The crystal structure of the new compound Ba7Al10 was determined using single crystal X-ray data (space group R3¯m, a=604.23(9), c=4879.0(12)pm, Z=3, R1=0.0325). The co...

Titanium aluminides are excellent materials for light-weight applications at high temperatures. To enhance their creep strength, various alloying elements are added. In this work the effect of 5 at% Niobium (Nb), Tantalum (Ta) and Zirconium (Zr) on the creep properties of ternary Ti-44Al-5X (X =...

Composites of 12 mol% Ce-TZP and 30 vol% of alumina 12Ce-30A, strontium hexaaluminate 12Ce-30SA6 and lanthanum hexaaluminate 12 Ce-30LA6 were produced by a mixing and milling method, shaped by slip casting and subsequently sintered in air at 1500–1600 °C. The microstructure, phase composition ...

Nanocrystalline La0.8Sr0.2Al0.9Mn0.1O3 (LSAM) was synthesized by a microwave-assisted citrate method, and characterized by electron microscopy and X-ray diffraction. Electrical behavior of LSAM was investigated by impedance spectroscopy and activation energy of conduction was obtained. Joining o...

This paper describes a 3 × 1 surface reconstruction on the LAO (110) surface and its atomic structure analyzed from experimental electron diffraction data coupled with X-ray photoelectron spectroscopy analysis and reinforced by density functional theory calculations. We construct the multidimen...

We report observable segregation of strontium oxide at the surface of strontium lanthanum aluminate single-crystals annealed in oxidizing conditions. Electron microscopy imaging and energy-dispersive X-ray spectroscopy showed that Sr and O segregation occurs on strontium lanthanum aluminate surf...

Sm3+ doped disordered strontium hexa-aluminate crystals Sr1−xSmyLax−yMgxAl12−xO19 (x = 0.2, y = 0.05, 0.1, 0.15) were grown by Czochralski method. Polarized absorption spectra, as well as emission and lifetime measurements were performed. Strong absorption line located at 404 nm, could be utiliz...

Nd-doped strontium lanthanum aluminate crystals, Nd:ASL (Sr1−xNdyLax−yMgxAl12−xO19), with an extended composition parameter x (0.05 and 0.5) have been grown by the Czochralski pulling technique. Structural and compositional properties of the as-grown crystals have been studied using X-ray diffra...

An analysis of the high resolution spectra of the Pr3+ in strontium lanthanum aluminates, charge compensated with magnesium Sr1−xPryLax−yMgxAl12−xO19, (on a large composition range) is presented. The spectra are mainly dependent on the composition parameter x, and show more Pr3+ centers, two of ...

A series of novel lanthanum strontium aluminate phosphors, Ce3+-doped LaSr2AlO(5–0.5x)Fx(LSAF) phosphors were successfully synthesized using the high-temperature solid state synthesis procedure under reducing atmosphere (H2/N2=1/4). The X-ray diffraction pattern revealed that LSAF sample was a ...

Direct measuremens of orthoclase (001) were performed using in situ atomic force microscopy (AFM) and synchrotron X-ray reflectivity to reveal the Å-scale dissolution process as a function of pH and temperature. Distinct processes were observed, involving mainly terrace roughening at pH = 1.1 an...