Methylrhenium trioxide (MTO) was found to be a good catalyst for the oxidation of tertiary phosphines by molecular oxygen at room temperature. Evidence is given that an intermediate Re(V) compound — CH3ReO2, or the adduct CH3ReO2·OPPh3 — is involved. The deoxygenation of epoxides, sulfoxide...

Rhenium carboxylates of general formula Re2(O2CnH2n+1)Cl2 where n = 5–8, were studied as precursors for the photochemical deposition of rhenium trioxide thin films. Solutions of the inorganic complexes were spin coated on p-type silicon(1 0 0) substrates and the solid-state photochemistry studi...

The evolution and interaction of buried interfaces during the synthesis of lead zirconate titanate (PZT) ferroelectric thin film devices have been previously predicted by density functional theory modeling and observed experimentally via in–situ structural characterization. Moreover, the format...

In the current study, nanocomposites of bacterial cellulose (BC) and amorphous TiO2 were prepared and characterized. The nanocomposites were evaluated as adsorbent for the removal of lead (Pb) from aqueous solution. The different reactions conditions such as pH, equilibrium time, temperature, ad...

Scandium is often considered as immobile during chemical weathering, based on its low solubility. In contrast to other conservative (i.e. relatively immobile) elements incorporated into accessory minerals resistant to weathering (e.g. zirconium, thorium or niobium), the scarcity of scandium mine...

Scandium oxide films were deposited on fused silica substrates by reactive pulsed DC magnetron sputtering. The use of feed-back optical emission monitoring enabled high-rate reactive deposition of films with tunable stoichiometry and properties. The under-stoichiometric, stoichiometric and over-...

A direct method of obtaining (Pb4I4L2)n, where L is twice deprotonated 2,2′,2″-nitrilotriethanol (triethanolamine), is reported. The crystal structure of the compound was determined by X-ray techniques. The crystallographically independent fragments of Pb4I4L2 are associated by bridging oxygen...

The study of the mid-late first row transition metal co-ordination chemistry of the pyridazine-containing Schiff-base macrocycle L1 [derived from the (2 + 2) condensation of 3,6-diformylpyridazine and 1,3-diaminopropane] has been completed. Transmetallation reactions of [Pb2(4 + 4)](ClO4)4 (1) u...

The reaction of Pb2+ ions with 4-thiazolidinone-2-thione (Hrd) yields to coordination of the uncommon dilead unit (Pb22+) by the N-deprotonated molecule of the ligand. The powder structure determination of the complex reveals an almost planar dimeric structure with the {N,S} coordination mode. T...

RésuméUn nouvel oxyde double: Rb4Nb6O17·3H2O a été synthéthisé en monocristaux. Il cristallise dans le système orthorhombique, groupe spatial Pmnb avec a = 7,83(1), b = 39,06(5), c = 6,57(1)Å, Z = 4. La structure a été résolue par diffraction des rayons X à partir de 811 réflexions ...

A 197.2 THz (1520.2 nm) ITU-T grid distributed feedback (DFB) diode laser is frequency stabilized at 197.198 THz by 1ocking its second harmonic (SH) signal on the rubidium 5S1/2→7S1/2 two-photon transition at 394.396 THz (760.1 nm). With 100 mW from the DFB diode laser and amplifying by an erbi...

The 5S1/2 (F = 3)–5D5/2 (F = 5) two-photon transition of rubidium (85) at 778 nm is an excellent candidate for a high-quality portable frequency standard at the telecommunication region. The interrogation of the two-photon transition requires efficient second harmonic conversion of a laser at 1...

The lack of studies in the current literature about the assessment of alkaline niobates as catalysts for soot oxidation has motivated this research. In this study, the synthesis, characterization and assessment of alkaline metal niobates as catalysts for soot combustion are reported. The solids ...

Dense single-crystalline Ni2Si nanowires, Ni3Si2 nanowires and nanorods, and NiSi nanowires have been successfully synthesized in large-scale on the surface of Ni foam via a simple chemical vapor deposition of SiH4 at 450–600 °C. It is indicated that the reaction temperature and the flow rate ...

We have discovered stress-induced voiding in a Ni–Pt silicide line fabricated on a 45-nm-node logic device. The voiding led to the disconnection of a narrow silicide line between gates in a wide active area. In the device pattern, the silicide was strained by a shallow trench isolation structur...

For low cost high efficiency fully plated NiCu contacts on silicon solar cells, a thermal formation of nickel silicide is commonly performed for adhesion promotion. Since the results of this strategy have been found to be ambiguous, and as the interface situation is not understood, a microstruct...

Nanocrystalline neodymium titanium oxide thin films and powders with different phase compositions with mesoporous structure were produced by a straightforward particulate sol–gel route. The sols were prepared in various Nd:Ti molar ratios and they showed a narrow particle size distribution in t...

The main aim of this study is to investigate the impact of the steel substrate Nd-based chemical modification on the corrosion protection performance, cathodic delamination and adhesion properties of epoxy coating. The morphology, chemical composition, topography and chemistry of the treated sam...

Based on the determined breakthrough curves the affinity series Ln (III):iminodiacetic acid (IMDA)=1:2, pH 5.07–6.0 for most rare earth element complexes was found for the anion-exchanger Dowex 1×4 in the acetate and IMDA forms to be as follows: Dy (III)>Ho (III)>Gd (III)>Eu (III)>Er (III)>Y (...

There are many glass systems that have applications due to their advantages like high optical absorption, high ionic and electronic conductivities. In this work two groups of borosilicate titanate glass doped with one of rare earth oxides with composition in mol% 40 Na2B4O7-40 SiO2-(20–x) TiO2-...